[SCSI] 3w-sas: Add new driver for LSI 3ware 9750

[jejb: fix up for new queue depth code]
Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 1924 insertions, 0 deletions

diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
new file mode 100644
index 000000000000..4d314d740de4
--- /dev/null
+++ b/drivers/scsi/3w-sas.c
@@ -0,0 +1,1924 @@
+/*
+   3w-sas.c -- LSI 3ware SAS/SATA-RAID Controller device driver for Linux.
+
+   Written By: Adam Radford <linuxraid@lsi.com>
+
+   Copyright (C) 2009 LSI Corporation.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   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.
+
+   NO WARRANTY
+   THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
+   LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
+   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
+   solely responsible for determining the appropriateness of using and
+   distributing the Program and assumes all risks associated with its
+   exercise of rights under this Agreement, including but not limited to
+   the risks and costs of program errors, damage to or loss of data,
+   programs or equipment, and unavailability or interruption of operations.
+
+   DISCLAIMER OF LIABILITY
+   NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
+   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
+   HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   Controllers supported by this driver:
+
+   LSI 3ware 9750 6Gb/s SAS/SATA-RAID
+
+   Bugs/Comments/Suggestions should be mailed to:
+   linuxraid@lsi.com
+
+   For more information, goto:
+   http://www.lsi.com
+
+   History
+   -------
+   3.26.02.000 - Initial driver release.
+*/
+
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <linux/mutex.h>
+#include <linux/smp_lock.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_cmnd.h>
+#include "3w-sas.h"
+
+/* Globals */
+#define TW_DRIVER_VERSION "3.26.02.000"
+static TW_Device_Extension *twl_device_extension_list[TW_MAX_SLOT];
+static unsigned int twl_device_extension_count;
+static int twl_major = -1;
+extern struct timezone sys_tz;
+
+/* Module parameters */
+MODULE_AUTHOR ("LSI");
+MODULE_DESCRIPTION ("LSI 3ware SAS/SATA-RAID Linux Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(TW_DRIVER_VERSION);
+
+static int use_msi;
+module_param(use_msi, int, S_IRUGO);
+MODULE_PARM_DESC(use_msi, "Use Message Signaled Interrupts. Default: 0");
+
+/* Function prototypes */
+static int twl_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset);
+
+/* Functions */
+
+/* This function returns AENs through sysfs */
+static ssize_t twl_sysfs_aen_read(struct kobject *kobj,
+				  struct bin_attribute *bin_attr,
+				  char *outbuf, loff_t offset, size_t count)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct Scsi_Host *shost = class_to_shost(dev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)shost->hostdata;
+	unsigned long flags = 0;
+	ssize_t ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+	ret = memory_read_from_buffer(outbuf, count, &offset, tw_dev->event_queue[0], sizeof(TW_Event) * TW_Q_LENGTH);
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+	return ret;
+} /* End twl_sysfs_aen_read() */
+
+/* aen_read sysfs attribute initializer */
+static struct bin_attribute twl_sysfs_aen_read_attr = {
+	.attr = {
+		.name = "3ware_aen_read",
+		.mode = S_IRUSR,
+	}, 
+	.size = 0,
+	.read = twl_sysfs_aen_read
+};
+
+/* This function returns driver compatibility info through sysfs */
+static ssize_t twl_sysfs_compat_info(struct kobject *kobj,
+				     struct bin_attribute *bin_attr,
+				     char *outbuf, loff_t offset, size_t count)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct Scsi_Host *shost = class_to_shost(dev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)shost->hostdata;
