[SCSI] arcmsr: initial driver, version 1.20.00.13

arcmsr is a driver for the Areca Raid controller, a host based RAID
subsystem that speaks SCSI at the firmware level.

This patch is quite a clean up over the initial submission with
contributions from:

Randy Dunlap <rdunlap@xenotime.net>
Christoph Hellwig <hch@lst.de>
Matthew Wilcox <matthew@wil.cx>
Adrian Bunk <bunk@stusta.de>

Signed-off-by: Erich Chen <erich@areca.com.tw>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 1496 insertions, 0 deletions

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
new file mode 100644
index 000000000000..475f978ff8f0
--- /dev/null
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -0,0 +1,1496 @@
+/*
+*******************************************************************************
+**        O.S   : Linux
+**   FILE NAME  : arcmsr_hba.c
+**        BY    : Erich Chen
+**   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: erich@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/pci.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("Erich Chen <erich@areca.com.tw>");
+MODULE_DESCRIPTION("ARECA (ARC11xx/12xx) SATA RAID HOST Adapter");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(ARCMSR_DRIVER_VERSION);
+
+static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb, struct scsi_cmnd *cmd);
+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_cmnd * cmd,
+				void (*done) (struct scsi_cmnd *));
+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 void arcmsr_stop_adapter_bgrb(struct AdapterControlBlock *acb);
+static void arcmsr_flush_adapter_cache(struct AdapterControlBlock *acb);
+static uint8_t arcmsr_wait_msgint_ready(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)
+{
+	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 RAID HOST Adapter" 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_OUTSTANDING_CMD,
+	.this_id		= ARCMSR_SCSI_INITIATOR_ID,
+	.sg_tablesize		= ARCMSR_MAX_SG_ENTRIES,
+	.max_sectors    	= ARCMSR_MAX_XFER_SECTORS,
+	.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_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)},
+	{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 irqreturn_t arcmsr_do_interrupt(int irq, void *dev_id,
+	struct pt_regs *regs)
+{
+	irqreturn_t handle_state;
+	struct AdapterControlBlock *acb;
+	unsigned long flags;
+
+	acb = (struct AdapterControlBlock *)dev_id;
+
+	spin_lock_irqsave(acb->host->host_lock, flags);
+	handle_state = arcmsr_interrupt(acb);
+	spin_unlock_irqrestore(acb->host->host_lock, flags);
+	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 int arcmsr_alloc_ccb_pool(struct AdapterControlBlock *acb)
+{
+	struct pci_dev *pdev = acb->pdev;
+	struct MessageUnit __iomem *reg = acb->pmu;
+	u32 ccb_phyaddr_hi32;
+	void *dma_coherent;
+	dma_addr_t dma_coherent_handle, dma_addr;
+	struct CommandControlBlock *ccb_tmp;
+	int i, j;
+
+	dma_coherent = dma_alloc_coherent(&pdev->dev,
+			ARCMSR_MAX_FREECCB_NUM *
+			sizeof (struct CommandControlBlock) + 0x20,
+			&dma_coherent_handle, GFP_KERNEL);
+	if (!dma_coherent)
+		return -ENOMEM;
+
+	acb->dma_coherent = dma_coherent;
+	acb->dma_coherent_handle = dma_coherent_handle;
+
+	if (((unsigned long)dma_coherent & 0x1F)) {
+		dma_coherent = dma_coherent +
+			(0x20 - ((unsigned long)dma_coherent & 0x1F));
+		dma_coherent_handle = dma_coherent_handle +
+			(0x20 - ((unsigned long)dma_coherent_handle & 0x1F));
+	}
+
+	dma_addr = dma_coherent_handle;
+	ccb_tmp = (struct CommandControlBlock *)dma_coherent;
+	for (i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++) {
+		ccb_tmp->cdb_shifted_phyaddr = dma_addr >> 5;
+		ccb_tmp->acb = acb;
+		acb->pccb_pool[i] = ccb_tmp;
+		list_add_tail(&ccb_tmp->list, &acb->ccb_free_list);
+		dma_addr = dma_addr + sizeof (struct CommandControlBlock);
+		ccb_tmp++;
+	}
+
+	acb->vir2phy_offset = (unsigned long)ccb_tmp -
+			      (unsigned long)dma_addr;
+	for (i = 0; i < ARCMSR_MAX_TARGETID; i++)
+		for (j = 0; j < ARCMSR_MAX_TARGETLUN; j++)
