drivers/scsi/arcmsr/arcmsr_hba.c - kernel/mindspeed - Git at Google

 /*
 *******************************************************************************
 **        O.S   : Linux
 **   FILE NAME  : arcmsr_hba.c
 **        BY    : Nick Cheng
 **   Description: SCSI RAID Device Driver for
 **                ARECA RAID Host adapter
 *******************************************************************************
 ** Copyright (C) 2002 - 2005, Areca Technology Corporation All rights reserved
 **
 **     Web site: www.areca.com.tw
 **       E-mail: support@areca.com.tw
 **
 ** This program is free software; you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License version 2 as
 ** published by the Free Software Foundation.
 ** This program is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ** GNU General Public License for more details.
 *******************************************************************************
 ** Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions
 ** are met:
 ** 1. Redistributions of source code must retain the above copyright
 **    notice, this list of conditions and the following disclaimer.
 ** 2. Redistributions in binary form must reproduce the above copyright
 **    notice, this list of conditions and the following disclaimer in the
 **    documentation and/or other materials provided with the distribution.
 ** 3. The name of the author may not be used to endorse or promote products
 **    derived from this software without specific prior written permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,BUT
 ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION)HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF
 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************
 ** For history of changes, see Documentation/scsi/ChangeLog.arcmsr
 **     Firmware Specification, see Documentation/scsi/arcmsr_spec.txt
 *******************************************************************************
 */
 #include <linux/module.h>
 #include <linux/reboot.h>
 #include <linux/spinlock.h>
 #include <linux/pci_ids.h>
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/timer.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
 #include <asm/dma.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsicam.h>
 #include "arcmsr.h"
 MODULE_AUTHOR("Nick Cheng <support@areca.com.tw>");
 MODULE_DESCRIPTION("ARECA (ARC11xx/12xx/16xx/1880) SATA/SAS RAID Host Bus Adapter");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(ARCMSR_DRIVER_VERSION);

 #define	ARCMSR_SLEEPTIME	10
 #define	ARCMSR_RETRYCOUNT	12

 wait_queue_head_t wait_q;
 static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
 					struct scsi_cmnd *cmd);
 static int arcmsr_iop_confirm(struct AdapterControlBlock *acb);
 static int arcmsr_abort(struct scsi_cmnd *);
 static int arcmsr_bus_reset(struct scsi_cmnd *);
 static int arcmsr_bios_param(struct scsi_device *sdev,
 		struct block_device *bdev, sector_t capacity, int *info);
 static int arcmsr_queue_command(struct Scsi_Host *h, struct scsi_cmnd *cmd);
 static int arcmsr_probe(struct pci_dev *pdev,
 				const struct pci_device_id *id);
 static void arcmsr_remove(struct pci_dev *pdev);
 static void arcmsr_shutdown(struct pci_dev *pdev);
 static void arcmsr_iop_init(struct AdapterControlBlock *acb);
 static void arcmsr_free_ccb_pool(struct AdapterControlBlock *acb);
 static u32 arcmsr_disable_outbound_ints(struct AdapterControlBlock *acb);
 static void arcmsr_stop_adapter_bgrb(struct AdapterControlBlock *acb);
 static void arcmsr_flush_hba_cache(struct AdapterControlBlock *acb);
 static void arcmsr_flush_hbb_cache(struct AdapterControlBlock *acb);
 static void arcmsr_request_device_map(unsigned long pacb);
 static void arcmsr_request_hba_device_map(struct AdapterControlBlock *acb);
 static void arcmsr_request_hbb_device_map(struct AdapterControlBlock *acb);
 static void arcmsr_request_hbc_device_map(struct AdapterControlBlock *acb);
 static void arcmsr_message_isr_bh_fn(struct work_struct *work);
 static bool arcmsr_get_firmware_spec(struct AdapterControlBlock *acb);
 static void arcmsr_start_adapter_bgrb(struct AdapterControlBlock *acb);
 static void arcmsr_hbc_message_isr(struct AdapterControlBlock *pACB);
 static void arcmsr_hardware_reset(struct AdapterControlBlock *acb);
 static const char *arcmsr_info(struct Scsi_Host *);
 static irqreturn_t arcmsr_interrupt(struct AdapterControlBlock *acb);
 static int arcmsr_adjust_disk_queue_depth(struct scsi_device *sdev,
 					  int queue_depth, int reason)
 {
 	if (reason != SCSI_QDEPTH_DEFAULT)
 		return -EOPNOTSUPP;

 	if (queue_depth > ARCMSR_MAX_CMD_PERLUN)
 		queue_depth = ARCMSR_MAX_CMD_PERLUN;
 	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
 	return queue_depth;
 }

 static struct scsi_host_template arcmsr_scsi_host_template = {
 	.module			= THIS_MODULE,
 	.name			= "ARCMSR ARECA SATA/SAS RAID Controller"
 				ARCMSR_DRIVER_VERSION,
 	.info			= arcmsr_info,
 	.queuecommand		= arcmsr_queue_command,
 	.eh_abort_handler		= arcmsr_abort,
 	.eh_bus_reset_handler	= arcmsr_bus_reset,
 	.bios_param		= arcmsr_bios_param,
 	.change_queue_depth	= arcmsr_adjust_disk_queue_depth,
 	.can_queue		= ARCMSR_MAX_FREECCB_NUM,
 	.this_id			= ARCMSR_SCSI_INITIATOR_ID,
 	.sg_tablesize	        	= ARCMSR_DEFAULT_SG_ENTRIES,
 	.max_sectors    	    	= ARCMSR_MAX_XFER_SECTORS_C,
 	.cmd_per_lun		= ARCMSR_MAX_CMD_PERLUN,
 	.use_clustering		= ENABLE_CLUSTERING,
 	.shost_attrs		= arcmsr_host_attrs,
 };
 static struct pci_device_id arcmsr_device_id_table[] = {
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1110)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1120)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1130)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1160)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1170)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1200)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1201)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1202)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1210)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1220)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1230)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1260)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1270)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1280)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1380)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1381)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1680)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1681)},
 	{PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1880)},
 	{0, 0}, /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(pci, arcmsr_device_id_table);
 static struct pci_driver arcmsr_pci_driver = {
 	.name			= "arcmsr",
 	.id_table			= arcmsr_device_id_table,
 	.probe			= arcmsr_probe,
 	.remove			= arcmsr_remove,
 	.shutdown		= arcmsr_shutdown,
 };
 /*
 ****************************************************************************
 ****************************************************************************
 */

 static void arcmsr_free_hbb_mu(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A:
 	case ACB_ADAPTER_TYPE_C:
 		break;
 	case ACB_ADAPTER_TYPE_B:{
 		dma_free_coherent(&acb->pdev->dev,
 			sizeof(struct MessageUnit_B),
 			acb->pmuB, acb->dma_coherent_handle_hbb_mu);
 	}
 	}
 }

 static bool arcmsr_remap_pciregion(struct AdapterControlBlock *acb)
 {
 	struct pci_dev *pdev = acb->pdev;
 	switch (acb->adapter_type){
 	case ACB_ADAPTER_TYPE_A:{
 		acb->pmuA = ioremap(pci_resource_start(pdev,0), pci_resource_len(pdev,0));
 		if (!acb->pmuA) {
 			printk(KERN_NOTICE "arcmsr%d: memory mapping region fail \n", acb->host->host_no);
 			return false;
 		}
 		break;
 	}
 	case ACB_ADAPTER_TYPE_B:{
 		void __iomem *mem_base0, *mem_base1;
 		mem_base0 = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 		if (!mem_base0) {
 			printk(KERN_NOTICE "arcmsr%d: memory mapping region fail \n", acb->host->host_no);
 			return false;
 		}
 		mem_base1 = ioremap(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2));
 		if (!mem_base1) {
 			iounmap(mem_base0);
 			printk(KERN_NOTICE "arcmsr%d: memory mapping region fail \n", acb->host->host_no);
 			return false;
 		}
 		acb->mem_base0 = mem_base0;
 		acb->mem_base1 = mem_base1;
 		break;
 	}
 	case ACB_ADAPTER_TYPE_C:{
 		acb->pmuC = ioremap_nocache(pci_resource_start(pdev, 1), pci_resource_len(pdev, 1));
 		if (!acb->pmuC) {
 			printk(KERN_NOTICE "arcmsr%d: memory mapping region fail \n", acb->host->host_no);
 			return false;
 		}
 		if (readl(&acb->pmuC->outbound_doorbell) & ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE) {
 			writel(ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE_DOORBELL_CLEAR, &acb->pmuC->outbound_doorbell_clear);/*clear interrupt*/
 			return true;
 		}
 		break;
 	}
 	}
 	return true;
 }

 static void arcmsr_unmap_pciregion(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A:{
 		iounmap(acb->pmuA);
 	}
 	break;
 	case ACB_ADAPTER_TYPE_B:{
 		iounmap(acb->mem_base0);
 		iounmap(acb->mem_base1);
 	}

 	break;
 	case ACB_ADAPTER_TYPE_C:{
 		iounmap(acb->pmuC);
 	}
 	}
 }

 static irqreturn_t arcmsr_do_interrupt(int irq, void *dev_id)
 {
 	irqreturn_t handle_state;
 	struct AdapterControlBlock *acb = dev_id;

 	handle_state = arcmsr_interrupt(acb);
 	return handle_state;
 }

 static int arcmsr_bios_param(struct scsi_device *sdev,
 		struct block_device *bdev, sector_t capacity, int *geom)
 {
 	int ret, heads, sectors, cylinders, total_capacity;
 	unsigned char *buffer;/* return copy of block device's partition table */

 	buffer = scsi_bios_ptable(bdev);
 	if (buffer) {
 		ret = scsi_partsize(buffer, capacity, &geom[2], &geom[0], &geom[1]);
 		kfree(buffer);
 		if (ret != -1)
 			return ret;
 	}
 	total_capacity = capacity;
 	heads = 64;
 	sectors = 32;
 	cylinders = total_capacity / (heads * sectors);
 	if (cylinders > 1024) {
 		heads = 255;
 		sectors = 63;
 		cylinders = total_capacity / (heads * sectors);
 	}
 	geom[0] = heads;
 	geom[1] = sectors;
 	geom[2] = cylinders;
 	return 0;
 }

 static void arcmsr_define_adapter_type(struct AdapterControlBlock *acb)
 {
 	struct pci_dev *pdev = acb->pdev;
 	u16 dev_id;
 	pci_read_config_word(pdev, PCI_DEVICE_ID, &dev_id);
 	acb->dev_id = dev_id;
 	switch (dev_id) {
 	case 0x1880: {
 		acb->adapter_type = ACB_ADAPTER_TYPE_C;
 		}
 		break;
 	case 0x1201: {
 		acb->adapter_type = ACB_ADAPTER_TYPE_B;
 		}
 		break;

 	default: acb->adapter_type = ACB_ADAPTER_TYPE_A;
 	}
 }

 static uint8_t arcmsr_hba_wait_msgint_ready(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	int i;

 	for (i = 0; i < 2000; i++) {
 		if (readl(&reg->outbound_intstatus) &
 				ARCMSR_MU_OUTBOUND_MESSAGE0_INT) {
 			writel(ARCMSR_MU_OUTBOUND_MESSAGE0_INT,
 				&reg->outbound_intstatus);
 			return true;
 		}
 		msleep(10);
 	} /* max 20 seconds */

 	return false;
 }

 static uint8_t arcmsr_hbb_wait_msgint_ready(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	int i;

 	for (i = 0; i < 2000; i++) {
 		if (readl(reg->iop2drv_doorbell)
 			& ARCMSR_IOP2DRV_MESSAGE_CMD_DONE) {
 			writel(ARCMSR_MESSAGE_INT_CLEAR_PATTERN,
 					reg->iop2drv_doorbell);
 			writel(ARCMSR_DRV2IOP_END_OF_INTERRUPT,
 					reg->drv2iop_doorbell);
 			return true;
 		}
 		msleep(10);
 	} /* max 20 seconds */

 	return false;
 }

 static uint8_t arcmsr_hbc_wait_msgint_ready(struct AdapterControlBlock *pACB)
 {
 	struct MessageUnit_C *phbcmu = (struct MessageUnit_C *)pACB->pmuC;
 	int i;

 	for (i = 0; i < 2000; i++) {
 		if (readl(&phbcmu->outbound_doorbell)
 				& ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE) {
 			writel(ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE_DOORBELL_CLEAR,
 				&phbcmu->outbound_doorbell_clear); /*clear interrupt*/
 			return true;
 		}
 		msleep(10);
 	} /* max 20 seconds */

 	return false;
 }

 static void arcmsr_flush_hba_cache(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	int retry_count = 30;
 	writel(ARCMSR_INBOUND_MESG0_FLUSH_CACHE, &reg->inbound_msgaddr0);
 	do {
 		if (arcmsr_hba_wait_msgint_ready(acb))
 			break;
 		else {
 			retry_count--;
 			printk(KERN_NOTICE "arcmsr%d: wait 'flush adapter cache' \
 			timeout, retry count down = %d \n", acb->host->host_no, retry_count);
 		}
 	} while (retry_count != 0);
 }

 static void arcmsr_flush_hbb_cache(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	int retry_count = 30;
 	writel(ARCMSR_MESSAGE_FLUSH_CACHE, reg->drv2iop_doorbell);
 	do {
 		if (arcmsr_hbb_wait_msgint_ready(acb))
 			break;
 		else {
 			retry_count--;
 			printk(KERN_NOTICE "arcmsr%d: wait 'flush adapter cache' \
 			timeout,retry count down = %d \n", acb->host->host_no, retry_count);
 		}
 	} while (retry_count != 0);
 }

 static void arcmsr_flush_hbc_cache(struct AdapterControlBlock *pACB)
 {
 	struct MessageUnit_C *reg = (struct MessageUnit_C *)pACB->pmuC;
 	int retry_count = 30;/* enlarge wait flush adapter cache time: 10 minute */
 	writel(ARCMSR_INBOUND_MESG0_FLUSH_CACHE, &reg->inbound_msgaddr0);
 	writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 	do {
 		if (arcmsr_hbc_wait_msgint_ready(pACB)) {
 			break;
 		} else {
 			retry_count--;
 			printk(KERN_NOTICE "arcmsr%d: wait 'flush adapter cache' \
 			timeout,retry count down = %d \n", pACB->host->host_no, retry_count);
 		}
 	} while (retry_count != 0);
 	return;
 }
 static void arcmsr_flush_adapter_cache(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		arcmsr_flush_hba_cache(acb);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		arcmsr_flush_hbb_cache(acb);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		arcmsr_flush_hbc_cache(acb);
 		}
 	}
 }

 static int arcmsr_alloc_ccb_pool(struct AdapterControlBlock *acb)
 {
 	struct pci_dev *pdev = acb->pdev;
 	void *dma_coherent;
 	dma_addr_t dma_coherent_handle;
 	struct CommandControlBlock *ccb_tmp;
 	int i = 0, j = 0;
 	dma_addr_t cdb_phyaddr;
 	unsigned long roundup_ccbsize;
 	unsigned long max_xfer_len;
 	unsigned long max_sg_entrys;
 	uint32_t  firm_config_version;

 	for (i = 0; i < ARCMSR_MAX_TARGETID; i++)
 		for (j = 0; j < ARCMSR_MAX_TARGETLUN; j++)
 			acb->devstate[i][j] = ARECA_RAID_GONE;