+	unsigned long flags = 0;
+	ssize_t ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+	ret = memory_read_from_buffer(outbuf, count, &offset, &tw_dev->tw_compat_info, sizeof(TW_Compatibility_Info));
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+	return ret;
+} /* End twl_sysfs_compat_info() */
+
+/* compat_info sysfs attribute initializer */
+static struct bin_attribute twl_sysfs_compat_info_attr = {
+	.attr = {
+		.name = "3ware_compat_info",
+		.mode = S_IRUSR,
+	}, 
+	.size = 0,
+	.read = twl_sysfs_compat_info
+};
+
+/* Show some statistics about the card */
+static ssize_t twl_show_stats(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *host = class_to_shost(dev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+	unsigned long flags = 0;
+	ssize_t len;
+
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+	len = snprintf(buf, PAGE_SIZE, "3w-sas Driver version: %s\n"
+		       "Current commands posted:   %4d\n"
+		       "Max commands posted:       %4d\n"
+		       "Last sgl length:           %4d\n"
+		       "Max sgl length:            %4d\n"
+		       "Last sector count:         %4d\n"
+		       "Max sector count:          %4d\n"
+		       "SCSI Host Resets:          %4d\n"
+		       "AEN's:                     %4d\n", 
+		       TW_DRIVER_VERSION,
+		       tw_dev->posted_request_count,
+		       tw_dev->max_posted_request_count,
+		       tw_dev->sgl_entries,
+		       tw_dev->max_sgl_entries,
+		       tw_dev->sector_count,
+		       tw_dev->max_sector_count,
+		       tw_dev->num_resets,
+		       tw_dev->aen_count);
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+	return len;
+} /* End twl_show_stats() */
+
+/* This function will set a devices queue depth */
+static int twl_change_queue_depth(struct scsi_device *sdev, int queue_depth,
+				  int reason)
+{
+	if (reason != SCSI_QDEPTH_DEFAULT)
+		return -EOPNOTSUPP;
+
+	if (queue_depth > TW_Q_LENGTH-2)
+		queue_depth = TW_Q_LENGTH-2;
+	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	return queue_depth;
+} /* End twl_change_queue_depth() */
+
+/* stats sysfs attribute initializer */
+static struct device_attribute twl_host_stats_attr = {
+	.attr = {
+		.name = 	"3ware_stats",
+		.mode =		S_IRUGO,
+	},
+	.show = twl_show_stats
+};
+
+/* Host attributes initializer */
+static struct device_attribute *twl_host_attrs[] = {
+	&twl_host_stats_attr,
+	NULL,
+};
+
+/* This function will look up an AEN severity string */
+static char *twl_aen_severity_lookup(unsigned char severity_code)
+{
+	char *retval = NULL;
+
+	if ((severity_code < (unsigned char) TW_AEN_SEVERITY_ERROR) ||
+	    (severity_code > (unsigned char) TW_AEN_SEVERITY_DEBUG))
+		goto out;
+
+	retval = twl_aen_severity_table[severity_code];
+out:
+	return retval;
+} /* End twl_aen_severity_lookup() */
+
+/* This function will queue an event */
+static void twl_aen_queue_event(TW_Device_Extension *tw_dev, TW_Command_Apache_Header *header)
+{
+	u32 local_time;
+	struct timeval time;
+	TW_Event *event;
+	unsigned short aen;
+	char host[16];
+	char *error_str;
+
+	tw_dev->aen_count++;
+
+	/* Fill out event info */
+	event = tw_dev->event_queue[tw_dev->error_index];
+
+	host[0] = '\0';
+	if (tw_dev->host)
+		sprintf(host, " scsi%d:", tw_dev->host->host_no);
+
+	aen = le16_to_cpu(header->status_block.error);
+	memset(event, 0, sizeof(TW_Event));
+
+	event->severity = TW_SEV_OUT(header->status_block.severity__reserved);
+	do_gettimeofday(&time);
+	local_time = (u32)(time.tv_sec - (sys_tz.tz_minuteswest * 60));
+	event->time_stamp_sec = local_time;
+	event->aen_code = aen;