+			acb->devstate[i][j] = ARECA_RAID_GOOD;
+
+	/*
+	** here we need to tell iop 331 our ccb_tmp.HighPart
+	** if ccb_tmp.HighPart is not zero
+	*/
+	ccb_phyaddr_hi32 = (uint32_t) ((dma_coherent_handle >> 16) >> 16);
+	if (ccb_phyaddr_hi32 != 0) {
+		writel(ARCMSR_SIGNATURE_SET_CONFIG, &reg->message_rwbuffer[0]);
+		writel(ccb_phyaddr_hi32, &reg->message_rwbuffer[1]);
+		writel(ARCMSR_INBOUND_MESG0_SET_CONFIG, &reg->inbound_msgaddr0);
+		if (arcmsr_wait_msgint_ready(acb))
+			printk(KERN_NOTICE "arcmsr%d: "
+			       "'set ccb high part physical address' timeout\n",
+				acb->host->host_no);
+	}
+
+	writel(readl(&reg->outbound_intmask) |
+			ARCMSR_MU_OUTBOUND_ALL_INTMASKENABLE,
+	       &reg->outbound_intmask);
+	return 0;
+}
+
+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)
+		goto out;
+	pci_set_master(pdev);
+
+	host = scsi_host_alloc(&arcmsr_scsi_host_template,
+			sizeof(struct AdapterControlBlock));
+	if (!host) {
+		error = -ENOMEM;
+		goto out_disable_device;
+	}
+	acb = (struct AdapterControlBlock *)host->hostdata;
+	memset(acb, 0, sizeof (struct AdapterControlBlock));
+
+	error = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
+	if (error) {
+		error = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (error) {
+			printk(KERN_WARNING
+			       "scsi%d: No suitable DMA mask available\n",
+			       host->host_no);
+			goto out_host_put;
+		}
+	}
+	bus = pdev->bus->number;
+	dev_fun = pdev->devfn;
+	acb->host = host;
+	acb->pdev = pdev;
+	host->max_sectors = ARCMSR_MAX_XFER_SECTORS;
+	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->sg_tablesize = ARCMSR_MAX_SG_ENTRIES;
+	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;
+	host->irq = pdev->irq;
+	error = pci_request_regions(pdev, "arcmsr");
+	if (error)
+		goto out_host_put;
+
+	acb->pmu = ioremap(pci_resource_start(pdev, 0),
+			   pci_resource_len(pdev, 0));
+	if (!acb->pmu) {
+		printk(KERN_NOTICE "arcmsr%d: memory"
+			" mapping region fail \n", acb->host->host_no);
+		goto out_release_regions;
+	}
+	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);
+
+	error = arcmsr_alloc_ccb_pool(acb);
+	if (error)
+		goto out_iounmap;
+
+	error = request_irq(pdev->irq, arcmsr_do_interrupt,
+			SA_INTERRUPT | SA_SHIRQ, "arcmsr", acb);
+	if (error)
+		goto out_free_ccb_pool;
+
+	arcmsr_iop_init(acb);
+	pci_set_drvdata(pdev, host);
+
+	error = scsi_add_host(host, &pdev->dev);
+	if (error)
+		goto out_free_irq;
+
+	error = arcmsr_alloc_sysfs_attr(acb);
+	if (error)
+		goto out_free_sysfs;
+
+	scsi_scan_host(host);
+	return 0;
+ out_free_sysfs:
+ out_free_irq:
+	free_irq(pdev->irq, acb);
+ out_free_ccb_pool:
+	arcmsr_free_ccb_pool(acb);
+ out_iounmap:
+	iounmap(acb->pmu);
+ out_release_regions:
+	pci_release_regions(pdev);
+ out_host_put:
+	scsi_host_put(host);
+ out_disable_device:
+	pci_disable_device(pdev);
+ out:
+	return error;
+}
+
+static void arcmsr_abort_allcmd(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+
+	writel(ARCMSR_INBOUND_MESG0_ABORT_CMD, &reg->inbound_msgaddr0);
+	if (arcmsr_wait_msgint_ready(acb))
+		printk(KERN_NOTICE
+			"arcmsr%d: wait 'abort all outstanding command' timeout \n"
+			, acb->host->host_no);
+}
+
+static void arcmsr_pci_unmap_dma(struct CommandControlBlock *ccb)
+{
+	struct AdapterControlBlock *acb = ccb->acb;
+	struct scsi_cmnd *pcmd = ccb->pcmd;
+
+	if (pcmd->use_sg != 0) {
+		struct scatterlist *sl;
+
+		sl = (struct scatterlist *)pcmd->request_buffer;
+		pci_unmap_sg(acb->pdev, sl, pcmd->use_sg, pcmd->sc_data_direction);
+	}
+	else if (pcmd->request_bufflen != 0)
+		pci_unmap_single(acb->pdev,
+			pcmd->SCp.dma_handle,
+			pcmd->request_bufflen, pcmd->sc_data_direction);
+}
+
+static void arcmsr_ccb_complete(struct CommandControlBlock *ccb, int stand_flag)
+{
+	struct AdapterControlBlock *acb = ccb->acb;
+	struct scsi_cmnd *pcmd = ccb->pcmd;
+
+	arcmsr_pci_unmap_dma(ccb);
+	if (stand_flag == 1)
+		atomic_dec(&acb->ccboutstandingcount);
+	ccb->startdone = ARCMSR_CCB_DONE;
+	ccb->ccb_flags = 0;