 	max_xfer_len = ARCMSR_MAX_XFER_LEN;
 	max_sg_entrys = ARCMSR_DEFAULT_SG_ENTRIES;
 	firm_config_version = acb->firm_cfg_version;
 	if((firm_config_version & 0xFF) >= 3){
 		max_xfer_len = (ARCMSR_CDB_SG_PAGE_LENGTH << ((firm_config_version >> 8) & 0xFF)) * 1024;/* max 4M byte */
 		max_sg_entrys = (max_xfer_len/4096);
 	}
 	acb->host->max_sectors = max_xfer_len/512;
 	acb->host->sg_tablesize = max_sg_entrys;
 	roundup_ccbsize = roundup(sizeof(struct CommandControlBlock) + (max_sg_entrys - 1) * sizeof(struct SG64ENTRY), 32);
 	acb->uncache_size = roundup_ccbsize * ARCMSR_MAX_FREECCB_NUM;
 	dma_coherent = dma_alloc_coherent(&pdev->dev, acb->uncache_size, &dma_coherent_handle, GFP_KERNEL);
 	if(!dma_coherent){
 		printk(KERN_NOTICE "arcmsr%d: dma_alloc_coherent got error\n", acb->host->host_no);
 		return -ENOMEM;
 	}
 	acb->dma_coherent = dma_coherent;
 	acb->dma_coherent_handle = dma_coherent_handle;
 	memset(dma_coherent, 0, acb->uncache_size);
 	ccb_tmp = dma_coherent;
 	acb->vir2phy_offset = (unsigned long)dma_coherent - (unsigned long)dma_coherent_handle;
 	for(i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++){
 		cdb_phyaddr = dma_coherent_handle + offsetof(struct CommandControlBlock, arcmsr_cdb);
 		ccb_tmp->cdb_phyaddr_pattern = ((acb->adapter_type == ACB_ADAPTER_TYPE_C) ? cdb_phyaddr : (cdb_phyaddr >> 5));
 		acb->pccb_pool[i] = ccb_tmp;
 		ccb_tmp->acb = acb;
 		INIT_LIST_HEAD(&ccb_tmp->list);
 		list_add_tail(&ccb_tmp->list, &acb->ccb_free_list);
 		ccb_tmp = (struct CommandControlBlock *)((unsigned long)ccb_tmp + roundup_ccbsize);
 		dma_coherent_handle = dma_coherent_handle + roundup_ccbsize;
 	}
 	return 0;
 }

 static void arcmsr_message_isr_bh_fn(struct work_struct *work)
 {
 	struct AdapterControlBlock *acb = container_of(work,struct AdapterControlBlock, arcmsr_do_message_isr_bh);
 	switch (acb->adapter_type) {
 		case ACB_ADAPTER_TYPE_A: {

 			struct MessageUnit_A __iomem *reg  = acb->pmuA;
 			char *acb_dev_map = (char *)acb->device_map;
 			uint32_t __iomem *signature = (uint32_t __iomem*) (&reg->message_rwbuffer[0]);
 			char __iomem *devicemap = (char __iomem*) (&reg->message_rwbuffer[21]);
 			int target, lun;
 			struct scsi_device *psdev;
 			char diff;

 			atomic_inc(&acb->rq_map_token);
 			if (readl(signature) == ARCMSR_SIGNATURE_GET_CONFIG) {
 				for(target = 0; target < ARCMSR_MAX_TARGETID -1; target++) {
 					diff = (*acb_dev_map)^readb(devicemap);
 					if (diff != 0) {
 						char temp;
 						*acb_dev_map = readb(devicemap);
 						temp =*acb_dev_map;
 						for(lun = 0; lun < ARCMSR_MAX_TARGETLUN; lun++) {
 							if((temp & 0x01)==1 && (diff & 0x01) == 1) {
 								scsi_add_device(acb->host, 0, target, lun);
 							}else if((temp & 0x01) == 0 && (diff & 0x01) == 1) {
 								psdev = scsi_device_lookup(acb->host, 0, target, lun);
 								if (psdev != NULL ) {
 									scsi_remove_device(psdev);
 									scsi_device_put(psdev);
 								}
 							}
 							temp >>= 1;
 							diff >>= 1;
 						}
 					}
 					devicemap++;
 					acb_dev_map++;
 				}
 			}
 			break;
 		}

 		case ACB_ADAPTER_TYPE_B: {
 			struct MessageUnit_B *reg  = acb->pmuB;
 			char *acb_dev_map = (char *)acb->device_map;
 			uint32_t __iomem *signature = (uint32_t __iomem*)(&reg->message_rwbuffer[0]);
 			char __iomem *devicemap = (char __iomem*)(&reg->message_rwbuffer[21]);
 			int target, lun;
 			struct scsi_device *psdev;
 			char diff;

 			atomic_inc(&acb->rq_map_token);
 			if (readl(signature) == ARCMSR_SIGNATURE_GET_CONFIG) {
 				for(target = 0; target < ARCMSR_MAX_TARGETID -1; target++) {
 					diff = (*acb_dev_map)^readb(devicemap);
 					if (diff != 0) {
 						char temp;
 						*acb_dev_map = readb(devicemap);
 						temp =*acb_dev_map;
 						for(lun = 0; lun < ARCMSR_MAX_TARGETLUN; lun++) {
 							if((temp & 0x01)==1 && (diff & 0x01) == 1) {
 								scsi_add_device(acb->host, 0, target, lun);
 							}else if((temp & 0x01) == 0 && (diff & 0x01) == 1) {
 								psdev = scsi_device_lookup(acb->host, 0, target, lun);
 								if (psdev != NULL ) {
 									scsi_remove_device(psdev);
 									scsi_device_put(psdev);
 								}
 							}
 							temp >>= 1;
 							diff >>= 1;
 						}
 					}
 					devicemap++;
 					acb_dev_map++;
 				}
 			}
 		}
 		break;
 		case ACB_ADAPTER_TYPE_C: {
 			struct MessageUnit_C *reg  = acb->pmuC;
 			char *acb_dev_map = (char *)acb->device_map;
 			uint32_t __iomem *signature = (uint32_t __iomem *)(&reg->msgcode_rwbuffer[0]);
 			char __iomem *devicemap = (char __iomem *)(&reg->msgcode_rwbuffer[21]);
 			int target, lun;
 			struct scsi_device *psdev;
 			char diff;

 			atomic_inc(&acb->rq_map_token);
 			if (readl(signature) == ARCMSR_SIGNATURE_GET_CONFIG) {
 				for (target = 0; target < ARCMSR_MAX_TARGETID - 1; target++) {
 					diff = (*acb_dev_map)^readb(devicemap);
 					if (diff != 0) {
 						char temp;
 						*acb_dev_map = readb(devicemap);
 						temp = *acb_dev_map;
 						for (lun = 0; lun < ARCMSR_MAX_TARGETLUN; lun++) {
 							if ((temp & 0x01) == 1 && (diff & 0x01) == 1) {
 								scsi_add_device(acb->host, 0, target, lun);
 							} else if ((temp & 0x01) == 0 && (diff & 0x01) == 1) {
 								psdev = scsi_device_lookup(acb->host, 0, target, lun);
 								if (psdev != NULL) {
 									scsi_remove_device(psdev);
 									scsi_device_put(psdev);
 								}
 							}
 							temp >>= 1;
 							diff >>= 1;
 						}
 					}
 					devicemap++;
 					acb_dev_map++;
 				}
 			}
 		}
 	}
 }

 static int arcmsr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct Scsi_Host *host;
 	struct AdapterControlBlock *acb;
 	uint8_t bus,dev_fun;
 	int error;
 	error = pci_enable_device(pdev);
 	if(error){
 		return -ENODEV;
 	}
 	host = scsi_host_alloc(&arcmsr_scsi_host_template, sizeof(struct AdapterControlBlock));
 	if(!host){
     		goto pci_disable_dev;
 	}
 	error = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 	if(error){
 		error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 		if(error){
 			printk(KERN_WARNING
 			       "scsi%d: No suitable DMA mask available\n",
 			       host->host_no);
 			goto scsi_host_release;
 		}
 	}
 	init_waitqueue_head(&wait_q);
 	bus = pdev->bus->number;
 	dev_fun = pdev->devfn;
 	acb = (struct AdapterControlBlock *) host->hostdata;
 	memset(acb,0,sizeof(struct AdapterControlBlock));
 	acb->pdev = pdev;
 	acb->host = host;
 	host->max_lun = ARCMSR_MAX_TARGETLUN;
 	host->max_id = ARCMSR_MAX_TARGETID;		/*16:8*/
 	host->max_cmd_len = 16;	 			/*this is issue of 64bit LBA ,over 2T byte*/
 	host->can_queue = ARCMSR_MAX_FREECCB_NUM;	/* max simultaneous cmds */
 	host->cmd_per_lun = ARCMSR_MAX_CMD_PERLUN;
 	host->this_id = ARCMSR_SCSI_INITIATOR_ID;
 	host->unique_id = (bus << 8) | dev_fun;
 	pci_set_drvdata(pdev, host);
 	pci_set_master(pdev);
 	error = pci_request_regions(pdev, "arcmsr");
 	if(error){
 		goto scsi_host_release;
 	}
 	spin_lock_init(&acb->eh_lock);
 	spin_lock_init(&acb->ccblist_lock);
 	acb->acb_flags |= (ACB_F_MESSAGE_WQBUFFER_CLEARED |
 			ACB_F_MESSAGE_RQBUFFER_CLEARED |
 			ACB_F_MESSAGE_WQBUFFER_READED);
 	acb->acb_flags &= ~ACB_F_SCSISTOPADAPTER;
 	INIT_LIST_HEAD(&acb->ccb_free_list);
 	arcmsr_define_adapter_type(acb);
 	error = arcmsr_remap_pciregion(acb);
 	if(!error){
 		goto pci_release_regs;
 	}
 	error = arcmsr_get_firmware_spec(acb);
 	if(!error){
 		goto unmap_pci_region;
 	}
 	error = arcmsr_alloc_ccb_pool(acb);
 	if(error){
 		goto free_hbb_mu;
 	}
 	arcmsr_iop_init(acb);
 	error = scsi_add_host(host, &pdev->dev);
 	if(error){
 		goto RAID_controller_stop;
 	}
 	error = request_irq(pdev->irq, arcmsr_do_interrupt, IRQF_SHARED, "arcmsr", acb);
 	if(error){
 		goto scsi_host_remove;
 	}
 	host->irq = pdev->irq;
     	scsi_scan_host(host);
 	INIT_WORK(&acb->arcmsr_do_message_isr_bh, arcmsr_message_isr_bh_fn);
 	atomic_set(&acb->rq_map_token, 16);
 	atomic_set(&acb->ante_token_value, 16);
 	acb->fw_flag = FW_NORMAL;
 	init_timer(&acb->eternal_timer);
 	acb->eternal_timer.expires = jiffies + msecs_to_jiffies(6 * HZ);
 	acb->eternal_timer.data = (unsigned long) acb;
 	acb->eternal_timer.function = &arcmsr_request_device_map;
 	add_timer(&acb->eternal_timer);
 	if(arcmsr_alloc_sysfs_attr(acb))
 		goto out_free_sysfs;
 	return 0;
 out_free_sysfs:
 scsi_host_remove:
 	scsi_remove_host(host);
 RAID_controller_stop:
 	arcmsr_stop_adapter_bgrb(acb);
 	arcmsr_flush_adapter_cache(acb);
 	arcmsr_free_ccb_pool(acb);
 free_hbb_mu:
 	arcmsr_free_hbb_mu(acb);
 unmap_pci_region:
 	arcmsr_unmap_pciregion(acb);
 pci_release_regs:
 	pci_release_regions(pdev);
 scsi_host_release:
 	scsi_host_put(host);
 pci_disable_dev:
 	pci_disable_device(pdev);
 	return -ENODEV;
 }

 static uint8_t arcmsr_abort_hba_allcmd(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	writel(ARCMSR_INBOUND_MESG0_ABORT_CMD, &reg->inbound_msgaddr0);
 	if (!arcmsr_hba_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'abort all outstanding command' timeout \n"
 			, acb->host->host_no);
 		return false;
 	}
 	return true;
 }

 static uint8_t arcmsr_abort_hbb_allcmd(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;

 	writel(ARCMSR_MESSAGE_ABORT_CMD, reg->drv2iop_doorbell);
 	if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'abort all outstanding command' timeout \n"
 			, acb->host->host_no);
 		return false;
 	}
 	return true;
 }
 static uint8_t arcmsr_abort_hbc_allcmd(struct AdapterControlBlock *pACB)
 {
 	struct MessageUnit_C *reg = (struct MessageUnit_C *)pACB->pmuC;
 	writel(ARCMSR_INBOUND_MESG0_ABORT_CMD, &reg->inbound_msgaddr0);
 	writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 	if (!arcmsr_hbc_wait_msgint_ready(pACB)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'abort all outstanding command' timeout \n"
 			, pACB->host->host_no);
 		return false;
 	}
 	return true;
 }
 static uint8_t arcmsr_abort_allcmd(struct AdapterControlBlock *acb)
 {
 	uint8_t rtnval = 0;
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		rtnval = arcmsr_abort_hba_allcmd(acb);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		rtnval = arcmsr_abort_hbb_allcmd(acb);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_C: {
 		rtnval = arcmsr_abort_hbc_allcmd(acb);
 		}
 	}
 	return rtnval;
 }

 static bool arcmsr_hbb_enable_driver_mode(struct AdapterControlBlock *pacb)
 {
 	struct MessageUnit_B *reg = pacb->pmuB;
 	writel(ARCMSR_MESSAGE_START_DRIVER_MODE, reg->drv2iop_doorbell);
 	if (!arcmsr_hbb_wait_msgint_ready(pacb)) {
 		printk(KERN_ERR "arcmsr%d: can't set driver mode. \n", pacb->host->host_no);
 		return false;
 	}
     	return true;
 }

 static void arcmsr_pci_unmap_dma(struct CommandControlBlock *ccb)
 {
 	struct scsi_cmnd *pcmd = ccb->pcmd;

 	scsi_dma_unmap(pcmd);
 }

 static void arcmsr_ccb_complete(struct CommandControlBlock *ccb)
 {
 	struct AdapterControlBlock *acb = ccb->acb;
 	struct scsi_cmnd *pcmd = ccb->pcmd;
 	unsigned long flags;
 	atomic_dec(&acb->ccboutstandingcount);
 	arcmsr_pci_unmap_dma(ccb);
 	ccb->startdone = ARCMSR_CCB_DONE;
 	spin_lock_irqsave(&acb->ccblist_lock, flags);
 	list_add_tail(&ccb->list, &acb->ccb_free_list);
 	spin_unlock_irqrestore(&acb->ccblist_lock, flags);
 	pcmd->scsi_done(pcmd);
 }

 static void arcmsr_report_sense_info(struct CommandControlBlock *ccb)
 {

 	struct scsi_cmnd *pcmd = ccb->pcmd;
 	struct SENSE_DATA *sensebuffer = (struct SENSE_DATA *)pcmd->sense_buffer;
 	pcmd->result = DID_OK << 16;
 	if (sensebuffer) {
 		int sense_data_length =
 			sizeof(struct SENSE_DATA) < SCSI_SENSE_BUFFERSIZE
 			? sizeof(struct SENSE_DATA) : SCSI_SENSE_BUFFERSIZE;
 		memset(sensebuffer, 0, SCSI_SENSE_BUFFERSIZE);
 		memcpy(sensebuffer, ccb->arcmsr_cdb.SenseData, sense_data_length);
 		sensebuffer->ErrorCode = SCSI_SENSE_CURRENT_ERRORS;
 		sensebuffer->Valid = 1;
 	}
 }