+	event->retrieved = TW_AEN_NOT_RETRIEVED;
+	event->sequence_id = tw_dev->error_sequence_id;
+	tw_dev->error_sequence_id++;
+
+	/* Check for embedded error string */
+	error_str = &(header->err_specific_desc[strlen(header->err_specific_desc)+1]);
+
+	header->err_specific_desc[sizeof(header->err_specific_desc) - 1] = '\0';
+	event->parameter_len = strlen(header->err_specific_desc);
+	memcpy(event->parameter_data, header->err_specific_desc, event->parameter_len + 1 + strlen(error_str));
+	if (event->severity != TW_AEN_SEVERITY_DEBUG)
+		printk(KERN_WARNING "3w-sas:%s AEN: %s (0x%02X:0x%04X): %s:%s.\n",
+		       host,
+		       twl_aen_severity_lookup(TW_SEV_OUT(header->status_block.severity__reserved)),
+		       TW_MESSAGE_SOURCE_CONTROLLER_EVENT, aen, error_str,
+		       header->err_specific_desc);
+	else
+		tw_dev->aen_count--;
+
+	tw_dev->error_index = (tw_dev->error_index + 1 ) % TW_Q_LENGTH;
+} /* End twl_aen_queue_event() */
+
+/* This function will attempt to post a command packet to the board */
+static int twl_post_command_packet(TW_Device_Extension *tw_dev, int request_id)
+{
+	dma_addr_t command_que_value;
+
+	command_que_value = tw_dev->command_packet_phys[request_id];
+	command_que_value += TW_COMMAND_OFFSET;
+
+	/* First write upper 4 bytes */
+	writel((u32)((u64)command_que_value >> 32), TWL_HIBQPH_REG_ADDR(tw_dev));
+	/* Then the lower 4 bytes */
+	writel((u32)(command_que_value | TWL_PULL_MODE), TWL_HIBQPL_REG_ADDR(tw_dev));
+
+	tw_dev->state[request_id] = TW_S_POSTED;
+	tw_dev->posted_request_count++;
+	if (tw_dev->posted_request_count > tw_dev->max_posted_request_count)
+		tw_dev->max_posted_request_count = tw_dev->posted_request_count;
+
+	return 0;
+} /* End twl_post_command_packet() */
+
+/* This function will perform a pci-dma mapping for a scatter gather list */
+static int twl_map_scsi_sg_data(TW_Device_Extension *tw_dev, int request_id)
+{
+	int use_sg;
+	struct scsi_cmnd *cmd = tw_dev->srb[request_id];
+
+	use_sg = scsi_dma_map(cmd);
+	if (!use_sg)
+		return 0;
+	else if (use_sg < 0) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1, "Failed to map scatter gather list");
+		return 0;
+	}
+
+	cmd->SCp.phase = TW_PHASE_SGLIST;
+	cmd->SCp.have_data_in = use_sg;
+
+	return use_sg;
+} /* End twl_map_scsi_sg_data() */
+
+/* This function hands scsi cdb's to the firmware */
+static int twl_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry_ISO *sglistarg)
+{
+	TW_Command_Full *full_command_packet;
+	TW_Command_Apache *command_packet;
+	int i, sg_count;
+	struct scsi_cmnd *srb = NULL;
+	struct scatterlist *sglist = NULL, *sg;
+	int retval = 1;
+
+	if (tw_dev->srb[request_id]) {
+		srb = tw_dev->srb[request_id];
+		if (scsi_sglist(srb))
+			sglist = scsi_sglist(srb);
+	}
+
+	/* Initialize command packet */
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	full_command_packet->header.header_desc.size_header = 128;
+	full_command_packet->header.status_block.error = 0;
+	full_command_packet->header.status_block.severity__reserved = 0;
+
+	command_packet = &full_command_packet->command.newcommand;
+	command_packet->status = 0;
+	command_packet->opcode__reserved = TW_OPRES_IN(0, TW_OP_EXECUTE_SCSI);
+
+	/* We forced 16 byte cdb use earlier */
+	if (!cdb)
+		memcpy(command_packet->cdb, srb->cmnd, TW_MAX_CDB_LEN);
+	else
+		memcpy(command_packet->cdb, cdb, TW_MAX_CDB_LEN);
+
+	if (srb) {
+		command_packet->unit = srb->device->id;
+		command_packet->request_id__lunl =
+			cpu_to_le16(TW_REQ_LUN_IN(srb->device->lun, request_id));
+	} else {
+		command_packet->request_id__lunl =
+			cpu_to_le16(TW_REQ_LUN_IN(0, request_id));
+		command_packet->unit = 0;
+	}
+
+	command_packet->sgl_offset = 16;
+
+	if (!sglistarg) {