+	list_add_tail(&ccb->list, &acb->ccb_free_list);
+	pcmd->scsi_done(pcmd);
+}
+
+static void arcmsr_remove(struct pci_dev *pdev)
+{
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	struct AdapterControlBlock *acb =
+		(struct AdapterControlBlock *) host->hostdata;
+	struct MessageUnit __iomem *reg = acb->pmu;
+	int poll_count = 0;
+
+	arcmsr_free_sysfs_attr(acb);
+	scsi_remove_host(host);
+	arcmsr_stop_adapter_bgrb(acb);
+	arcmsr_flush_adapter_cache(acb);
+	writel(readl(&reg->outbound_intmask) |
+		ARCMSR_MU_OUTBOUND_ALL_INTMASKENABLE,
+		&reg->outbound_intmask);
+	acb->acb_flags |= ACB_F_SCSISTOPADAPTER;
+	acb->acb_flags &= ~ACB_F_IOP_INITED;
+
+	for (poll_count = 0; poll_count < 256; poll_count++) {
+		if (!atomic_read(&acb->ccboutstandingcount))
+			break;
+		arcmsr_interrupt(acb);
+		msleep(25);
+	}
+
+	if (atomic_read(&acb->ccboutstandingcount)) {
+		int i;
+
+		arcmsr_abort_allcmd(acb);
+		for (i = 0; i < ARCMSR_MAX_OUTSTANDING_CMD; i++)
+			readl(&reg->outbound_queueport);
+		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, 1);
+			}
+		}
+	}
+
+	free_irq(pdev->irq, acb);
+	iounmap(acb->pmu);
+	arcmsr_free_ccb_pool(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;
+
+	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 u32 arcmsr_disable_outbound_ints(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	u32 orig_mask = readl(&reg->outbound_intmask);
+
+	writel(orig_mask | ARCMSR_MU_OUTBOUND_ALL_INTMASKENABLE,
+			&reg->outbound_intmask);
+	return orig_mask;
+}
+
+static void arcmsr_enable_outbound_ints(struct AdapterControlBlock *acb,
+		u32 orig_mask)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	u32 mask;
+
+	mask = orig_mask & ~(ARCMSR_MU_OUTBOUND_POSTQUEUE_INTMASKENABLE |
+			     ARCMSR_MU_OUTBOUND_DOORBELL_INTMASKENABLE);
+	writel(mask, &reg->outbound_intmask);
+}
+
+static void arcmsr_flush_adapter_cache(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg=acb->pmu;
+
+	writel(ARCMSR_INBOUND_MESG0_FLUSH_CACHE, &reg->inbound_msgaddr0);
+	if (arcmsr_wait_msgint_ready(acb))
+		printk(KERN_NOTICE
+			"arcmsr%d: wait 'flush adapter cache' timeout \n"
+			, acb->host->host_no);
+}
+
+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) < sizeof (pcmd->sense_buffer)
+			? sizeof (struct SENSE_DATA) : sizeof (pcmd->sense_buffer);
+		memset(sensebuffer, 0, sizeof (pcmd->sense_buffer));
+		memcpy(sensebuffer, ccb->arcmsr_cdb.SenseData, sense_data_length);
+		sensebuffer->ErrorCode = SCSI_SENSE_CURRENT_ERRORS;
+		sensebuffer->Valid = 1;
+	}
+}
+
+static uint8_t arcmsr_wait_msgint_ready(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	uint32_t Index;
+	uint8_t Retries = 0x00;
+
+	do {
+		for (Index = 0; Index < 100; Index++) {
+			if (readl(&reg->outbound_intstatus)
+				& ARCMSR_MU_OUTBOUND_MESSAGE0_INT) {
+				writel(ARCMSR_MU_OUTBOUND_MESSAGE0_INT
+					, &reg->outbound_intstatus);
+				return 0x00;
+			}
+			msleep_interruptible(10);
+		}/*max 1 seconds*/
+	} while (Retries++ < 20);/*max 20 sec*/
+	return 0xff;
+}
+
+static void 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;
+	uint32_t address_lo, address_hi;
+	int arccdbsize = 0x30;
+
+	ccb->pcmd = pcmd;
+	memset(arcmsr_cdb, 0, sizeof (struct ARCMSR_CDB));
+	arcmsr_cdb->Bus = 0;
+	arcmsr_cdb->TargetID = pcmd->device->id;
+	arcmsr_cdb->LUN = pcmd->device->lun;
+	arcmsr_cdb->Function = 1;
+	arcmsr_cdb->CdbLength = (uint8_t)pcmd->cmd_len;
+	arcmsr_cdb->Context = (unsigned long)arcmsr_cdb;
+	memcpy(arcmsr_cdb->Cdb, pcmd->cmnd, pcmd->cmd_len);
+	if (pcmd->use_sg) {
+		int length, sgcount, i, cdb_sgcount = 0;
+		struct scatterlist *sl;
+
+		/* Get Scatter Gather List from scsiport. */
+		sl = (struct scatterlist *) pcmd->request_buffer;
+		sgcount = pci_map_sg(acb->pdev, sl, pcmd->use_sg,
+				pcmd->sc_data_direction);
+		/* map stor port SG list to our iop SG List. */
+		for (i = 0; i < sgcount; i++) {
+			/* Get the physical address of the current data pointer */
+			length = cpu_to_le32(sg_dma_len(sl));
+			address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sl)));