 static u32 arcmsr_disable_outbound_ints(struct AdapterControlBlock *acb)
 {
 	u32 orig_mask = 0;
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A : {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		orig_mask = readl(&reg->outbound_intmask);
 		writel(orig_mask|ARCMSR_MU_OUTBOUND_ALL_INTMASKENABLE, \
 						&reg->outbound_intmask);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_B : {
 		struct MessageUnit_B *reg = acb->pmuB;
 		orig_mask = readl(reg->iop2drv_doorbell_mask);
 		writel(0, reg->iop2drv_doorbell_mask);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C:{
 		struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
 		/* disable all outbound interrupt */
 		orig_mask = readl(&reg->host_int_mask); /* disable outbound message0 int */
 		writel(orig_mask|ARCMSR_HBCMU_ALL_INTMASKENABLE, &reg->host_int_mask);
 		}
 		break;
 	}
 	return orig_mask;
 }

 static void arcmsr_report_ccb_state(struct AdapterControlBlock *acb,
 			struct CommandControlBlock *ccb, bool error)
 {
 	uint8_t id, lun;
 	id = ccb->pcmd->device->id;
 	lun = ccb->pcmd->device->lun;
 	if (!error) {
 		if (acb->devstate[id][lun] == ARECA_RAID_GONE)
 			acb->devstate[id][lun] = ARECA_RAID_GOOD;
 		ccb->pcmd->result = DID_OK << 16;
 		arcmsr_ccb_complete(ccb);
 	}else{
 		switch (ccb->arcmsr_cdb.DeviceStatus) {
 		case ARCMSR_DEV_SELECT_TIMEOUT: {
 			acb->devstate[id][lun] = ARECA_RAID_GONE;
 			ccb->pcmd->result = DID_NO_CONNECT << 16;
 			arcmsr_ccb_complete(ccb);
 			}
 			break;

 		case ARCMSR_DEV_ABORTED:

 		case ARCMSR_DEV_INIT_FAIL: {
 			acb->devstate[id][lun] = ARECA_RAID_GONE;
 			ccb->pcmd->result = DID_BAD_TARGET << 16;
 			arcmsr_ccb_complete(ccb);
 			}
 			break;

 		case ARCMSR_DEV_CHECK_CONDITION: {
 			acb->devstate[id][lun] = ARECA_RAID_GOOD;
 			arcmsr_report_sense_info(ccb);
 			arcmsr_ccb_complete(ccb);
 			}
 			break;

 		default:
 			printk(KERN_NOTICE
 				"arcmsr%d: scsi id = %d lun = %d isr get command error done, \
 				but got unknown DeviceStatus = 0x%x \n"
 				, acb->host->host_no
 				, id
 				, lun
 				, ccb->arcmsr_cdb.DeviceStatus);
 				acb->devstate[id][lun] = ARECA_RAID_GONE;
 				ccb->pcmd->result = DID_NO_CONNECT << 16;
 				arcmsr_ccb_complete(ccb);
 			break;
 		}
 	}
 }

 static void arcmsr_drain_donequeue(struct AdapterControlBlock *acb, struct CommandControlBlock *pCCB, bool error)
 {
 	int id, lun;
 	if ((pCCB->acb != acb) || (pCCB->startdone != ARCMSR_CCB_START)) {
 		if (pCCB->startdone == ARCMSR_CCB_ABORTED) {
 			struct scsi_cmnd *abortcmd = pCCB->pcmd;
 			if (abortcmd) {
 				id = abortcmd->device->id;
 				lun = abortcmd->device->lun;
 				abortcmd->result |= DID_ABORT << 16;
 				arcmsr_ccb_complete(pCCB);
 				printk(KERN_NOTICE "arcmsr%d: pCCB ='0x%p' isr got aborted command \n",
 				acb->host->host_no, pCCB);
 			}
 			return;
 		}
 		printk(KERN_NOTICE "arcmsr%d: isr get an illegal ccb command \
 				done acb = '0x%p'"
 				"ccb = '0x%p' ccbacb = '0x%p' startdone = 0x%x"
 				" ccboutstandingcount = %d \n"
 				, acb->host->host_no
 				, acb
 				, pCCB
 				, pCCB->acb
 				, pCCB->startdone
 				, atomic_read(&acb->ccboutstandingcount));
 		  return;
 	}
 	arcmsr_report_ccb_state(acb, pCCB, error);
 }

 static void arcmsr_done4abort_postqueue(struct AdapterControlBlock *acb)
 {
 	int i = 0;
 	uint32_t flag_ccb;
 	struct ARCMSR_CDB *pARCMSR_CDB;
 	bool error;
 	struct CommandControlBlock *pCCB;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		uint32_t outbound_intstatus;
 		outbound_intstatus = readl(&reg->outbound_intstatus) &
 					acb->outbound_int_enable;
 		/*clear and abort all outbound posted Q*/
 		writel(outbound_intstatus, &reg->outbound_intstatus);/*clear interrupt*/
 		while(((flag_ccb = readl(&reg->outbound_queueport)) != 0xFFFFFFFF)
 				&& (i++ < ARCMSR_MAX_OUTSTANDING_CMD)) {
 			pARCMSR_CDB = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));/*frame must be 32 bytes aligned*/
 			pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
 			error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 			arcmsr_drain_donequeue(acb, pCCB, error);
 		}
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		/*clear all outbound posted Q*/
 		writel(ARCMSR_DOORBELL_INT_CLEAR_PATTERN, reg->iop2drv_doorbell); /* clear doorbell interrupt */
 		for (i = 0; i < ARCMSR_MAX_HBB_POSTQUEUE; i++) {
 			if ((flag_ccb = readl(&reg->done_qbuffer[i])) != 0) {
 				writel(0, &reg->done_qbuffer[i]);
 				pARCMSR_CDB = (struct ARCMSR_CDB *)(acb->vir2phy_offset+(flag_ccb << 5));/*frame must be 32 bytes aligned*/
 				pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
 				error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 				arcmsr_drain_donequeue(acb, pCCB, error);
 			}
 			reg->post_qbuffer[i] = 0;
 		}
 		reg->doneq_index = 0;
 		reg->postq_index = 0;
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *reg = acb->pmuC;
 		struct  ARCMSR_CDB *pARCMSR_CDB;
 		uint32_t flag_ccb, ccb_cdb_phy;
 		bool error;
 		struct CommandControlBlock *pCCB;
 		while ((readl(&reg->host_int_status) & ARCMSR_HBCMU_OUTBOUND_POSTQUEUE_ISR) && (i++ < ARCMSR_MAX_OUTSTANDING_CMD)) {
 			/*need to do*/
 			flag_ccb = readl(&reg->outbound_queueport_low);
 			ccb_cdb_phy = (flag_ccb & 0xFFFFFFF0);
 			pARCMSR_CDB = (struct  ARCMSR_CDB *)(acb->vir2phy_offset+ccb_cdb_phy);/*frame must be 32 bytes aligned*/
 			pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
 			error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1) ? true : false;
 			arcmsr_drain_donequeue(acb, pCCB, error);
 		}
 	}
 	}
 }
 static void arcmsr_remove(struct pci_dev *pdev)
 {
 	struct Scsi_Host *host = pci_get_drvdata(pdev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	int poll_count = 0;
 	arcmsr_free_sysfs_attr(acb);
 	scsi_remove_host(host);
 	flush_work_sync(&acb->arcmsr_do_message_isr_bh);
 	del_timer_sync(&acb->eternal_timer);
 	arcmsr_disable_outbound_ints(acb);
 	arcmsr_stop_adapter_bgrb(acb);
 	arcmsr_flush_adapter_cache(acb);
 	acb->acb_flags |= ACB_F_SCSISTOPADAPTER;
 	acb->acb_flags &= ~ACB_F_IOP_INITED;

 	for (poll_count = 0; poll_count < ARCMSR_MAX_OUTSTANDING_CMD; poll_count++){
 		if (!atomic_read(&acb->ccboutstandingcount))
 			break;
 		arcmsr_interrupt(acb);/* FIXME: need spinlock */
 		msleep(25);
 	}

 	if (atomic_read(&acb->ccboutstandingcount)) {
 		int i;

 		arcmsr_abort_allcmd(acb);
 		arcmsr_done4abort_postqueue(acb);
 		for (i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++) {
 			struct CommandControlBlock *ccb = acb->pccb_pool[i];
 			if (ccb->startdone == ARCMSR_CCB_START) {
 				ccb->startdone = ARCMSR_CCB_ABORTED;
 				ccb->pcmd->result = DID_ABORT << 16;
 				arcmsr_ccb_complete(ccb);
 			}
 		}
 	}
 	free_irq(pdev->irq, acb);
 	arcmsr_free_ccb_pool(acb);
 	arcmsr_free_hbb_mu(acb);
 	arcmsr_unmap_pciregion(acb);
 	pci_release_regions(pdev);
 	scsi_host_put(host);
 	pci_disable_device(pdev);
 	pci_set_drvdata(pdev, NULL);
 }

 static void arcmsr_shutdown(struct pci_dev *pdev)
 {
 	struct Scsi_Host *host = pci_get_drvdata(pdev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *)host->hostdata;
 	del_timer_sync(&acb->eternal_timer);
 	arcmsr_disable_outbound_ints(acb);
 	flush_work_sync(&acb->arcmsr_do_message_isr_bh);
 	arcmsr_stop_adapter_bgrb(acb);
 	arcmsr_flush_adapter_cache(acb);
 }

 static int arcmsr_module_init(void)
 {
 	int error = 0;
 	error = pci_register_driver(&arcmsr_pci_driver);
 	return error;
 }

 static void arcmsr_module_exit(void)
 {
 	pci_unregister_driver(&arcmsr_pci_driver);
 }
 module_init(arcmsr_module_init);
 module_exit(arcmsr_module_exit);

 static void arcmsr_enable_outbound_ints(struct AdapterControlBlock *acb,
 						u32 intmask_org)
 {
 	u32 mask;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		mask = intmask_org & ~(ARCMSR_MU_OUTBOUND_POSTQUEUE_INTMASKENABLE |
 			     ARCMSR_MU_OUTBOUND_DOORBELL_INTMASKENABLE|
 			     ARCMSR_MU_OUTBOUND_MESSAGE0_INTMASKENABLE);
 		writel(mask, &reg->outbound_intmask);
 		acb->outbound_int_enable = ~(intmask_org & mask) & 0x000000ff;
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		mask = intmask_org | (ARCMSR_IOP2DRV_DATA_WRITE_OK |
 			ARCMSR_IOP2DRV_DATA_READ_OK |
 			ARCMSR_IOP2DRV_CDB_DONE |
 			ARCMSR_IOP2DRV_MESSAGE_CMD_DONE);
 		writel(mask, reg->iop2drv_doorbell_mask);
 		acb->outbound_int_enable = (intmask_org | mask) & 0x0000000f;
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *reg = acb->pmuC;
 		mask = ~(ARCMSR_HBCMU_UTILITY_A_ISR_MASK | ARCMSR_HBCMU_OUTBOUND_DOORBELL_ISR_MASK|ARCMSR_HBCMU_OUTBOUND_POSTQUEUE_ISR_MASK);
 		writel(intmask_org & mask, &reg->host_int_mask);
 		acb->outbound_int_enable = ~(intmask_org & mask) & 0x0000000f;
 		}
 	}
 }

 static int arcmsr_build_ccb(struct AdapterControlBlock *acb,
 	struct CommandControlBlock *ccb, struct scsi_cmnd *pcmd)
 {
 	struct ARCMSR_CDB *arcmsr_cdb = (struct ARCMSR_CDB *)&ccb->arcmsr_cdb;
 	int8_t *psge = (int8_t *)&arcmsr_cdb->u;
 	__le32 address_lo, address_hi;
 	int arccdbsize = 0x30;
 	__le32 length = 0;
 	int i;
 	struct scatterlist *sg;
 	int nseg;
 	ccb->pcmd = pcmd;
 	memset(arcmsr_cdb, 0, sizeof(struct ARCMSR_CDB));
 	arcmsr_cdb->TargetID = pcmd->device->id;
 	arcmsr_cdb->LUN = pcmd->device->lun;
 	arcmsr_cdb->Function = 1;
 	arcmsr_cdb->Context = 0;
 	memcpy(arcmsr_cdb->Cdb, pcmd->cmnd, pcmd->cmd_len);

 	nseg = scsi_dma_map(pcmd);
 	if (unlikely(nseg > acb->host->sg_tablesize || nseg < 0))
 		return FAILED;
 	scsi_for_each_sg(pcmd, sg, nseg, i) {
 		/* Get the physical address of the current data pointer */
 		length = cpu_to_le32(sg_dma_len(sg));
 		address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sg)));
 		address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sg)));
 		if (address_hi == 0) {
 			struct SG32ENTRY *pdma_sg = (struct SG32ENTRY *)psge;

 			pdma_sg->address = address_lo;
 			pdma_sg->length = length;
 			psge += sizeof (struct SG32ENTRY);
 			arccdbsize += sizeof (struct SG32ENTRY);
 		} else {
 			struct SG64ENTRY *pdma_sg = (struct SG64ENTRY *)psge;

 			pdma_sg->addresshigh = address_hi;
 			pdma_sg->address = address_lo;
 			pdma_sg->length = length|cpu_to_le32(IS_SG64_ADDR);
 			psge += sizeof (struct SG64ENTRY);
 			arccdbsize += sizeof (struct SG64ENTRY);
 		}
 	}
 	arcmsr_cdb->sgcount = (uint8_t)nseg;
 	arcmsr_cdb->DataLength = scsi_bufflen(pcmd);
 	arcmsr_cdb->msgPages = arccdbsize/0x100 + (arccdbsize % 0x100 ? 1 : 0);
 	if ( arccdbsize > 256)
 		arcmsr_cdb->Flags |= ARCMSR_CDB_FLAG_SGL_BSIZE;
 	if (pcmd->sc_data_direction == DMA_TO_DEVICE)
 		arcmsr_cdb->Flags |= ARCMSR_CDB_FLAG_WRITE;
 	ccb->arc_cdb_size = arccdbsize;
 	return SUCCESS;
 }

 static void arcmsr_post_ccb(struct AdapterControlBlock *acb, struct CommandControlBlock *ccb)
 {
 	uint32_t cdb_phyaddr_pattern = ccb->cdb_phyaddr_pattern;
 	struct ARCMSR_CDB *arcmsr_cdb = (struct ARCMSR_CDB *)&ccb->arcmsr_cdb;
 	atomic_inc(&acb->ccboutstandingcount);
 	ccb->startdone = ARCMSR_CCB_START;
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;

 		if (arcmsr_cdb->Flags & ARCMSR_CDB_FLAG_SGL_BSIZE)
 			writel(cdb_phyaddr_pattern | ARCMSR_CCBPOST_FLAG_SGL_BSIZE,
 			&reg->inbound_queueport);
 		else {
 				writel(cdb_phyaddr_pattern, &reg->inbound_queueport);
 		}
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		uint32_t ending_index, index = reg->postq_index;