+		/* Map sglist from scsi layer to cmd packet */
+		if (scsi_sg_count(srb)) {
+			sg_count = twl_map_scsi_sg_data(tw_dev, request_id);
+			if (sg_count == 0)
+				goto out;
+
+			scsi_for_each_sg(srb, sg, sg_count, i) {
+				command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(sg));
+				command_packet->sg_list[i].length = TW_CPU_TO_SGL(sg_dma_len(sg));
+			}
+			command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN((srb->device->lun >> 4), scsi_sg_count(tw_dev->srb[request_id])));
+		}
+	} else {
+		/* Internal cdb post */
+		for (i = 0; i < use_sg; i++) {
+			command_packet->sg_list[i].address = TW_CPU_TO_SGL(sglistarg[i].address);
+			command_packet->sg_list[i].length = TW_CPU_TO_SGL(sglistarg[i].length);
+		}
+		command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN(0, use_sg));
+	}
+
+	/* Update some stats */
+	if (srb) {
+		tw_dev->sector_count = scsi_bufflen(srb) / 512;
+		if (tw_dev->sector_count > tw_dev->max_sector_count)
+			tw_dev->max_sector_count = tw_dev->sector_count;
+		tw_dev->sgl_entries = scsi_sg_count(srb);
+		if (tw_dev->sgl_entries > tw_dev->max_sgl_entries)
+			tw_dev->max_sgl_entries = tw_dev->sgl_entries;
+	}
+
+	/* Now post the command to the board */
+	retval = twl_post_command_packet(tw_dev, request_id);
+
+out:
+	return retval;
+} /* End twl_scsiop_execute_scsi() */
+
+/* This function will read the aen queue from the isr */
+static int twl_aen_read_queue(TW_Device_Extension *tw_dev, int request_id)
+{
+	char cdb[TW_MAX_CDB_LEN];
+	TW_SG_Entry_ISO sglist[1];
+	TW_Command_Full *full_command_packet;
+	int retval = 1;
+
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	memset(full_command_packet, 0, sizeof(TW_Command_Full));
+
+	/* Initialize cdb */
+	memset(&cdb, 0, TW_MAX_CDB_LEN);
+	cdb[0] = REQUEST_SENSE; /* opcode */
+	cdb[4] = TW_ALLOCATION_LENGTH; /* allocation length */
+
+	/* Initialize sglist */
+	memset(&sglist, 0, sizeof(TW_SG_Entry_ISO));
+	sglist[0].length = TW_SECTOR_SIZE;
+	sglist[0].address = tw_dev->generic_buffer_phys[request_id];
+
+	/* Mark internal command */
+	tw_dev->srb[request_id] = NULL;
+
+	/* Now post the command packet */
+	if (twl_scsiop_execute_scsi(tw_dev, request_id, cdb, 1, sglist)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x2, "Post failed while reading AEN queue");
+		goto out;
+	}
+	retval = 0;
+out:
+	return retval;
+} /* End twl_aen_read_queue() */
+
+/* This function will sync firmware time with the host time */
+static void twl_aen_sync_time(TW_Device_Extension *tw_dev, int request_id)
+{
+	u32 schedulertime;
+	struct timeval utc;
+	TW_Command_Full *full_command_packet;
+	TW_Command *command_packet;
+	TW_Param_Apache *param;
+	u32 local_time;
+
+	/* Fill out the command packet */
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	memset(full_command_packet, 0, sizeof(TW_Command_Full));
+	command_packet = &full_command_packet->command.oldcommand;
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_SET_PARAM);
+	command_packet->request_id = request_id;
+	command_packet->byte8_offset.param.sgl[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
+	command_packet->byte8_offset.param.sgl[0].length = TW_CPU_TO_SGL(TW_SECTOR_SIZE);
+	command_packet->size = TW_COMMAND_SIZE;
+	command_packet->byte6_offset.parameter_count = cpu_to_le16(1);
+
+	/* Setup the param */
+	param = (TW_Param_Apache *)tw_dev->generic_buffer_virt[request_id];
+	memset(param, 0, TW_SECTOR_SIZE);
+	param->table_id = cpu_to_le16(TW_TIMEKEEP_TABLE | 0x8000); /* Controller time keep table */
+	param->parameter_id = cpu_to_le16(0x3); /* SchedulerTime */
+	param->parameter_size_bytes = cpu_to_le16(4);
+
+	/* Convert system time in UTC to local time seconds since last 