+			address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sl)));
+			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|IS_SG64_ADDR;
+				psge += sizeof (struct SG64ENTRY);
+				arccdbsize += sizeof (struct SG64ENTRY);
+			}
+			sl++;
+			cdb_sgcount++;
+		}
+		arcmsr_cdb->sgcount = (uint8_t)cdb_sgcount;
+		arcmsr_cdb->DataLength = pcmd->request_bufflen;
+		if ( arccdbsize > 256)
+			arcmsr_cdb->Flags |= ARCMSR_CDB_FLAG_SGL_BSIZE;
+	} else if (pcmd->request_bufflen) {
+		dma_addr_t dma_addr;
+		dma_addr = pci_map_single(acb->pdev, pcmd->request_buffer,
+				pcmd->request_bufflen, pcmd->sc_data_direction);
+		pcmd->SCp.dma_handle = dma_addr;
+		address_lo = cpu_to_le32(dma_addr_lo32(dma_addr));
+		address_hi = cpu_to_le32(dma_addr_hi32(dma_addr));
+		if (address_hi == 0) {
+			struct  SG32ENTRY *pdma_sg = (struct SG32ENTRY *)psge;
+			pdma_sg->address = address_lo;
+			pdma_sg->length = pcmd->request_bufflen;
+		} else {
+			struct SG64ENTRY *pdma_sg = (struct SG64ENTRY *)psge;
+			pdma_sg->addresshigh = address_hi;
+			pdma_sg->address = address_lo;
+			pdma_sg->length = pcmd->request_bufflen|IS_SG64_ADDR;
+		}
+		arcmsr_cdb->sgcount = 1;
+		arcmsr_cdb->DataLength = pcmd->request_bufflen;
+	}
+	if (pcmd->sc_data_direction == DMA_TO_DEVICE ) {
+		arcmsr_cdb->Flags |= ARCMSR_CDB_FLAG_WRITE;
+		ccb->ccb_flags |= CCB_FLAG_WRITE;
+	}
+}
+
+static void arcmsr_post_ccb(struct AdapterControlBlock *acb, struct CommandControlBlock *ccb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	uint32_t cdb_shifted_phyaddr = ccb->cdb_shifted_phyaddr;
+	struct ARCMSR_CDB *arcmsr_cdb = (struct ARCMSR_CDB *)&ccb->arcmsr_cdb;
+
+	atomic_inc(&acb->ccboutstandingcount);
+	ccb->startdone = ARCMSR_CCB_START;
+	if (arcmsr_cdb->Flags & ARCMSR_CDB_FLAG_SGL_BSIZE)
+		writel(cdb_shifted_phyaddr | ARCMSR_CCBPOST_FLAG_SGL_BSIZE,
+			&reg->inbound_queueport);
+	else
+		writel(cdb_shifted_phyaddr, &reg->inbound_queueport);
+}
+
+void arcmsr_post_Qbuffer(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	struct QBUFFER __iomem *pwbuffer = (struct QBUFFER __iomem *) &reg->message_wbuffer;
+	uint8_t __iomem *iop_data = (uint8_t __iomem *) pwbuffer->data;
+	int32_t allxfer_len = 0;
+
+	if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_READED) {
+		acb->acb_flags &= (~ACB_F_MESSAGE_WQBUFFER_READED);
+		while ((acb->wqbuf_firstindex != acb->wqbuf_lastindex)
+			&& (allxfer_len < 124)) {
+			writeb(acb->wqbuffer[acb->wqbuf_firstindex], iop_data);
+			acb->wqbuf_firstindex++;
+			acb->wqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
+			iop_data++;
+			allxfer_len++;
+		}
+		writel(allxfer_len, &pwbuffer->data_len);
+		writel(ARCMSR_INBOUND_DRIVER_DATA_WRITE_OK
+			, &reg->inbound_doorbell);
+	}
+}
+
+static void arcmsr_stop_adapter_bgrb(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+
+	acb->acb_flags &= ~ACB_F_MSG_START_BGRB;
+	writel(ARCMSR_INBOUND_MESG0_STOP_BGRB, &reg->inbound_msgaddr0);
+	if (arcmsr_wait_msgint_ready(acb))
+		printk(KERN_NOTICE
+			"arcmsr%d: wait 'stop adapter background rebulid' timeout \n"
+			, acb->host->host_no);
+}
+
+static void arcmsr_free_ccb_pool(struct AdapterControlBlock *acb)
+{
+	dma_free_coherent(&acb->pdev->dev,
+		ARCMSR_MAX_FREECCB_NUM * sizeof (struct CommandControlBlock) + 0x20,
+		acb->dma_coherent,
+		acb->dma_coherent_handle);
+}
+
+static irqreturn_t arcmsr_interrupt(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	struct CommandControlBlock *ccb;
+	uint32_t flag_ccb, outbound_intstatus, outbound_doorbell;
+
+	outbound_intstatus = readl(&reg->outbound_intstatus)
+		& acb->outbound_int_enable;
+	writel(outbound_intstatus, &reg->outbound_intstatus);
+	if (outbound_intstatus & ARCMSR_MU_OUTBOUND_DOORBELL_INT) {
+		outbound_doorbell = readl(&reg->outbound_doorbell);
+		writel(outbound_doorbell, &reg->outbound_doorbell);
+		if (outbound_doorbell & ARCMSR_OUTBOUND_IOP331_DATA_WRITE_OK) {
+			struct QBUFFER __iomem * prbuffer =
+				(struct QBUFFER __iomem *) &reg->message_rbuffer;