 		ending_index = ((index + 1) % ARCMSR_MAX_HBB_POSTQUEUE);
 		writel(0, &reg->post_qbuffer[ending_index]);
 		if (arcmsr_cdb->Flags & ARCMSR_CDB_FLAG_SGL_BSIZE) {
 			writel(cdb_phyaddr_pattern | ARCMSR_CCBPOST_FLAG_SGL_BSIZE,\
 						 &reg->post_qbuffer[index]);
 		} else {
 			writel(cdb_phyaddr_pattern, &reg->post_qbuffer[index]);
 		}
 		index++;
 		index %= ARCMSR_MAX_HBB_POSTQUEUE;/*if last index number set it to 0 */
 		reg->postq_index = index;
 		writel(ARCMSR_DRV2IOP_CDB_POSTED, reg->drv2iop_doorbell);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *phbcmu = (struct MessageUnit_C *)acb->pmuC;
 		uint32_t ccb_post_stamp, arc_cdb_size;

 		arc_cdb_size = (ccb->arc_cdb_size > 0x300) ? 0x300 : ccb->arc_cdb_size;
 		ccb_post_stamp = (cdb_phyaddr_pattern | ((arc_cdb_size - 1) >> 6) | 1);
 		if (acb->cdb_phyaddr_hi32) {
 			writel(acb->cdb_phyaddr_hi32, &phbcmu->inbound_queueport_high);
 			writel(ccb_post_stamp, &phbcmu->inbound_queueport_low);
 		} else {
 			writel(ccb_post_stamp, &phbcmu->inbound_queueport_low);
 		}
 		}
 	}
 }

 static void arcmsr_stop_hba_bgrb(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	acb->acb_flags &= ~ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_INBOUND_MESG0_STOP_BGRB, &reg->inbound_msgaddr0);
 	if (!arcmsr_hba_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'stop adapter background rebulid' timeout \n"
 			, acb->host->host_no);
 	}
 }

 static void arcmsr_stop_hbb_bgrb(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	acb->acb_flags &= ~ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_MESSAGE_STOP_BGRB, reg->drv2iop_doorbell);

 	if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'stop adapter background rebulid' timeout \n"
 			, acb->host->host_no);
 	}
 }

 static void arcmsr_stop_hbc_bgrb(struct AdapterControlBlock *pACB)
 {
 	struct MessageUnit_C *reg = (struct MessageUnit_C *)pACB->pmuC;
 	pACB->acb_flags &= ~ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_INBOUND_MESG0_STOP_BGRB, &reg->inbound_msgaddr0);
 	writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 	if (!arcmsr_hbc_wait_msgint_ready(pACB)) {
 		printk(KERN_NOTICE
 			"arcmsr%d: wait 'stop adapter background rebulid' timeout \n"
 			, pACB->host->host_no);
 	}
 	return;
 }
 static void arcmsr_stop_adapter_bgrb(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		arcmsr_stop_hba_bgrb(acb);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		arcmsr_stop_hbb_bgrb(acb);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		arcmsr_stop_hbc_bgrb(acb);
 		}
 	}
 }

 static void arcmsr_free_ccb_pool(struct AdapterControlBlock *acb)
 {
 	dma_free_coherent(&acb->pdev->dev, acb->uncache_size, acb->dma_coherent, acb->dma_coherent_handle);
 }

 void arcmsr_iop_message_read(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK, &reg->inbound_doorbell);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		writel(ARCMSR_DRV2IOP_DATA_READ_OK, reg->drv2iop_doorbell);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C __iomem *reg = acb->pmuC;
 		writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);
 		}
 	}
 }

 static void arcmsr_iop_message_wrote(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		/*
 		** push inbound doorbell tell iop, driver data write ok
 		** and wait reply on next hwinterrupt for next Qbuffer post
 		*/
 		writel(ARCMSR_INBOUND_DRIVER_DATA_WRITE_OK, &reg->inbound_doorbell);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		/*
 		** push inbound doorbell tell iop, driver data write ok
 		** and wait reply on next hwinterrupt for next Qbuffer post
 		*/
 		writel(ARCMSR_DRV2IOP_DATA_WRITE_OK, reg->drv2iop_doorbell);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C __iomem *reg = acb->pmuC;
 		/*
 		** push inbound doorbell tell iop, driver data write ok
 		** and wait reply on next hwinterrupt for next Qbuffer post
 		*/
 		writel(ARCMSR_HBCMU_DRV2IOP_DATA_WRITE_OK, &reg->inbound_doorbell);
 		}
 		break;
 	}
 }

 struct QBUFFER __iomem *arcmsr_get_iop_rqbuffer(struct AdapterControlBlock *acb)
 {
 	struct QBUFFER __iomem *qbuffer = NULL;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		qbuffer = (struct QBUFFER __iomem *)&reg->message_rbuffer;
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		qbuffer = (struct QBUFFER __iomem *)reg->message_rbuffer;
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *phbcmu = (struct MessageUnit_C *)acb->pmuC;
 		qbuffer = (struct QBUFFER __iomem *)&phbcmu->message_rbuffer;
 		}
 	}
 	return qbuffer;
 }

 static struct QBUFFER __iomem *arcmsr_get_iop_wqbuffer(struct AdapterControlBlock *acb)
 {
 	struct QBUFFER __iomem *pqbuffer = NULL;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		pqbuffer = (struct QBUFFER __iomem *) &reg->message_wbuffer;
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B  *reg = acb->pmuB;
 		pqbuffer = (struct QBUFFER __iomem *)reg->message_wbuffer;
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
 		pqbuffer = (struct QBUFFER __iomem *)&reg->message_wbuffer;
 	}

 	}
 	return pqbuffer;
 }

 static void arcmsr_iop2drv_data_wrote_handle(struct AdapterControlBlock *acb)
 {
 	struct QBUFFER __iomem *prbuffer;
 	struct QBUFFER *pQbuffer;
 	uint8_t __iomem *iop_data;
 	int32_t my_empty_len, iop_len, rqbuf_firstindex, rqbuf_lastindex;
 	rqbuf_lastindex = acb->rqbuf_lastindex;
 	rqbuf_firstindex = acb->rqbuf_firstindex;
 	prbuffer = arcmsr_get_iop_rqbuffer(acb);
 	iop_data = (uint8_t __iomem *)prbuffer->data;
 	iop_len = prbuffer->data_len;
 	my_empty_len = (rqbuf_firstindex - rqbuf_lastindex - 1) & (ARCMSR_MAX_QBUFFER - 1);

 	if (my_empty_len >= iop_len)
 	{
 		while (iop_len > 0) {
 			pQbuffer = (struct QBUFFER *)&acb->rqbuffer[rqbuf_lastindex];
 			memcpy(pQbuffer, iop_data, 1);
 			rqbuf_lastindex++;
 			rqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
 			iop_data++;
 			iop_len--;
 		}
 		acb->rqbuf_lastindex = rqbuf_lastindex;
 		arcmsr_iop_message_read(acb);
 	}

 	else {
 		acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW;
 	}
 }

 static void arcmsr_iop2drv_data_read_handle(struct AdapterControlBlock *acb)
 {
 	acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_READED;
 	if (acb->wqbuf_firstindex != acb->wqbuf_lastindex) {
 		uint8_t *pQbuffer;
 		struct QBUFFER __iomem *pwbuffer;
 		uint8_t __iomem *iop_data;
 		int32_t allxfer_len = 0;

 		acb->acb_flags &= (~ACB_F_MESSAGE_WQBUFFER_READED);
 		pwbuffer = arcmsr_get_iop_wqbuffer(acb);
 		iop_data = (uint8_t __iomem *)pwbuffer->data;

 		while ((acb->wqbuf_firstindex != acb->wqbuf_lastindex) && \
 							(allxfer_len < 124)) {
 			pQbuffer = &acb->wqbuffer[acb->wqbuf_firstindex];
 			memcpy(iop_data, pQbuffer, 1);
 			acb->wqbuf_firstindex++;
 			acb->wqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
 			iop_data++;
 			allxfer_len++;
 		}
 		pwbuffer->data_len = allxfer_len;

 		arcmsr_iop_message_wrote(acb);
 	}

 	if (acb->wqbuf_firstindex == acb->wqbuf_lastindex) {
 		acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_CLEARED;
 	}
 }

 static void arcmsr_hba_doorbell_isr(struct AdapterControlBlock *acb)
 {
 	uint32_t outbound_doorbell;
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	outbound_doorbell = readl(&reg->outbound_doorbell);
 	writel(outbound_doorbell, &reg->outbound_doorbell);
 	if (outbound_doorbell & ARCMSR_OUTBOUND_IOP331_DATA_WRITE_OK) {
 		arcmsr_iop2drv_data_wrote_handle(acb);
 	}

 	if (outbound_doorbell & ARCMSR_OUTBOUND_IOP331_DATA_READ_OK) {
 		arcmsr_iop2drv_data_read_handle(acb);
 	}
 }
 static void arcmsr_hbc_doorbell_isr(struct AdapterControlBlock *pACB)
 {
 	uint32_t outbound_doorbell;
 	struct MessageUnit_C *reg = (struct MessageUnit_C *)pACB->pmuC;
 	/*
 	*******************************************************************
 	**  Maybe here we need to check wrqbuffer_lock is lock or not
 	**  DOORBELL: din! don!
 	**  check if there are any mail need to pack from firmware
 	*******************************************************************
 	*/
 	outbound_doorbell = readl(&reg->outbound_doorbell);
 	writel(outbound_doorbell, &reg->outbound_doorbell_clear);/*clear interrupt*/
 	if (outbound_doorbell & ARCMSR_HBCMU_IOP2DRV_DATA_WRITE_OK) {
 		arcmsr_iop2drv_data_wrote_handle(pACB);
 	}
 	if (outbound_doorbell & ARCMSR_HBCMU_IOP2DRV_DATA_READ_OK) {
 		arcmsr_iop2drv_data_read_handle(pACB);
 	}
 	if (outbound_doorbell & ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE) {
 		arcmsr_hbc_message_isr(pACB);    /* messenger of "driver to iop commands" */
 	}
 	return;
 }
 static void arcmsr_hba_postqueue_isr(struct AdapterControlBlock *acb)
 {
 	uint32_t flag_ccb;
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	struct ARCMSR_CDB *pARCMSR_CDB;
 	struct CommandControlBlock *pCCB;
 	bool error;
 	while ((flag_ccb = readl(&reg->outbound_queueport)) != 0xFFFFFFFF) {
 		pARCMSR_CDB = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));/*frame must be 32 bytes aligned*/
 		pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 		arcmsr_drain_donequeue(acb, pCCB, error);
 	}
 }
 static void arcmsr_hbb_postqueue_isr(struct AdapterControlBlock *acb)
 {
 	uint32_t index;
 	uint32_t flag_ccb;
 	struct MessageUnit_B *reg = acb->pmuB;
 	struct ARCMSR_CDB *pARCMSR_CDB;
 	struct CommandControlBlock *pCCB;
 	bool error;
 	index = reg->doneq_index;
 	while ((flag_ccb = readl(&reg->done_qbuffer[index])) != 0) {
 		writel(0, &reg->done_qbuffer[index]);
 		pARCMSR_CDB = (struct ARCMSR_CDB *)(acb->vir2phy_offset+(flag_ccb << 5));/*frame must be 32 bytes aligned*/
 		pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 		arcmsr_drain_donequeue(acb, pCCB, error);
 		index++;
 		index %= ARCMSR_MAX_HBB_POSTQUEUE;
 		reg->doneq_index = index;
 	}
 }

 static void arcmsr_hbc_postqueue_isr(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_C *phbcmu;
 	struct ARCMSR_CDB *arcmsr_cdb;
 	struct CommandControlBlock *ccb;
 	uint32_t flag_ccb, ccb_cdb_phy, throttling = 0;
 	int error;

 	phbcmu = (struct MessageUnit_C *)acb->pmuC;
 	/* areca cdb command done */
 	/* Use correct offset and size for syncing */

 	while (readl(&phbcmu->host_int_status) &
 	ARCMSR_HBCMU_OUTBOUND_POSTQUEUE_ISR){
 	/* check if command done with no error*/
 	flag_ccb = readl(&phbcmu->outbound_queueport_low);
 	ccb_cdb_phy = (flag_ccb & 0xFFFFFFF0);/*frame must be 32 bytes aligned*/
 	arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset + ccb_cdb_phy);
 	ccb = container_of(arcmsr_cdb, struct CommandControlBlock, arcmsr_cdb);
 	error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1) ? true : false;
 	/* check if command done with no error */
 	arcmsr_drain_donequeue(acb, ccb, error);
 	if (throttling == ARCMSR_HBC_ISR_THROTTLING_LEVEL) {
 		writel(ARCMSR_HBCMU_DRV2IOP_POSTQUEUE_THROTTLING, &phbcmu->inbound_doorbell);
 		break;
 	}
 	throttling++;
 	}
 }
 /*
 **********************************************************************************
 ** Handle a message interrupt
 **
 ** The only message interrupt we expect is in response to a query for the current adapter config.
 ** We want this in order to compare the drivemap so that we can detect newly-attached drives.
 **********************************************************************************
 */
 static void arcmsr_hba_message_isr(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A *reg  = acb->pmuA;
 	/*clear interrupt and message state*/
 	writel(ARCMSR_MU_OUTBOUND_MESSAGE0_INT, &reg->outbound_intstatus);
 	schedule_work(&acb->arcmsr_do_message_isr_bh);
 }
 static void arcmsr_hbb_message_isr(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg  = acb->pmuB;