+			uint8_t __iomem * iop_data = (uint8_t __iomem *)prbuffer->data;
+			int32_t my_empty_len, iop_len, rqbuf_firstindex, rqbuf_lastindex;
+
+			rqbuf_lastindex = acb->rqbuf_lastindex;
+			rqbuf_firstindex = acb->rqbuf_firstindex;
+			iop_len = readl(&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) {
+					acb->rqbuffer[acb->rqbuf_lastindex] = readb(iop_data);
+					acb->rqbuf_lastindex++;
+					acb->rqbuf_lastindex %= ARCMSR_MAX_QBUFFER;
+					iop_data++;
+					iop_len--;
+				}
+				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK,
+					&reg->inbound_doorbell);
+			} else
+				acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW;
+		}
+		if (outbound_doorbell & ARCMSR_OUTBOUND_IOP331_DATA_READ_OK) {
+			acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_READED;
+			if (acb->wqbuf_firstindex != acb->wqbuf_lastindex) {
+				struct QBUFFER __iomem * pwbuffer =
+						(struct QBUFFER __iomem *) &reg->message_wbuffer;
+				uint8_t __iomem * iop_data = (uint8_t __iomem *) pwbuffer->data;
+				int32_t allxfer_len = 0;
+
+				acb->acb_flags &= (~ACB_F_MESSAGE_WQBUFFER_READED);
+				while ((acb->wqbuf_firstindex != acb->wqbuf_lastindex)
+					&& (allxfer_len < 124)) {
+					writeb(acb->wqbuffer[acb->wqbuf_firstindex], iop_data);
+					acb->wqbuf_firstindex++;
+					acb->wqbuf_firstindex %= ARCMSR_MAX_QBUFFER;
+					iop_data++;
+					allxfer_len++;
+				}
+				writel(allxfer_len, &pwbuffer->data_len);
+				writel(ARCMSR_INBOUND_DRIVER_DATA_WRITE_OK,
+					&reg->inbound_doorbell);
+			}
+			if (acb->wqbuf_firstindex == acb->wqbuf_lastindex)
+				acb->acb_flags |= ACB_F_MESSAGE_WQBUFFER_CLEARED;
+		}
+	}
+	if (outbound_intstatus & ARCMSR_MU_OUTBOUND_POSTQUEUE_INT) {
+		int id, lun;
+		/*
+		****************************************************************
+		**               areca cdb command done
+		****************************************************************
+		*/
+		while (1) {
+			if ((flag_ccb = readl(&reg->outbound_queueport)) == 0xFFFFFFFF)
+				break;/*chip FIFO no ccb for completion already*/
+			/* check if command done with no error*/
+			ccb = (struct CommandControlBlock *)(acb->vir2phy_offset +
+				(flag_ccb << 5));
+			if ((ccb->acb != acb) || (ccb->startdone != ARCMSR_CCB_START)) {
+				if (ccb->startdone == ARCMSR_CCB_ABORTED) {
+					struct scsi_cmnd *abortcmd=ccb->pcmd;
+					if (abortcmd) {
+					abortcmd->result |= DID_ABORT >> 16;
+					arcmsr_ccb_complete(ccb, 1);
+					printk(KERN_NOTICE
+						"arcmsr%d: ccb='0x%p' isr got aborted command \n"
+						, acb->host->host_no, ccb);
+					}
+					continue;
+				}
+				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
+					, ccb
+					, ccb->acb
+					, ccb->startdone
+					, atomic_read(&acb->ccboutstandingcount));
+				continue;
+			}
+			id = ccb->pcmd->device->id;
+			lun = ccb->pcmd->device->lun;
+			if (!(flag_ccb & ARCMSR_CCBREPLY_FLAG_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, 1);
+			} else {
+				switch(ccb->arcmsr_cdb.DeviceStatus) {
+				case ARCMSR_DEV_SELECT_TIMEOUT: {
+						acb->devstate[id][lun] = ARECA_RAID_GONE;
+						ccb->pcmd->result = DID_TIME_OUT << 16;
+						arcmsr_ccb_complete(ccb, 1);
+					}
+					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, 1);
+					}
+					break;
+				case ARCMSR_DEV_CHECK_CONDITION: {
+						acb->devstate[id][lun] = ARECA_RAID_GOOD;
+						arcmsr_report_sense_info(ccb);
+						arcmsr_ccb_complete(ccb, 1);
+					}
+					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, 1);
+					break;
+				}
+			}
+		}/*drain reply FIFO*/
+	}
+	if (!(outbound_intstatus & ARCMSR_MU_OUTBOUND_HANDLE_INT))
+		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) {
+			acb->acb_flags &= ~ACB_F_MSG_START_BGRB;
+			arcmsr_stop_adapter_bgrb(acb);
+			arcmsr_flush_adapter_cache(acb);
+		}
+	}
+}
+
+static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb, struct scsi_cmnd *cmd)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	struct CMD_MESSAGE_FIELD *pcmdmessagefld;
+	int retvalue = 0, transfer_len = 0;
+	char *buffer;
+	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 */
+	if (cmd->use_sg) {
+		struct scatterlist *sg = (struct scatterlist *)cmd->request_buffer;
+
+		buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+		if (cmd->use_sg > 1) {
+			retvalue = ARCMSR_MESSAGE_FAIL;
+			goto message_out;
+		}
+		transfer_len += sg->length;
+	} else {
+		buffer = cmd->request_buffer;
+		transfer_len = cmd->request_bufflen;
+	}
+	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 long *ver_addr;
+			dma_addr_t buf_handle;
+			uint8_t *pQbuffer, *ptmpQbuffer;
+			int32_t allxfer_len = 0;
+
+			ver_addr = pci_alloc_consistent(acb->pdev, 1032, &buf_handle);
+			if (!ver_addr) {
+				retvalue = ARCMSR_MESSAGE_FAIL;
+				goto message_out;
+			}
+			ptmpQbuffer = (uint8_t *) 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 = (struct QBUFFER __iomem *)
+							&reg->message_rbuffer;
+				uint8_t __iomem * iop_data = (uint8_t __iomem *)prbuffer->data;
+				int32_t iop_len;
+
+				acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
+				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--;
+				}
+				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK,
+						&reg->inbound_doorbell);
+			}
+			memcpy(pcmdmessagefld->messagedatabuffer,
+				(uint8_t *)ver_addr, allxfer_len);
+			pcmdmessagefld->cmdmessage.Length = allxfer_len;
+			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_OK;
+			pci_free_consistent(acb->pdev, 1032, ver_addr, buf_handle);
+		}
+		break;
+	case ARCMSR_MESSAGE_WRITE_WQBUFFER: {
+			unsigned long *ver_addr;
+			dma_addr_t buf_handle;
+			int32_t my_empty_len, user_len, wqbuf_firstindex, wqbuf_lastindex;
+			uint8_t *pQbuffer, *ptmpuserbuffer;
+
+			ver_addr = pci_alloc_consistent(acb->pdev, 1032, &buf_handle);
+			if (!ver_addr) {
+				retvalue = ARCMSR_MESSAGE_FAIL;
+				goto message_out;
+			}
+			ptmpuserbuffer = (uint8_t *)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_Qbuffer(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_Qbuffer(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;
+				}
+			}
+			pci_free_consistent(acb->pdev, 1032, ver_addr, buf_handle);
+		}
+		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;
+				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK,
+					&reg->inbound_doorbell);
+			}
+			acb->acb_flags |= ACB_F_MESSAGE_RQBUFFER_CLEARED;
+			acb->rqbuf_firstindex = 0;
+			acb->rqbuf_lastindex = 0;
+			memset(pQbuffer, 0, ARCMSR_MAX_QBUFFER);
+			pcmdmessagefld->cmdmessage.ReturnCode =
+				ARCMSR_MESSAGE_RETURNCODE_OK;
+		}
+		break;
+	case ARCMSR_MESSAGE_CLEAR_WQBUFFER: {
+			uint8_t *pQbuffer = acb->wqbuffer;
+
+			if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
+				acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
+				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK
+						, &reg->inbound_doorbell);
+			}
+			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);
+			pcmdmessagefld->cmdmessage.ReturnCode =
+				ARCMSR_MESSAGE_RETURNCODE_OK;
+		}
+		break;
+	case ARCMSR_MESSAGE_CLEAR_ALLQBUFFER: {
+			uint8_t *pQbuffer;
+
+			if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
+				acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
+				writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK
+						, &reg->inbound_doorbell);
+			}
+			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));
+			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_OK;
+		}
+		break;
+	case ARCMSR_MESSAGE_RETURN_CODE_3F: {
+			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_3F;
+		}
+		break;
+	case ARCMSR_MESSAGE_SAY_HELLO: {
+			int8_t * hello_string = "Hello! I am ARCMSR";
+
+			memcpy(pcmdmessagefld->messagedatabuffer, hello_string
+				, (int16_t)strlen(hello_string));
+			pcmdmessagefld->cmdmessage.ReturnCode = ARCMSR_MESSAGE_RETURNCODE_OK;
+		}
+		break;
+	case ARCMSR_MESSAGE_SAY_GOODBYE:
+		arcmsr_iop_parking(acb);
+		break;
+	case ARCMSR_MESSAGE_FLUSH_ADAPTER_CACHE:
+		arcmsr_flush_adapter_cache(acb);
+		break;
+	default:
+		retvalue = ARCMSR_MESSAGE_FAIL;
+	}
+ message_out:
+	if (cmd->use_sg) {
+		struct scatterlist *sg;
+
+		sg = (struct scatterlist *) cmd->request_buffer;
+		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;
+
+	if (!list_empty(head)) {
+		ccb = list_entry(head->next, struct CommandControlBlock, list);
+		list_del(head->next);
+	}
+	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;
+
+		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 */
+		if (cmd->use_sg) {
+			struct scatterlist *sg;
+
+			sg = (struct scatterlist *) cmd->request_buffer;
+			buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+		} else {
+			buffer = cmd->request_buffer;
+		}
+		memcpy(buffer, inqdata, sizeof(inqdata));
+		if (cmd->use_sg) {
+			struct scatterlist *sg;
+
+			sg = (struct scatterlist *) cmd->request_buffer;
+			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(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;
+
+	cmd->scsi_done = done;
+	cmd->host_scribble = NULL;
+	cmd->result = 0;
+	if (acb->acb_flags & ACB_F_BUS_RESET) {
+		printk(KERN_NOTICE "arcmsr%d: bus reset"
+			" and return busy \n"
+			, acb->host->host_no);
+		return SCSI_MLQUEUE_HOST_BUSY;
+	}
+	if(target == 16) {
+		/* virtual device for iop message transfer */
+		arcmsr_handle_virtual_command(acb, cmd);
+		return 0;
+	}
+	if (acb->devstate[target][lun] == ARECA_RAID_GONE) {
+		uint8_t block_cmd;
+
+		block_cmd = cmd->cmnd[0] & 0x0f;
+		if (block_cmd == 0x08 || block_cmd == 0x0a) {
+			printk(KERN_NOTICE
+				"arcmsr%d: block 'read/write'"
+				"command with gone raid volume"
+				" Cmd=%2x, TargetId=%d, Lun=%d \n"
+				, acb->host->host_no
+				, cmd->cmnd[0]
+				, target, lun);
+			cmd->result = (DID_NO_CONNECT << 16);
+			cmd->scsi_done(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;
+	arcmsr_build_ccb(acb, ccb, cmd);
+	arcmsr_post_ccb(acb, ccb);
+	return 0;
+}
+
+static void arcmsr_get_firmware_spec(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	char *acb_firm_model = acb->firm_model;
+	char *acb_firm_version = acb->firm_version;
+	char __iomem *iop_firm_model = (char __iomem *) &reg->message_rwbuffer[15];
+	char __iomem *iop_firm_version = (char __iomem *) &reg->message_rwbuffer[17];
+	int count;
+
+	writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
+	if (arcmsr_wait_msgint_ready(acb))
+		printk(KERN_NOTICE
+			"arcmsr%d: wait "
+			"'get adapter firmware miscellaneous data' timeout \n"
+			, acb->host->host_no);
+	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_INFO
+		"ARECA RAID ADAPTER%d: FIRMWARE VERSION %s \n"
+		, acb->host->host_no
+		, acb->firm_version);
+	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]);
+}
+
+static void arcmsr_polling_ccbdone(struct AdapterControlBlock *acb,
+	struct CommandControlBlock *poll_ccb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	struct CommandControlBlock *ccb;
+	uint32_t flag_ccb, outbound_intstatus, poll_ccb_done = 0, poll_count = 0;
+	int id, lun;
+
+ polling_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)
+				break;
+			else {
+				msleep(25);
+				if (poll_count > 100)
+					break;
+				goto polling_ccb_retry;
+			}
+		}
+		ccb = (struct CommandControlBlock *)
+			(acb->vir2phy_offset + (flag_ccb << 5));
+		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, 1);
+				poll_ccb_done = 1;
+				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;
+		}
+		id = ccb->pcmd->device->id;
+		lun = ccb->pcmd->device->lun;
+		if (!(flag_ccb & ARCMSR_CCBREPLY_FLAG_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, 1);
+		} else {
+			switch(ccb->arcmsr_cdb.DeviceStatus) {
+			case ARCMSR_DEV_SELECT_TIMEOUT: {
+					acb->devstate[id][lun] = ARECA_RAID_GONE;
+					ccb->pcmd->result = DID_TIME_OUT << 16;
+					arcmsr_ccb_complete(ccb, 1);
+				}
+				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, 1);
+				}
+				break;
+			case ARCMSR_DEV_CHECK_CONDITION: {
+					acb->devstate[id][lun] = ARECA_RAID_GOOD;