 	/*clear interrupt and message state*/
 	writel(ARCMSR_MESSAGE_INT_CLEAR_PATTERN, reg->iop2drv_doorbell);
 	schedule_work(&acb->arcmsr_do_message_isr_bh);
 }
 /*
 **********************************************************************************
 ** Handle a message interrupt
 **
 ** The only message interrupt we expect is in response to a query for the
 ** current adapter config.
 ** We want this in order to compare the drivemap so that we can detect newly-attached drives.
 **********************************************************************************
 */
 static void arcmsr_hbc_message_isr(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_C *reg  = acb->pmuC;
 	/*clear interrupt and message state*/
 	writel(ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE_DOORBELL_CLEAR, &reg->outbound_doorbell_clear);
 	schedule_work(&acb->arcmsr_do_message_isr_bh);
 }

 static int arcmsr_handle_hba_isr(struct AdapterControlBlock *acb)
 {
 	uint32_t outbound_intstatus;
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	outbound_intstatus = readl(&reg->outbound_intstatus) &
 		acb->outbound_int_enable;
 	if (!(outbound_intstatus & ARCMSR_MU_OUTBOUND_HANDLE_INT))	{
 		return 1;
 	}
 	writel(outbound_intstatus, &reg->outbound_intstatus);
 	if (outbound_intstatus & ARCMSR_MU_OUTBOUND_DOORBELL_INT)	{
 		arcmsr_hba_doorbell_isr(acb);
 	}
 	if (outbound_intstatus & ARCMSR_MU_OUTBOUND_POSTQUEUE_INT) {
 		arcmsr_hba_postqueue_isr(acb);
 	}
 	if(outbound_intstatus & ARCMSR_MU_OUTBOUND_MESSAGE0_INT) 	{
 		/* messenger of "driver to iop commands" */
 		arcmsr_hba_message_isr(acb);
 	}
 	return 0;
 }

 static int arcmsr_handle_hbb_isr(struct AdapterControlBlock *acb)
 {
 	uint32_t outbound_doorbell;
 	struct MessageUnit_B *reg = acb->pmuB;
 	outbound_doorbell = readl(reg->iop2drv_doorbell) &
 				acb->outbound_int_enable;
 	if (!outbound_doorbell)
 		return 1;

 	writel(~outbound_doorbell, reg->iop2drv_doorbell);
 	/*in case the last action of doorbell interrupt clearance is cached,
 	this action can push HW to write down the clear bit*/
 	readl(reg->iop2drv_doorbell);
 	writel(ARCMSR_DRV2IOP_END_OF_INTERRUPT, reg->drv2iop_doorbell);
 	if (outbound_doorbell & ARCMSR_IOP2DRV_DATA_WRITE_OK) {
 		arcmsr_iop2drv_data_wrote_handle(acb);
 	}
 	if (outbound_doorbell & ARCMSR_IOP2DRV_DATA_READ_OK) {
 		arcmsr_iop2drv_data_read_handle(acb);
 	}
 	if (outbound_doorbell & ARCMSR_IOP2DRV_CDB_DONE) {
 		arcmsr_hbb_postqueue_isr(acb);
 	}
 	if(outbound_doorbell & ARCMSR_IOP2DRV_MESSAGE_CMD_DONE) {
 		/* messenger of "driver to iop commands" */
 		arcmsr_hbb_message_isr(acb);
 	}
 	return 0;
 }

 static int arcmsr_handle_hbc_isr(struct AdapterControlBlock *pACB)
 {
 	uint32_t host_interrupt_status;
 	struct MessageUnit_C *phbcmu = (struct MessageUnit_C *)pACB->pmuC;
 	/*
 	*********************************************
 	**   check outbound intstatus
 	*********************************************
 	*/
 	host_interrupt_status = readl(&phbcmu->host_int_status);
 	if (!host_interrupt_status) {
 		/*it must be share irq*/
 		return 1;
 	}
 	/* MU ioctl transfer doorbell interrupts*/
 	if (host_interrupt_status & ARCMSR_HBCMU_OUTBOUND_DOORBELL_ISR) {
 		arcmsr_hbc_doorbell_isr(pACB);   /* messenger of "ioctl message read write" */
 	}
 	/* MU post queue interrupts*/
 	if (host_interrupt_status & ARCMSR_HBCMU_OUTBOUND_POSTQUEUE_ISR) {
 		arcmsr_hbc_postqueue_isr(pACB);  /* messenger of "scsi commands" */
 	}
 	return 0;
 }
 static irqreturn_t arcmsr_interrupt(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		if (arcmsr_handle_hba_isr(acb)) {
 			return IRQ_NONE;
 		}
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		if (arcmsr_handle_hbb_isr(acb)) {
 			return IRQ_NONE;
 		}
 		}
 		break;
 	 case ACB_ADAPTER_TYPE_C: {
 		if (arcmsr_handle_hbc_isr(acb)) {
 			return IRQ_NONE;
 		}
 		}
 	}
 	return IRQ_HANDLED;
 }

 static void arcmsr_iop_parking(struct AdapterControlBlock *acb)
 {
 	if (acb) {
 		/* stop adapter background rebuild */
 		if (acb->acb_flags & ACB_F_MSG_START_BGRB) {
 			uint32_t intmask_org;
 			acb->acb_flags &= ~ACB_F_MSG_START_BGRB;
 			intmask_org = arcmsr_disable_outbound_ints(acb);
 			arcmsr_stop_adapter_bgrb(acb);
 			arcmsr_flush_adapter_cache(acb);
 			arcmsr_enable_outbound_ints(acb, intmask_org);
 		}
 	}
 }

 void arcmsr_post_ioctldata2iop(struct AdapterControlBlock *acb)
 {
 	int32_t wqbuf_firstindex, wqbuf_lastindex;
 	uint8_t *pQbuffer;
 	struct QBUFFER __iomem *pwbuffer;
 	uint8_t __iomem *iop_data;
 	int32_t allxfer_len = 0;
 	pwbuffer = arcmsr_get_iop_wqbuffer(acb);
 	iop_data = (uint8_t __iomem *)pwbuffer->data;
 	if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_READED) {
 		acb->acb_flags &= (~ACB_F_MESSAGE_WQBUFFER_READED);
 		wqbuf_firstindex = acb->wqbuf_firstindex;
 		wqbuf_lastindex = acb->wqbuf_lastindex;
 		while ((wqbuf_firstindex != wqbuf_lastindex) && (allxfer_len < 124)) {
 			pQbuffer = &acb->wqbuffer[wqbuf_firstindex];
 			memcpy(iop_data, pQbuffer, 1);
 			wqbuf_firstindex++;
 			wqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
 			iop_data++;
 			allxfer_len++;
 		}
 		acb->wqbuf_firstindex = wqbuf_firstindex;
 		pwbuffer->data_len = allxfer_len;
 		arcmsr_iop_message_wrote(acb);
 	}
 }

 static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
 					struct scsi_cmnd *cmd)
 {
 	struct CMD_MESSAGE_FIELD *pcmdmessagefld;
 	int retvalue = 0, transfer_len = 0;
 	char *buffer;
 	struct scatterlist *sg;
 	uint32_t controlcode = (uint32_t ) cmd->cmnd[5] << 24 |
 						(uint32_t ) cmd->cmnd[6] << 16 |
 						(uint32_t ) cmd->cmnd[7] << 8  |
 						(uint32_t ) cmd->cmnd[8];
 						/* 4 bytes: Areca io control code */
 	sg = scsi_sglist(cmd);
 	buffer = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
 	if (scsi_sg_count(cmd) > 1) {
 		retvalue = ARCMSR_MESSAGE_FAIL;
 		goto message_out;
 	}
 	transfer_len += sg->length;

 	if (transfer_len > sizeof(struct CMD_MESSAGE_FIELD)) {
 		retvalue = ARCMSR_MESSAGE_FAIL;
 		goto message_out;
 	}
 	pcmdmessagefld = (struct CMD_MESSAGE_FIELD *) buffer;
 	switch(controlcode) {

 	case ARCMSR_MESSAGE_READ_RQBUFFER: {
 		unsigned char *ver_addr;
 		uint8_t *pQbuffer, *ptmpQbuffer;
 		int32_t allxfer_len = 0;

 		ver_addr = kmalloc(1032, GFP_ATOMIC);
 		if (!ver_addr) {
 			retvalue = ARCMSR_MESSAGE_FAIL;
 			goto message_out;
 		}

 		ptmpQbuffer = ver_addr;
 		while ((acb->rqbuf_firstindex != acb->rqbuf_lastindex)
 			&& (allxfer_len < 1031)) {
 			pQbuffer = &acb->rqbuffer[acb->rqbuf_firstindex];
 			memcpy(ptmpQbuffer, pQbuffer, 1);
 			acb->rqbuf_firstindex++;
 			acb->rqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
 			ptmpQbuffer++;
 			allxfer_len++;
 		}
 		if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {

 			struct QBUFFER __iomem *prbuffer;
 			uint8_t __iomem *iop_data;
 			int32_t iop_len;

 			acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
 			prbuffer = arcmsr_get_iop_rqbuffer(acb);
 			iop_data = prbuffer->data;
 			iop_len = readl(&prbuffer->data_len);
 			while (iop_len > 0) {
 				acb->rqbuffer[acb->rqbuf_lastindex] = readb(iop_data);
 				acb->rqbuf_lastindex++;
 				acb->rqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
 				iop_data++;
 				iop_len--;
 			}
 			arcmsr_iop_message_read(acb);
 		}
 		memcpy(pcmdmessagefld->messagedatabuffer, ver_addr, allxfer_len);
 		pcmdmessagefld->cmdmessage.Length = allxfer_len;
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_OK;
 		}
 		kfree(ver_addr);
 		}
 		break;

 	case ARCMSR_MESSAGE_WRITE_WQBUFFER: {
 		unsigned char *ver_addr;
 		int32_t my_empty_len, user_len, wqbuf_firstindex, wqbuf_lastindex;
 		uint8_t *pQbuffer, *ptmpuserbuffer;

 		ver_addr = kmalloc(1032, GFP_ATOMIC);
 		if (!ver_addr) {
 			retvalue = ARCMSR_MESSAGE_FAIL;
 			goto message_out;
 		}
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_OK;
 		}
 		ptmpuserbuffer = ver_addr;
 		user_len = pcmdmessagefld->cmdmessage.Length;
 		memcpy(ptmpuserbuffer, pcmdmessagefld->messagedatabuffer, user_len);
 		wqbuf_lastindex = acb->wqbuf_lastindex;
 		wqbuf_firstindex = acb->wqbuf_firstindex;
 		if (wqbuf_lastindex != wqbuf_firstindex) {
 			struct SENSE_DATA *sensebuffer =
 				(struct SENSE_DATA *)cmd->sense_buffer;
 			arcmsr_post_ioctldata2iop(acb);
 			/* has error report sensedata */
 			sensebuffer->ErrorCode = 0x70;
 			sensebuffer->SenseKey = ILLEGAL_REQUEST;
 			sensebuffer->AdditionalSenseLength = 0x0A;
 			sensebuffer->AdditionalSenseCode = 0x20;
 			sensebuffer->Valid = 1;
 			retvalue = ARCMSR_MESSAGE_FAIL;
 		} else {
 			my_empty_len = (wqbuf_firstindex-wqbuf_lastindex - 1)
 				&(ARCMSR_MAX_QBUFFER - 1);
 			if (my_empty_len >= user_len) {
 				while (user_len > 0) {
 					pQbuffer =
 					&acb->wqbuffer[acb->wqbuf_lastindex];
 					memcpy(pQbuffer, ptmpuserbuffer, 1);
 					acb->wqbuf_lastindex++;
 					acb->wqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
 					ptmpuserbuffer++;
 					user_len--;
 				}
 				if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_CLEARED) {
 					acb->acb_flags &=
 						~ACB_F_MESSAGE_WQBUFFER_CLEARED;
 					arcmsr_post_ioctldata2iop(acb);
 				}
 			} else {
 				/* has error report sensedata */
 				struct SENSE_DATA *sensebuffer =
 					(struct SENSE_DATA *)cmd->sense_buffer;
 				sensebuffer->ErrorCode = 0x70;
 				sensebuffer->SenseKey = ILLEGAL_REQUEST;
 				sensebuffer->AdditionalSenseLength = 0x0A;
 				sensebuffer->AdditionalSenseCode = 0x20;
 				sensebuffer->Valid = 1;
 				retvalue = ARCMSR_MESSAGE_FAIL;
 			}
 			}
 			kfree(ver_addr);
 		}
 		break;

 	case ARCMSR_MESSAGE_CLEAR_RQBUFFER: {
 		uint8_t *pQbuffer = acb->rqbuffer;
 		if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
 			acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
 			arcmsr_iop_message_read(acb);
 		}
 		acb->acb_flags |= ACB_F_MESSAGE_RQBUFFER_CLEARED;
 		acb->rqbuf_firstindex = 0;
 		acb->rqbuf_lastindex = 0;
 		memset(pQbuffer, 0, ARCMSR_MAX_QBUFFER);
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_OK;
 		}
 		}
 		break;

 	case ARCMSR_MESSAGE_CLEAR_WQBUFFER: {
 		uint8_t *pQbuffer = acb->wqbuffer;
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_OK;
 		}

 		if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
 			acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
 			arcmsr_iop_message_read(acb);
 		}
 		acb->acb_flags |=
 			(ACB_F_MESSAGE_WQBUFFER_CLEARED |
 				ACB_F_MESSAGE_WQBUFFER_READED);
 		acb->wqbuf_firstindex = 0;
 		acb->wqbuf_lastindex = 0;
 		memset(pQbuffer, 0, ARCMSR_MAX_QBUFFER);
 		}
 		break;

 	case ARCMSR_MESSAGE_CLEAR_ALLQBUFFER: {
 		uint8_t *pQbuffer;

 		if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
 			acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
 			arcmsr_iop_message_read(acb);
 		}
 		acb->acb_flags |=
 			(ACB_F_MESSAGE_WQBUFFER_CLEARED
 			| ACB_F_MESSAGE_RQBUFFER_CLEARED
 			| ACB_F_MESSAGE_WQBUFFER_READED);
 		acb->rqbuf_firstindex = 0;
 		acb->rqbuf_lastindex = 0;
 		acb->wqbuf_firstindex = 0;
 		acb->wqbuf_lastindex = 0;
 		pQbuffer = acb->rqbuffer;
 		memset(pQbuffer, 0, sizeof(struct QBUFFER));
 		pQbuffer = acb->wqbuffer;
 		memset(pQbuffer, 0, sizeof(struct QBUFFER));
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_OK;
 		}
 		}
 		break;

 	case ARCMSR_MESSAGE_RETURN_CODE_3F: {
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_3F;
 		}
 		break;
 		}
 	case ARCMSR_MESSAGE_SAY_HELLO: {
 		int8_t *hello_string = "Hello! I am ARCMSR";
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}else{
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_OK;
 		}
 		memcpy(pcmdmessagefld->messagedatabuffer, hello_string
 			, (int16_t)strlen(hello_string));
 		}
 		break;

 	case ARCMSR_MESSAGE_SAY_GOODBYE:
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}
 		arcmsr_iop_parking(acb);
 		break;

 	case ARCMSR_MESSAGE_FLUSH_ADAPTER_CACHE:
 		if(acb->fw_flag == FW_DEADLOCK) {
 			pcmdmessagefld->cmdmessage.ReturnCode =
 			ARCMSR_MESSAGE_RETURNCODE_BUS_HANG_ON;
 		}
 		arcmsr_flush_adapter_cache(acb);
 		break;

 	default:
 		retvalue = ARCMSR_MESSAGE_FAIL;
 	}
 	message_out:
 	sg = scsi_sglist(cmd);
 	kunmap_atomic(buffer - sg->offset, KM_IRQ0);
 	return retvalue;
 }

 static struct CommandControlBlock *arcmsr_get_freeccb(struct AdapterControlBlock *acb)
 {
 	struct list_head *head = &acb->ccb_free_list;
 	struct CommandControlBlock *ccb = NULL;
 	unsigned long flags;
 	spin_lock_irqsave(&acb->ccblist_lock, flags);
 	if (!list_empty(head)) {
 		ccb = list_entry(head->next, struct CommandControlBlock, list);
 		list_del_init(&ccb->list);
 	}else{
 		spin_unlock_irqrestore(&acb->ccblist_lock, flags);
 		return 0;
 	}
 	spin_unlock_irqrestore(&acb->ccblist_lock, flags);
 	return ccb;
 }

 static void arcmsr_handle_virtual_command(struct AdapterControlBlock *acb,
 		struct scsi_cmnd *cmd)
 {
 	switch (cmd->cmnd[0]) {
 	case INQUIRY: {
 		unsigned char inqdata[36];
 		char *buffer;
 		struct scatterlist *sg;

 		if (cmd->device->lun) {
 			cmd->result = (DID_TIME_OUT << 16);
 			cmd->scsi_done(cmd);
 			return;
 		}
 		inqdata[0] = TYPE_PROCESSOR;
 		/* Periph Qualifier & Periph Dev Type */
 		inqdata[1] = 0;
 		/* rem media bit & Dev Type Modifier */
 		inqdata[2] = 0;
 		/* ISO, ECMA, & ANSI versions */
 		inqdata[4] = 31;
 		/* length of additional data */
 		strncpy(&inqdata[8], "Areca   ", 8);
 		/* Vendor Identification */
 		strncpy(&inqdata[16], "RAID controller ", 16);
 		/* Product Identification */
 		strncpy(&inqdata[32], "R001", 4); /* Product Revision */