+					arcmsr_report_sense_info(ccb);
+					arcmsr_ccb_complete(ccb, 1);
+				}
+				break;
+			default:
+				printk(KERN_NOTICE
+					"arcmsr%d: scsi id=%d lun=%d"
+					" polling and getting 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_BAD_TARGET << 16;
+				arcmsr_ccb_complete(ccb, 1);
+				break;
+			}
+		}
+	}
+}
+
+static void arcmsr_iop_init(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	uint32_t intmask_org, mask, outbound_doorbell, firmware_state = 0;
+
+	do {
+		firmware_state = readl(&reg->outbound_msgaddr1);
+	} while (!(firmware_state & ARCMSR_OUTBOUND_MESG1_FIRMWARE_OK));
+	intmask_org = readl(&reg->outbound_intmask)
+			| ARCMSR_MU_OUTBOUND_MESSAGE0_INTMASKENABLE;
+	arcmsr_get_firmware_spec(acb);
+
+	acb->acb_flags |= ACB_F_MSG_START_BGRB;
+	writel(ARCMSR_INBOUND_MESG0_START_BGRB, &reg->inbound_msgaddr0);
+	if (arcmsr_wait_msgint_ready(acb)) {
+		printk(KERN_NOTICE "arcmsr%d: "
+			"wait 'start adapter background rebulid' timeout\n",
+			acb->host->host_no);
+	}
+
+	outbound_doorbell = readl(&reg->outbound_doorbell);
+	writel(outbound_doorbell, &reg->outbound_doorbell);
+	writel(ARCMSR_INBOUND_DRIVER_DATA_READ_OK, &reg->inbound_doorbell);
+	mask = ~(ARCMSR_MU_OUTBOUND_POSTQUEUE_INTMASKENABLE
+			| ARCMSR_MU_OUTBOUND_DOORBELL_INTMASKENABLE);
+	writel(intmask_org & mask, &reg->outbound_intmask);
+	acb->outbound_int_enable = ~(intmask_org & mask) & 0x000000ff;
+	acb->acb_flags |= ACB_F_IOP_INITED;
+}
+
+static void arcmsr_iop_reset(struct AdapterControlBlock *acb)
+{
+	struct MessageUnit __iomem *reg = acb->pmu;
+	struct CommandControlBlock *ccb;
+	uint32_t intmask_org;
+	int i = 0;
+
+	if (atomic_read(&acb->ccboutstandingcount) != 0) {
+		/* talk to iop 331 outstanding command aborted */
+		arcmsr_abort_allcmd(acb);
+		/* wait for 3 sec for all command aborted*/
+		msleep_interruptible(3000);
+		/* disable all outbound interrupt */
+		intmask_org = arcmsr_disable_outbound_ints(acb);
+		/* clear all outbound posted Q */
+		for (i = 0; i < ARCMSR_MAX_OUTSTANDING_CMD; i++)
+			readl(&reg->outbound_queueport);
+		for (i = 0; i < ARCMSR_MAX_FREECCB_NUM; i++) {
+			ccb = acb->pccb_pool[i];
+			if ((ccb->startdone == ARCMSR_CCB_START) ||
+				(ccb->startdone == ARCMSR_CCB_ABORTED)) {
+				ccb->startdone = ARCMSR_CCB_ABORTED;
+				ccb->pcmd->result = DID_ABORT << 16;
+				arcmsr_ccb_complete(ccb, 1);
+			}
+		}
+		/* enable all outbound interrupt */
+		arcmsr_enable_outbound_ints(acb, intmask_org);
+	}
+	atomic_set(&acb->ccboutstandingcount, 0);
+}
+
+static int arcmsr_bus_reset(struct scsi_cmnd *cmd)
+{
+	struct AdapterControlBlock *acb =
+		(struct AdapterControlBlock *)cmd->device->host->hostdata;
+	int i;
+
+	acb->num_resets++;
+	acb->acb_flags |= ACB_F_BUS_RESET;
+	for (i = 0; i < 400; i++) {
+		if (!atomic_read(&acb->ccboutstandingcount))
+			break;
+		arcmsr_interrupt(acb);
+		msleep(25);
+	}
+	arcmsr_iop_reset(acb);
+	acb->acb_flags &= ~ACB_F_BUS_RESET;
+	return SUCCESS;
+}
+
+static void arcmsr_abort_one_cmd(struct AdapterControlBlock *acb,
+		struct CommandControlBlock *ccb)
+{
+	u32 intmask;
+
+	ccb->startdone = ARCMSR_CCB_ABORTED;
+
+	/*
+	** Wait for 3 sec for all command done.
+	*/
+	msleep_interruptible(3000);
+
+	intmask = arcmsr_disable_outbound_ints(acb);
+	arcmsr_polling_ccbdone(acb, ccb);
+	arcmsr_enable_outbound_ints(acb, intmask);
+}
+
+static int arcmsr_abort(struct scsi_cmnd *cmd)
+{
+	struct AdapterControlBlock *acb =
+		(struct AdapterControlBlock *)cmd->device->host->hostdata;
+	int i = 0;
+
+	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->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 SUCCESS;
+
+	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) {
+			arcmsr_abort_one_cmd(acb, ccb);
+			break;
+		}
+	}
+
+	return SUCCESS;
+}
+
+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_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_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:
+		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;
+}
+
+