 		sg = scsi_sglist(cmd);
 		buffer = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;

 		memcpy(buffer, inqdata, sizeof(inqdata));
 		sg = scsi_sglist(cmd);
 		kunmap_atomic(buffer - sg->offset, KM_IRQ0);

 		cmd->scsi_done(cmd);
 	}
 	break;
 	case WRITE_BUFFER:
 	case READ_BUFFER: {
 		if (arcmsr_iop_message_xfer(acb, cmd))
 			cmd->result = (DID_ERROR << 16);
 		cmd->scsi_done(cmd);
 	}
 	break;
 	default:
 		cmd->scsi_done(cmd);
 	}
 }

 static int arcmsr_queue_command_lck(struct scsi_cmnd *cmd,
 	void (* done)(struct scsi_cmnd *))
 {
 	struct Scsi_Host *host = cmd->device->host;
 	struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
 	struct CommandControlBlock *ccb;
 	int target = cmd->device->id;
 	int lun = cmd->device->lun;
 	uint8_t scsicmd = cmd->cmnd[0];
 	cmd->scsi_done = done;
 	cmd->host_scribble = NULL;
 	cmd->result = 0;
 	if ((scsicmd == SYNCHRONIZE_CACHE) ||(scsicmd == SEND_DIAGNOSTIC)){
 		if(acb->devstate[target][lun] == ARECA_RAID_GONE) {
     			cmd->result = (DID_NO_CONNECT << 16);
 		}
 		cmd->scsi_done(cmd);
 		return 0;
 	}
 	if (target == 16) {
 		/* virtual device for iop message transfer */
 		arcmsr_handle_virtual_command(acb, cmd);
 		return 0;
 	}
 	if (atomic_read(&acb->ccboutstandingcount) >=
 			ARCMSR_MAX_OUTSTANDING_CMD)
 		return SCSI_MLQUEUE_HOST_BUSY;
 	ccb = arcmsr_get_freeccb(acb);
 	if (!ccb)
 		return SCSI_MLQUEUE_HOST_BUSY;
 	if (arcmsr_build_ccb( acb, ccb, cmd ) == FAILED) {
 		cmd->result = (DID_ERROR << 16) | (RESERVATION_CONFLICT << 1);
 		cmd->scsi_done(cmd);
 		return 0;
 	}
 	arcmsr_post_ccb(acb, ccb);
 	return 0;
 }

 static DEF_SCSI_QCMD(arcmsr_queue_command)

 static bool arcmsr_get_hba_config(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	char *acb_firm_model = acb->firm_model;
 	char *acb_firm_version = acb->firm_version;
 	char *acb_device_map = acb->device_map;
 	char __iomem *iop_firm_model = (char __iomem *)(&reg->message_rwbuffer[15]);
 	char __iomem *iop_firm_version = (char __iomem *)(&reg->message_rwbuffer[17]);
 	char __iomem *iop_device_map = (char __iomem *)(&reg->message_rwbuffer[21]);
 	int count;
 	writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
 	if (!arcmsr_hba_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'get adapter firmware \
 			miscellaneous data' timeout \n", acb->host->host_no);
 		return false;
 	}
 	count = 8;
 	while (count){
 		*acb_firm_model = readb(iop_firm_model);
 		acb_firm_model++;
 		iop_firm_model++;
 		count--;
 	}

 	count = 16;
 	while (count){
 		*acb_firm_version = readb(iop_firm_version);
 		acb_firm_version++;
 		iop_firm_version++;
 		count--;
 	}

 	count=16;
 	while(count){
 		*acb_device_map = readb(iop_device_map);
 		acb_device_map++;
 		iop_device_map++;
 		count--;
 	}
 	printk(KERN_NOTICE "Areca RAID Controller%d: F/W %s & Model %s\n",
 		acb->host->host_no,
 		acb->firm_version,
 		acb->firm_model);
 	acb->signature = readl(&reg->message_rwbuffer[0]);
 	acb->firm_request_len = readl(&reg->message_rwbuffer[1]);
 	acb->firm_numbers_queue = readl(&reg->message_rwbuffer[2]);
 	acb->firm_sdram_size = readl(&reg->message_rwbuffer[3]);
 	acb->firm_hd_channels = readl(&reg->message_rwbuffer[4]);
 	acb->firm_cfg_version = readl(&reg->message_rwbuffer[25]);  /*firm_cfg_version,25,100-103*/
 	return true;
 }
 static bool arcmsr_get_hbb_config(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	struct pci_dev *pdev = acb->pdev;
 	void *dma_coherent;
 	dma_addr_t dma_coherent_handle;
 	char *acb_firm_model = acb->firm_model;
 	char *acb_firm_version = acb->firm_version;
 	char *acb_device_map = acb->device_map;
 	char __iomem *iop_firm_model;
 	/*firm_model,15,60-67*/
 	char __iomem *iop_firm_version;
 	/*firm_version,17,68-83*/
 	char __iomem *iop_device_map;
 	/*firm_version,21,84-99*/
 	int count;
 	dma_coherent = dma_alloc_coherent(&pdev->dev, sizeof(struct MessageUnit_B), &dma_coherent_handle, GFP_KERNEL);
 	if (!dma_coherent){
 		printk(KERN_NOTICE "arcmsr%d: dma_alloc_coherent got error for hbb mu\n", acb->host->host_no);
 		return false;
 	}
 	acb->dma_coherent_handle_hbb_mu = dma_coherent_handle;
 	reg = (struct MessageUnit_B *)dma_coherent;
 	acb->pmuB = reg;
 	reg->drv2iop_doorbell= (uint32_t __iomem *)((unsigned long)acb->mem_base0 + ARCMSR_DRV2IOP_DOORBELL);
 	reg->drv2iop_doorbell_mask = (uint32_t __iomem *)((unsigned long)acb->mem_base0 + ARCMSR_DRV2IOP_DOORBELL_MASK);
 	reg->iop2drv_doorbell = (uint32_t __iomem *)((unsigned long)acb->mem_base0 + ARCMSR_IOP2DRV_DOORBELL);
 	reg->iop2drv_doorbell_mask = (uint32_t __iomem *)((unsigned long)acb->mem_base0 + ARCMSR_IOP2DRV_DOORBELL_MASK);
 	reg->message_wbuffer = (uint32_t __iomem *)((unsigned long)acb->mem_base1 + ARCMSR_MESSAGE_WBUFFER);
 	reg->message_rbuffer =  (uint32_t __iomem *)((unsigned long)acb->mem_base1 + ARCMSR_MESSAGE_RBUFFER);
 	reg->message_rwbuffer = (uint32_t __iomem *)((unsigned long)acb->mem_base1 + ARCMSR_MESSAGE_RWBUFFER);
 	iop_firm_model = (char __iomem *)(&reg->message_rwbuffer[15]);	/*firm_model,15,60-67*/
 	iop_firm_version = (char __iomem *)(&reg->message_rwbuffer[17]);	/*firm_version,17,68-83*/
 	iop_device_map = (char __iomem *)(&reg->message_rwbuffer[21]);	/*firm_version,21,84-99*/

 	writel(ARCMSR_MESSAGE_GET_CONFIG, reg->drv2iop_doorbell);
 	if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'get adapter firmware \
 			miscellaneous data' timeout \n", acb->host->host_no);
 		return false;
 	}
 	count = 8;
 	while (count){
 		*acb_firm_model = readb(iop_firm_model);
 		acb_firm_model++;
 		iop_firm_model++;
 		count--;
 	}
 	count = 16;
 	while (count){
 		*acb_firm_version = readb(iop_firm_version);
 		acb_firm_version++;
 		iop_firm_version++;
 		count--;
 	}

 	count = 16;
 	while(count){
 		*acb_device_map = readb(iop_device_map);
 		acb_device_map++;
 		iop_device_map++;
 		count--;
 	}

 	printk(KERN_NOTICE "Areca RAID Controller%d: F/W %s & Model %s\n",
 		acb->host->host_no,
 		acb->firm_version,
 		acb->firm_model);

 	acb->signature = readl(&reg->message_rwbuffer[1]);
 	/*firm_signature,1,00-03*/
 	acb->firm_request_len = readl(&reg->message_rwbuffer[2]);
 	/*firm_request_len,1,04-07*/
 	acb->firm_numbers_queue = readl(&reg->message_rwbuffer[3]);
 	/*firm_numbers_queue,2,08-11*/
 	acb->firm_sdram_size = readl(&reg->message_rwbuffer[4]);
 	/*firm_sdram_size,3,12-15*/
 	acb->firm_hd_channels = readl(&reg->message_rwbuffer[5]);
 	/*firm_ide_channels,4,16-19*/
 	acb->firm_cfg_version = readl(&reg->message_rwbuffer[25]);  /*firm_cfg_version,25,100-103*/
 	/*firm_ide_channels,4,16-19*/
 	return true;
 }

 static bool arcmsr_get_hbc_config(struct AdapterControlBlock *pACB)
 {
 	uint32_t intmask_org, Index, firmware_state = 0;
 	struct MessageUnit_C *reg = pACB->pmuC;
 	char *acb_firm_model = pACB->firm_model;
 	char *acb_firm_version = pACB->firm_version;
 	char *iop_firm_model = (char *)(&reg->msgcode_rwbuffer[15]);    /*firm_model,15,60-67*/
 	char *iop_firm_version = (char *)(&reg->msgcode_rwbuffer[17]);  /*firm_version,17,68-83*/
 	int count;
 	/* disable all outbound interrupt */
 	intmask_org = readl(&reg->host_int_mask); /* disable outbound message0 int */
 	writel(intmask_org|ARCMSR_HBCMU_ALL_INTMASKENABLE, &reg->host_int_mask);
 	/* wait firmware ready */
 	do {
 		firmware_state = readl(&reg->outbound_msgaddr1);
 	} while ((firmware_state & ARCMSR_HBCMU_MESSAGE_FIRMWARE_OK) == 0);
 	/* post "get config" instruction */
 	writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
 	writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 	/* wait message ready */
 	for (Index = 0; Index < 2000; Index++) {
 		if (readl(&reg->outbound_doorbell) & ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE) {
 			writel(ARCMSR_HBCMU_IOP2DRV_MESSAGE_CMD_DONE_DOORBELL_CLEAR, &reg->outbound_doorbell_clear);/*clear interrupt*/
 			break;
 		}
 		udelay(10);
 	} /*max 1 seconds*/
 	if (Index >= 2000) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'get adapter firmware \
 			miscellaneous data' timeout \n", pACB->host->host_no);
 		return false;
 	}
 	count = 8;
 	while (count) {
 		*acb_firm_model = readb(iop_firm_model);
 		acb_firm_model++;
 		iop_firm_model++;
 		count--;
 	}
 	count = 16;
 	while (count) {
 		*acb_firm_version = readb(iop_firm_version);
 		acb_firm_version++;
 		iop_firm_version++;
 		count--;
 	}
 	printk(KERN_NOTICE "Areca RAID Controller%d: F/W %s & Model %s\n",
 		pACB->host->host_no,
 		pACB->firm_version,
 		pACB->firm_model);
 	pACB->firm_request_len = readl(&reg->msgcode_rwbuffer[1]);   /*firm_request_len,1,04-07*/
 	pACB->firm_numbers_queue = readl(&reg->msgcode_rwbuffer[2]); /*firm_numbers_queue,2,08-11*/
 	pACB->firm_sdram_size = readl(&reg->msgcode_rwbuffer[3]);    /*firm_sdram_size,3,12-15*/
 	pACB->firm_hd_channels = readl(&reg->msgcode_rwbuffer[4]);  /*firm_ide_channels,4,16-19*/
 	pACB->firm_cfg_version = readl(&reg->msgcode_rwbuffer[25]);  /*firm_cfg_version,25,100-103*/
 	/*all interrupt service will be enable at arcmsr_iop_init*/
 	return true;
 }
 static bool arcmsr_get_firmware_spec(struct AdapterControlBlock *acb)
 {
 	if (acb->adapter_type == ACB_ADAPTER_TYPE_A)
 		return arcmsr_get_hba_config(acb);
 	else if (acb->adapter_type == ACB_ADAPTER_TYPE_B)
 		return arcmsr_get_hbb_config(acb);
 	else
 		return arcmsr_get_hbc_config(acb);
 }

 static int arcmsr_polling_hba_ccbdone(struct AdapterControlBlock *acb,
 	struct CommandControlBlock *poll_ccb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	struct CommandControlBlock *ccb;
 	struct ARCMSR_CDB *arcmsr_cdb;
 	uint32_t flag_ccb, outbound_intstatus, poll_ccb_done = 0, poll_count = 0;
 	int rtn;
 	bool error;
 	polling_hba_ccb_retry:
 	poll_count++;
 	outbound_intstatus = readl(&reg->outbound_intstatus) & acb->outbound_int_enable;
 	writel(outbound_intstatus, &reg->outbound_intstatus);/*clear interrupt*/
 	while (1) {
 		if ((flag_ccb = readl(&reg->outbound_queueport)) == 0xFFFFFFFF) {
 			if (poll_ccb_done){
 				rtn = SUCCESS;
 				break;
 			}else {
 				msleep(25);
 				if (poll_count > 100){
 					rtn = FAILED;
 					break;
 				}
 				goto polling_hba_ccb_retry;
 			}
 		}
 		arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));
 		ccb = container_of(arcmsr_cdb, struct CommandControlBlock, arcmsr_cdb);
 		poll_ccb_done = (ccb == poll_ccb) ? 1:0;
 		if ((ccb->acb != acb) || (ccb->startdone != ARCMSR_CCB_START)) {
 			if ((ccb->startdone == ARCMSR_CCB_ABORTED) || (ccb == poll_ccb)) {
 				printk(KERN_NOTICE "arcmsr%d: scsi id = %d lun = %d ccb = '0x%p'"
 					" poll command abort successfully \n"
 					, acb->host->host_no
 					, ccb->pcmd->device->id
 					, ccb->pcmd->device->lun
 					, ccb);
 				ccb->pcmd->result = DID_ABORT << 16;
 				arcmsr_ccb_complete(ccb);
 				continue;
 			}
 			printk(KERN_NOTICE "arcmsr%d: polling get an illegal ccb"
 				" command done ccb = '0x%p'"
 				"ccboutstandingcount = %d \n"
 				, acb->host->host_no
 				, ccb
 				, atomic_read(&acb->ccboutstandingcount));
 			continue;
 		}
 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 		arcmsr_report_ccb_state(acb, ccb, error);
 	}
 	return rtn;
 }

 static int arcmsr_polling_hbb_ccbdone(struct AdapterControlBlock *acb,
 					struct CommandControlBlock *poll_ccb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	struct ARCMSR_CDB *arcmsr_cdb;
 	struct CommandControlBlock *ccb;
 	uint32_t flag_ccb, poll_ccb_done = 0, poll_count = 0;
 	int index, rtn;
 	bool error;
 	polling_hbb_ccb_retry:

 	poll_count++;
 	/* clear doorbell interrupt */
 	writel(ARCMSR_DOORBELL_INT_CLEAR_PATTERN, reg->iop2drv_doorbell);
 	while(1){
 		index = reg->doneq_index;
 		if ((flag_ccb = readl(&reg->done_qbuffer[index])) == 0) {
 			if (poll_ccb_done){
 				rtn = SUCCESS;
 				break;
 			}else {
 				msleep(25);
 				if (poll_count > 100){
 					rtn = FAILED;
 					break;
 				}
 				goto polling_hbb_ccb_retry;
 			}
 		}
 		writel(0, &reg->done_qbuffer[index]);
 		index++;
 		/*if last index number set it to 0 */
 		index %= ARCMSR_MAX_HBB_POSTQUEUE;
 		reg->doneq_index = index;
 		/* check if command done with no error*/
 		arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));
 		ccb = container_of(arcmsr_cdb, struct CommandControlBlock, arcmsr_cdb);
 		poll_ccb_done = (ccb == poll_ccb) ? 1:0;
 		if ((ccb->acb != acb) || (ccb->startdone != ARCMSR_CCB_START)) {
 			if ((ccb->startdone == ARCMSR_CCB_ABORTED) || (ccb == poll_ccb)) {
 				printk(KERN_NOTICE "arcmsr%d: scsi id = %d lun = %d ccb = '0x%p'"
 					" poll command abort successfully \n"
 					,acb->host->host_no
 					,ccb->pcmd->device->id
 					,ccb->pcmd->device->lun
 					,ccb);
 				ccb->pcmd->result = DID_ABORT << 16;
 				arcmsr_ccb_complete(ccb);
 				continue;
 			}
 			printk(KERN_NOTICE "arcmsr%d: polling get an illegal ccb"
 				" command done ccb = '0x%p'"
 				"ccboutstandingcount = %d \n"
 				, acb->host->host_no
 				, ccb
 				, atomic_read(&acb->ccboutstandingcount));
 			continue;
 		}
 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
 		arcmsr_report_ccb_state(acb, ccb, error);
 	}
 	return rtn;
 }

 static int arcmsr_polling_hbc_ccbdone(struct AdapterControlBlock *acb, struct CommandControlBlock *poll_ccb)
 {
 	struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
 	uint32_t flag_ccb, ccb_cdb_phy;
 	struct ARCMSR_CDB *arcmsr_cdb;
 	bool error;
 	struct CommandControlBlock *pCCB;
 	uint32_t poll_ccb_done = 0, poll_count = 0;
 	int rtn;
 polling_hbc_ccb_retry:
 	poll_count++;
 	while (1) {
 		if ((readl(&reg->host_int_status) & ARCMSR_HBCMU_OUTBOUND_POSTQUEUE_ISR) == 0) {
 			if (poll_ccb_done) {
 				rtn = SUCCESS;
 				break;
 			} else {
 				msleep(25);
 				if (poll_count > 100) {
 					rtn = FAILED;
 					break;
 				}
 				goto polling_hbc_ccb_retry;
 			}
 		}
 		flag_ccb = readl(&reg->outbound_queueport_low);
 		ccb_cdb_phy = (flag_ccb & 0xFFFFFFF0);
 		arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset + ccb_cdb_phy);/*frame must be 32 bytes aligned*/
 		pCCB = container_of(arcmsr_cdb, struct CommandControlBlock, arcmsr_cdb);
 		poll_ccb_done = (pCCB == poll_ccb) ? 1 : 0;
 		/* check ifcommand done with no error*/
 		if ((pCCB->acb != acb) || (pCCB->startdone != ARCMSR_CCB_START)) {
 			if (pCCB->startdone == ARCMSR_CCB_ABORTED) {
 				printk(KERN_NOTICE "arcmsr%d: scsi id = %d lun = %d ccb = '0x%p'"
 					" poll command abort successfully \n"
 					, acb->host->host_no
 					, pCCB->pcmd->device->id
 					, pCCB->pcmd->device->lun
 					, pCCB);
 					pCCB->pcmd->result = DID_ABORT << 16;
 					arcmsr_ccb_complete(pCCB);
 				continue;
 			}
 			printk(KERN_NOTICE "arcmsr%d: polling get an illegal ccb"
 				" command done ccb = '0x%p'"
 				"ccboutstandingcount = %d \n"
 				, acb->host->host_no
 				, pCCB
 				, atomic_read(&acb->ccboutstandingcount));
 			continue;
 		}
 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1) ? true : false;
 		arcmsr_report_ccb_state(acb, pCCB, error);
 	}
 	return rtn;
 }
 static int arcmsr_polling_ccbdone(struct AdapterControlBlock *acb,
 					struct CommandControlBlock *poll_ccb)
 {
 	int rtn = 0;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		rtn = arcmsr_polling_hba_ccbdone(acb, poll_ccb);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		rtn = arcmsr_polling_hbb_ccbdone(acb, poll_ccb);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		rtn = arcmsr_polling_hbc_ccbdone(acb, poll_ccb);
 		}
 	}
 	return rtn;
 }

 static int arcmsr_iop_confirm(struct AdapterControlBlock *acb)
 {
 	uint32_t cdb_phyaddr, cdb_phyaddr_hi32;
 	dma_addr_t dma_coherent_handle;
 	/*
 	********************************************************************
 	** here we need to tell iop 331 our freeccb.HighPart
 	** if freeccb.HighPart is not zero
 	********************************************************************
 	*/
 	dma_coherent_handle = acb->dma_coherent_handle;
 	cdb_phyaddr = (uint32_t)(dma_coherent_handle);
 	cdb_phyaddr_hi32 = (uint32_t)((cdb_phyaddr >> 16) >> 16);
 	acb->cdb_phyaddr_hi32 = cdb_phyaddr_hi32;
 	/*
 	***********************************************************************
 	**    if adapter type B, set window of "post command Q"
 	***********************************************************************
 	*/
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		if (cdb_phyaddr_hi32 != 0) {
 			struct MessageUnit_A __iomem *reg = acb->pmuA;
 			uint32_t intmask_org;
 			intmask_org = arcmsr_disable_outbound_ints(acb);
 			writel(ARCMSR_SIGNATURE_SET_CONFIG, \
 						&reg->message_rwbuffer[0]);
 			writel(cdb_phyaddr_hi32, &reg->message_rwbuffer[1]);
 			writel(ARCMSR_INBOUND_MESG0_SET_CONFIG, \
 							&reg->inbound_msgaddr0);
 			if (!arcmsr_hba_wait_msgint_ready(acb)) {
 				printk(KERN_NOTICE "arcmsr%d: ""set ccb high \
 				part physical address timeout\n",
 				acb->host->host_no);
 				return 1;
 			}
 			arcmsr_enable_outbound_ints(acb, intmask_org);
 		}
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		unsigned long post_queue_phyaddr;
 		uint32_t __iomem *rwbuffer;

 		struct MessageUnit_B *reg = acb->pmuB;
 		uint32_t intmask_org;
 		intmask_org = arcmsr_disable_outbound_ints(acb);
 		reg->postq_index = 0;
 		reg->doneq_index = 0;
 		writel(ARCMSR_MESSAGE_SET_POST_WINDOW, reg->drv2iop_doorbell);
 		if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 			printk(KERN_NOTICE "arcmsr%d:can not set diver mode\n", \
 				acb->host->host_no);
 			return 1;
 		}
 		post_queue_phyaddr = acb->dma_coherent_handle_hbb_mu;
 		rwbuffer = reg->message_rwbuffer;
 		/* driver "set config" signature */
 		writel(ARCMSR_SIGNATURE_SET_CONFIG, rwbuffer++);
 		/* normal should be zero */
 		writel(cdb_phyaddr_hi32, rwbuffer++);
 		/* postQ size (256 + 8)*4	 */
 		writel(post_queue_phyaddr, rwbuffer++);
 		/* doneQ size (256 + 8)*4	 */
 		writel(post_queue_phyaddr + 1056, rwbuffer++);
 		/* ccb maxQ size must be --> [(256 + 8)*4]*/
 		writel(1056, rwbuffer);

 		writel(ARCMSR_MESSAGE_SET_CONFIG, reg->drv2iop_doorbell);
 		if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 			printk(KERN_NOTICE "arcmsr%d: 'set command Q window' \
 			timeout \n",acb->host->host_no);
 			return 1;
 		}
 		arcmsr_hbb_enable_driver_mode(acb);
 		arcmsr_enable_outbound_ints(acb, intmask_org);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		if (cdb_phyaddr_hi32 != 0) {
 			struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;

 			printk(KERN_NOTICE "arcmsr%d: cdb_phyaddr_hi32=0x%x\n",
 					acb->adapter_index, cdb_phyaddr_hi32);
 			writel(ARCMSR_SIGNATURE_SET_CONFIG, &reg->msgcode_rwbuffer[0]);
 			writel(cdb_phyaddr_hi32, &reg->msgcode_rwbuffer[1]);
 			writel(ARCMSR_INBOUND_MESG0_SET_CONFIG, &reg->inbound_msgaddr0);
 			writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 			if (!arcmsr_hbc_wait_msgint_ready(acb)) {
 				printk(KERN_NOTICE "arcmsr%d: 'set command Q window' \
 				timeout \n", acb->host->host_no);
 				return 1;
 			}
 		}
 		}
 	}
 	return 0;
 }

 static void arcmsr_wait_firmware_ready(struct AdapterControlBlock *acb)
 {
 	uint32_t firmware_state = 0;
 	switch (acb->adapter_type) {

 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		do {
 			firmware_state = readl(&reg->outbound_msgaddr1);
 		} while ((firmware_state & ARCMSR_OUTBOUND_MESG1_FIRMWARE_OK) == 0);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		do {
 			firmware_state = readl(reg->iop2drv_doorbell);
 		} while ((firmware_state & ARCMSR_MESSAGE_FIRMWARE_OK) == 0);
 		writel(ARCMSR_DRV2IOP_END_OF_INTERRUPT, reg->drv2iop_doorbell);
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
 		do {
 			firmware_state = readl(&reg->outbound_msgaddr1);
 		} while ((firmware_state & ARCMSR_HBCMU_MESSAGE_FIRMWARE_OK) == 0);
 		}
 	}
 }

 static void arcmsr_request_hba_device_map(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	if (unlikely(atomic_read(&acb->rq_map_token) == 0) || ((acb->acb_flags & ACB_F_BUS_RESET) != 0 ) || ((acb->acb_flags & ACB_F_ABORT) != 0 )){
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 		return;
 	} else {
 		acb->fw_flag = FW_NORMAL;
 		if (atomic_read(&acb->ante_token_value) == atomic_read(&acb->rq_map_token)){
 			atomic_set(&acb->rq_map_token, 16);
 		}
 		atomic_set(&acb->ante_token_value, atomic_read(&acb->rq_map_token));
 		if (atomic_dec_and_test(&acb->rq_map_token)) {
 			mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 			return;
 		}
 		writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 	}
 	return;
 }

 static void arcmsr_request_hbb_device_map(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B __iomem *reg = acb->pmuB;
 	if (unlikely(atomic_read(&acb->rq_map_token) == 0) || ((acb->acb_flags & ACB_F_BUS_RESET) != 0 ) || ((acb->acb_flags & ACB_F_ABORT) != 0 )){
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 		return;
 	} else {
 		acb->fw_flag = FW_NORMAL;
 		if (atomic_read(&acb->ante_token_value) == atomic_read(&acb->rq_map_token)) {
 			atomic_set(&acb->rq_map_token, 16);
 		}
 		atomic_set(&acb->ante_token_value, atomic_read(&acb->rq_map_token));
 		if (atomic_dec_and_test(&acb->rq_map_token)) {
 			mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 			return;
 		}
 		writel(ARCMSR_MESSAGE_GET_CONFIG, reg->drv2iop_doorbell);
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 	}
 	return;
 }

 static void arcmsr_request_hbc_device_map(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_C __iomem *reg = acb->pmuC;
 	if (unlikely(atomic_read(&acb->rq_map_token) == 0) || ((acb->acb_flags & ACB_F_BUS_RESET) != 0) || ((acb->acb_flags & ACB_F_ABORT) != 0)) {
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 		return;
 	} else {
 		acb->fw_flag = FW_NORMAL;
 		if (atomic_read(&acb->ante_token_value) == atomic_read(&acb->rq_map_token)) {
 			atomic_set(&acb->rq_map_token, 16);
 		}
 		atomic_set(&acb->ante_token_value, atomic_read(&acb->rq_map_token));
 		if (atomic_dec_and_test(&acb->rq_map_token)) {
 			mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 			return;
 		}
 		writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
 		writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &reg->inbound_doorbell);
 		mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 	}
 	return;
 }

 static void arcmsr_request_device_map(unsigned long pacb)
 {
 	struct AdapterControlBlock *acb = (struct AdapterControlBlock *)pacb;
 	switch (acb->adapter_type) {
 		case ACB_ADAPTER_TYPE_A: {
 			arcmsr_request_hba_device_map(acb);
 		}
 		break;
 		case ACB_ADAPTER_TYPE_B: {
 			arcmsr_request_hbb_device_map(acb);
 		}
 		break;
 		case ACB_ADAPTER_TYPE_C: {
 			arcmsr_request_hbc_device_map(acb);
 		}
 	}
 }

 static void arcmsr_start_hba_bgrb(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_A __iomem *reg = acb->pmuA;
 	acb->acb_flags |= ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_INBOUND_MESG0_START_BGRB, &reg->inbound_msgaddr0);
 	if (!arcmsr_hba_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'start adapter background \
 				rebulid' timeout \n", acb->host->host_no);
 	}
 }

 static void arcmsr_start_hbb_bgrb(struct AdapterControlBlock *acb)
 {
 	struct MessageUnit_B *reg = acb->pmuB;
 	acb->acb_flags |= ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_MESSAGE_START_BGRB, reg->drv2iop_doorbell);
 	if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'start adapter background \
 				rebulid' timeout \n",acb->host->host_no);
 	}
 }

 static void arcmsr_start_hbc_bgrb(struct AdapterControlBlock *pACB)
 {
 	struct MessageUnit_C *phbcmu = (struct MessageUnit_C *)pACB->pmuC;
 	pACB->acb_flags |= ACB_F_MSG_START_BGRB;
 	writel(ARCMSR_INBOUND_MESG0_START_BGRB, &phbcmu->inbound_msgaddr0);
 	writel(ARCMSR_HBCMU_DRV2IOP_MESSAGE_CMD_DONE, &phbcmu->inbound_doorbell);
 	if (!arcmsr_hbc_wait_msgint_ready(pACB)) {
 		printk(KERN_NOTICE "arcmsr%d: wait 'start adapter background \
 				rebulid' timeout \n", pACB->host->host_no);
 	}
 	return;
 }
 static void arcmsr_start_adapter_bgrb(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A:
 		arcmsr_start_hba_bgrb(acb);
 		break;
 	case ACB_ADAPTER_TYPE_B:
 		arcmsr_start_hbb_bgrb(acb);
 		break;
 	case ACB_ADAPTER_TYPE_C:
 		arcmsr_start_hbc_bgrb(acb);
 	}
 }

 static void arcmsr_clear_doorbell_queue_buffer(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A: {
 		struct MessageUnit_A __iomem *reg = acb->pmuA;
 		uint32_t outbound_doorbell;
 		/* empty doorbell Qbuffer if door bell ringed */
 		outbound_doorbell = readl(&reg->outbound_doorbell);
 		/*clear doorbell interrupt */
 		writel(outbound_doorbell, &reg->outbound_doorbell);
 		writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK, &reg->inbound_doorbell);
 		}
 		break;

 	case ACB_ADAPTER_TYPE_B: {
 		struct MessageUnit_B *reg = acb->pmuB;
 		/*clear interrupt and message state*/
 		writel(ARCMSR_MESSAGE_INT_CLEAR_PATTERN, reg->iop2drv_doorbell);
 		writel(ARCMSR_DRV2IOP_DATA_READ_OK, reg->drv2iop_doorbell);
 		/* let IOP know data has been read */
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C: {
 		struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
 		uint32_t outbound_doorbell;
 		/* empty doorbell Qbuffer if door bell ringed */
 		outbound_doorbell = readl(&reg->outbound_doorbell);
 		writel(outbound_doorbell, &reg->outbound_doorbell_clear);
 		writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);
 		}
 	}
 }

 static void arcmsr_enable_eoi_mode(struct AdapterControlBlock *acb)
 {
 	switch (acb->adapter_type) {
 	case ACB_ADAPTER_TYPE_A:
 		return;
 	case ACB_ADAPTER_TYPE_B:
 		{
 			struct MessageUnit_B *reg = acb->pmuB;
 			writel(ARCMSR_MESSAGE_ACTIVE_EOI_MODE, reg->drv2iop_doorbell);
 			if (!arcmsr_hbb_wait_msgint_ready(acb)) {
 				printk(KERN_NOTICE "ARCMSR IOP enables EOI_MODE TIMEOUT");
 				return;
 			}
 		}
 		break;
 	case ACB_ADAPTER_TYPE_C:
 		return;
 	}
 	return;
 }

 static void arcmsr_hardware_reset(struct AdapterControlBlock *acb)
 {
 	uint8_t value[64];
 	int i, count = 0;
 	struct MessageUnit_A __iomem *pmuA = acb->pmuA;
 	struct MessageUnit_C __iomem *pmuC = acb->pmuC;
 	u32 temp = 0;
 	/* backup pci config data */
 	printk(KERN_NOTICE "arcmsr%d: executing hw bus reset .....\n", acb->host->host_no);
 	for (i = 0; i < 64; i++) {
 		pci_read_config_byte(acb->pdev, i, &value[i]);
 	}
 	/* hardware reset signal */
 	if ((acb->dev_id == 0x1680)) {
 		writel(ARCMSR_ARC1680_BUS_RESET, &pmuA->reserved1[0]);
 	} else if ((acb->dev_id == 0x1880)) {
 		do {
 			count++;
 			writel(0xF, &pmuC->write_sequence);
 			writel(0x4, &pmuC->write_sequence);
 			writel(0xB, &pmuC->write_sequence);
 			writel(0x2, &pmuC->write_sequence);
 			writel(0x7, &pmuC->write_sequence);
 			writel(0xD, &pmuC->write_sequence);
 		} while ((((temp = readl(&pmuC->host_diagnostic)) | ARCMSR_ARC1880_DiagWrite_ENABLE) == 0) && (count < 5));
 		writel(ARCMSR_ARC1880_RESET_ADAPTER, &pmuC->host_diagnostic);
 	} else {
 		pci_write_config_byte(acb->pdev, 0x84, 0x20);
 	}
 	msleep(2000);
 	/* write back pci config data */
 	for (i = 0; i < 64; i++) {
 		pci_write_config_byte(acb->pdev, i, value[i]);
 	}
 	msleep(1000);
 	return;
 }
 static void arcmsr_iop_init(struct AdapterControlBlock *acb)
 {
 	uint32_t intmask_org;
 	/* disable all outbound interrupt */
 	intmask_org = arcmsr_disable_outbound_ints(acb);
 	arcmsr_wait_firmware_ready(acb);
 	arcmsr_iop_confirm(acb);
 	/*start background rebuild*/
 	arcmsr_start_adapter_bgrb(acb);
 	/* empty doorbell Qbuffer if door bell ringed */
 	arcmsr_clear_doorbell_queue_buffer(acb);
 	arcmsr_enable_eoi_mode(acb);
 	/* enable outbound Post Queue,outbound doorbell Interrupt */
 	arcmsr_enable_outbound_ints(acb, intmask_org);
 	acb->acb_flags |= ACB_F_IOP_INITED;
 }

 static uint8_t arcmsr_iop_reset(struct AdapterControlBlock *acb)
 {
 	struct CommandControlBlock *ccb;
 	uint32_t intmask_org;
 	uint8_t rtnval = 0x00;
 	int i = 0;
 	unsigned long flags;

 	if (atomic_read(&acb->ccboutstandingcount) != 0) {
 		/* disable all outbound interrupt */
 		intmask_org = arcmsr_disable_outbound_ints(acb);
 		/* talk to iop 331 outstanding command aborted */
 		rtnval = arcmsr_abort_allcmd(acb);
 		/* clear all outbound posted Q */
 		arcmsr_done4abort_postqueue(acb);
 		for (i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++) {
 			ccb = acb->pccb_pool[i];
 			if (ccb->startdone == ARCMSR_CCB_START) {
 				scsi_dma_unmap(ccb->pcmd);
 				ccb->startdone = ARCMSR_CCB_DONE;
 				ccb->ccb_flags = 0;
 				spin_lock_irqsave(&acb->ccblist_lock, flags);
 				list_add_tail(&ccb->list, &acb->ccb_free_list);
 				spin_unlock_irqrestore(&acb->ccblist_lock, flags);
 			}
 		}
 		atomic_set(&acb->ccboutstandingcount, 0);
 		/* enable all outbound interrupt */
 		arcmsr_enable_outbound_ints(acb, intmask_org);
 		return rtnval;
 	}
 	return rtnval;
 }

 static int arcmsr_bus_reset(struct scsi_cmnd *cmd)
 {
 	struct AdapterControlBlock *acb;
 	uint32_t intmask_org, outbound_doorbell;
 	int retry_count = 0;
 	int rtn = FAILED;
 	acb = (struct AdapterControlBlock *) cmd->device->host->hostdata;
 	printk(KERN_ERR "arcmsr: executing bus reset eh.....num_resets = %d, num_aborts = %d \n", acb->num_resets, acb->num_aborts);
 	acb->num_resets++;

 	switch(acb->adapter_type){
 		case ACB_ADAPTER_TYPE_A:{
 			if (acb->acb_flags & ACB_F_BUS_RESET){
 				long timeout;
 				printk(KERN_ERR "arcmsr: there is an  bus reset eh proceeding.......\n");
 				timeout = wait_event_timeout(wait_q, (acb->acb_flags & ACB_F_BUS_RESET) == 0, 220*HZ);
 				if (timeout) {
 					return SUCCESS;
 				}
 			}
 			acb->acb_flags |= ACB_F_BUS_RESET;
 			if (!arcmsr_iop_reset(acb)) {
 				struct MessageUnit_A __iomem *reg;
 				reg = acb->pmuA;
 				arcmsr_hardware_reset(acb);
 				acb->acb_flags &= ~ACB_F_IOP_INITED;
 sleep_again:
 				ssleep(ARCMSR_SLEEPTIME);
 				if ((readl(&reg->outbound_msgaddr1) & ARCMSR_OUTBOUND_MESG1_FIRMWARE_OK) == 0) {
 					printk(KERN_ERR "arcmsr%d: waiting for hw bus reset return, retry=%d\n", acb->host->host_no, retry_count);
 					if (retry_count > ARCMSR_RETRYCOUNT) {
 						acb->fw_flag = FW_DEADLOCK;
 						printk(KERN_ERR "arcmsr%d: waiting for hw bus reset return, RETRY TERMINATED!!\n", acb->host->host_no);
 						return FAILED;
 					}
 					retry_count++;
 					goto sleep_again;
 				}
 				acb->acb_flags |= ACB_F_IOP_INITED;
 				/* disable all outbound interrupt */
 				intmask_org = arcmsr_disable_outbound_ints(acb);
 				arcmsr_get_firmware_spec(acb);
 				arcmsr_start_adapter_bgrb(acb);
 				/* clear Qbuffer if door bell ringed */
 				outbound_doorbell = readl(&reg->outbound_doorbell);
 				writel(outbound_doorbell, &reg->outbound_doorbell); /*clear interrupt */
    				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK, &reg->inbound_doorbell);
 				/* enable outbound Post Queue,outbound doorbell Interrupt */
 				arcmsr_enable_outbound_ints(acb, intmask_org);
 				atomic_set(&acb->rq_map_token, 16);
 				atomic_set(&acb->ante_token_value, 16);
 				acb->fw_flag = FW_NORMAL;
 				mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				rtn = SUCCESS;
 				printk(KERN_ERR "arcmsr: scsi  bus reset eh returns with success\n");
 			} else {
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				atomic_set(&acb->rq_map_token, 16);
 				atomic_set(&acb->ante_token_value, 16);
 				acb->fw_flag = FW_NORMAL;
 				mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6*HZ));
 				rtn = SUCCESS;
 			}
 			break;
 		}
 		case ACB_ADAPTER_TYPE_B:{
 			acb->acb_flags |= ACB_F_BUS_RESET;
 			if (!arcmsr_iop_reset(acb)) {
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				rtn = FAILED;
 			} else {
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				atomic_set(&acb->rq_map_token, 16);
 				atomic_set(&acb->ante_token_value, 16);
 				acb->fw_flag = FW_NORMAL;
 				mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 				rtn = SUCCESS;
 			}
 			break;
 		}
 		case ACB_ADAPTER_TYPE_C:{
 			if (acb->acb_flags & ACB_F_BUS_RESET) {
 				long timeout;
 				printk(KERN_ERR "arcmsr: there is an bus reset eh proceeding.......\n");
 				timeout = wait_event_timeout(wait_q, (acb->acb_flags & ACB_F_BUS_RESET) == 0, 220*HZ);
 				if (timeout) {
 					return SUCCESS;
 				}
 			}
 			acb->acb_flags |= ACB_F_BUS_RESET;
 			if (!arcmsr_iop_reset(acb)) {
 				struct MessageUnit_C __iomem *reg;
 				reg = acb->pmuC;
 				arcmsr_hardware_reset(acb);
 				acb->acb_flags &= ~ACB_F_IOP_INITED;
 sleep:
 				ssleep(ARCMSR_SLEEPTIME);
 				if ((readl(&reg->host_diagnostic) & 0x04) != 0) {
 					printk(KERN_ERR "arcmsr%d: waiting for hw bus reset return, retry=%d\n", acb->host->host_no, retry_count);
 					if (retry_count > ARCMSR_RETRYCOUNT) {
 						acb->fw_flag = FW_DEADLOCK;
 						printk(KERN_ERR "arcmsr%d: waiting for hw bus reset return, RETRY TERMINATED!!\n", acb->host->host_no);
 						return FAILED;
 					}
 					retry_count++;
 					goto sleep;
 				}
 				acb->acb_flags |= ACB_F_IOP_INITED;
 				/* disable all outbound interrupt */
 				intmask_org = arcmsr_disable_outbound_ints(acb);
 				arcmsr_get_firmware_spec(acb);
 				arcmsr_start_adapter_bgrb(acb);
 				/* clear Qbuffer if door bell ringed */
 				outbound_doorbell = readl(&reg->outbound_doorbell);
 				writel(outbound_doorbell, &reg->outbound_doorbell_clear); /*clear interrupt */
 				writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);
 				/* enable outbound Post Queue,outbound doorbell Interrupt */
 				arcmsr_enable_outbound_ints(acb, intmask_org);
 				atomic_set(&acb->rq_map_token, 16);
 				atomic_set(&acb->ante_token_value, 16);
 				acb->fw_flag = FW_NORMAL;
 				mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6 * HZ));
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				rtn = SUCCESS;
 				printk(KERN_ERR "arcmsr: scsi bus reset eh returns with success\n");
 			} else {
 				acb->acb_flags &= ~ACB_F_BUS_RESET;
 				atomic_set(&acb->rq_map_token, 16);
 				atomic_set(&acb->ante_token_value, 16);
 				acb->fw_flag = FW_NORMAL;
 				mod_timer(&acb->eternal_timer, jiffies + msecs_to_jiffies(6*HZ));
 				rtn = SUCCESS;
 			}
 			break;
 		}
 	}
 	return rtn;
 }

 static int arcmsr_abort_one_cmd(struct AdapterControlBlock *acb,
 		struct CommandControlBlock *ccb)
 {
 	int rtn;
 	rtn = arcmsr_polling_ccbdone(acb, ccb);
 	return rtn;
 }

 static int arcmsr_abort(struct scsi_cmnd *cmd)
 {
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *)cmd->device->host->hostdata;
 	int i = 0;
 	int rtn = FAILED;
 	printk(KERN_NOTICE
 		"arcmsr%d: abort device command of scsi id = %d lun = %d \n",
 		acb->host->host_no, cmd->device->id, cmd->device->lun);
 	acb->acb_flags |= ACB_F_ABORT;
 	acb->num_aborts++;
 	/*
 	************************************************
 	** the all interrupt service routine is locked
 	** we need to handle it as soon as possible and exit
 	************************************************
 	*/
 	if (!atomic_read(&acb->ccboutstandingcount))
 		return rtn;

 	for (i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++) {
 		struct CommandControlBlock *ccb = acb->pccb_pool[i];
 		if (ccb->startdone == ARCMSR_CCB_START && ccb->pcmd == cmd) {
 			ccb->startdone = ARCMSR_CCB_ABORTED;
 			rtn = arcmsr_abort_one_cmd(acb, ccb);
 			break;
 		}
 	}
 	acb->acb_flags &= ~ACB_F_ABORT;
 	return rtn;
 }

 static const char *arcmsr_info(struct Scsi_Host *host)
 {
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	static char buf[256];
 	char *type;
 	int raid6 = 1;
 	switch (acb->pdev->device) {
 	case PCI_DEVICE_ID_ARECA_1110:
 	case PCI_DEVICE_ID_ARECA_1200:
 	case PCI_DEVICE_ID_ARECA_1202:
 	case PCI_DEVICE_ID_ARECA_1210:
 		raid6 = 0;
 		/*FALLTHRU*/
 	case PCI_DEVICE_ID_ARECA_1120:
 	case PCI_DEVICE_ID_ARECA_1130:
 	case PCI_DEVICE_ID_ARECA_1160:
 	case PCI_DEVICE_ID_ARECA_1170:
 	case PCI_DEVICE_ID_ARECA_1201:
 	case PCI_DEVICE_ID_ARECA_1220:
 	case PCI_DEVICE_ID_ARECA_1230:
 	case PCI_DEVICE_ID_ARECA_1260:
 	case PCI_DEVICE_ID_ARECA_1270:
 	case PCI_DEVICE_ID_ARECA_1280:
 		type = "SATA";
 		break;
 	case PCI_DEVICE_ID_ARECA_1380:
 	case PCI_DEVICE_ID_ARECA_1381:
 	case PCI_DEVICE_ID_ARECA_1680:
 	case PCI_DEVICE_ID_ARECA_1681:
 	case PCI_DEVICE_ID_ARECA_1880:
 		type = "SAS";
 		break;
 	default:
 		type = "X-TYPE";
 		break;
 	}
 	sprintf(buf, "Areca %s Host Adapter RAID Controller%s\n %s",
 			type, raid6 ? "( RAID6 capable)" : "",
 			ARCMSR_DRIVER_VERSION);
 	return buf;
 }