+           Sunday 12:00AM */
+	do_gettimeofday(&utc);
+	local_time = (u32)(utc.tv_sec - (sys_tz.tz_minuteswest * 60));
+	schedulertime = local_time - (3 * 86400);
+	schedulertime = cpu_to_le32(schedulertime % 604800);
+
+	memcpy(param->data, &schedulertime, sizeof(u32));
+
+	/* Mark internal command */
+	tw_dev->srb[request_id] = NULL;
+
+	/* Now post the command */
+	twl_post_command_packet(tw_dev, request_id);
+} /* End twl_aen_sync_time() */
+
+/* This function will assign an available request id */
+static void twl_get_request_id(TW_Device_Extension *tw_dev, int *request_id)
+{
+	*request_id = tw_dev->free_queue[tw_dev->free_head];
+	tw_dev->free_head = (tw_dev->free_head + 1) % TW_Q_LENGTH;
+	tw_dev->state[*request_id] = TW_S_STARTED;
+} /* End twl_get_request_id() */
+
+/* This function will free a request id */
+static void twl_free_request_id(TW_Device_Extension *tw_dev, int request_id)
+{
+	tw_dev->free_queue[tw_dev->free_tail] = request_id;
+	tw_dev->state[request_id] = TW_S_FINISHED;
+	tw_dev->free_tail = (tw_dev->free_tail + 1) % TW_Q_LENGTH;
+} /* End twl_free_request_id() */
+
+/* This function will complete an aen request from the isr */
+static int twl_aen_complete(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Command_Full *full_command_packet;
+	TW_Command *command_packet;
+	TW_Command_Apache_Header *header;
+	unsigned short aen;
+	int retval = 1;
+
+	header = (TW_Command_Apache_Header *)tw_dev->generic_buffer_virt[request_id];
+	tw_dev->posted_request_count--;
+	aen = le16_to_cpu(header->status_block.error);
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	command_packet = &full_command_packet->command.oldcommand;
+
+	/* First check for internal completion of set param for time sync */
+	if (TW_OP_OUT(command_packet->opcode__sgloffset) == TW_OP_SET_PARAM) {
+		/* Keep reading the queue in case there are more aen's */
+		if (twl_aen_read_queue(tw_dev, request_id))
+			goto out2;
+	        else {
+			retval = 0;
+			goto out;
+		}
+	}
+
+	switch (aen) {
+	case TW_AEN_QUEUE_EMPTY:
+		/* Quit reading the queue if this is the last one */
+		break;
+	case TW_AEN_SYNC_TIME_WITH_HOST:
+		twl_aen_sync_time(tw_dev, request_id);
+		retval = 0;
+		goto out;
+	default:
+		twl_aen_queue_event(tw_dev, header);
+
+		/* If there are more aen's, keep reading the queue */
+		if (twl_aen_read_queue(tw_dev, request_id))
+			goto out2;
+		else {
+			retval = 0;
+			goto out;
+		}
+	}
+	retval = 0;
+out2:
+	tw_dev->state[request_id] = TW_S_COMPLETED;
+	twl_free_request_id(tw_dev, request_id);
+	clear_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags);
+out:
+	return retval;
+} /* End twl_aen_complete() */
+
+/* This function will poll for a response */
+static int twl_poll_response(TW_Device_Extension *tw_dev, int request_id, int seconds)
+{
+	unsigned long before;
+	dma_addr_t mfa;
+	u32 regh, regl;
+	u32 response;
+	int retval = 1;
+	int found = 0;
+
+	before = jiffies;
+
+	while (!found) {
+		if (sizeof(dma_addr_t) > 4) {
+			regh = readl(TWL_HOBQPH_REG_ADDR(tw_dev));
+			regl = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
+			mfa = ((u64)regh << 32) | regl;
+		} else
+			mfa = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
+
+		response = (u32)mfa;
+
+		if (TW_RESID_OUT(response) == request_id)
+			found = 1;
+
+		if (time_after(jiffies, before + HZ * seconds))
+			goto out;
+
+		msleep(50);
+	}
+	retval = 0;
+out: 
+	return retval;
+} /* End twl_poll_response() */
+
+/* This function will drain the aen queue */
+static int twl_aen_drain_queue(TW_Device_Extension *tw_dev, int no_check_reset)
+{
+	int request_id = 0;
+	char cdb[TW_MAX_CDB_LEN];
+	TW_SG_Entry_ISO sglist[1];
+	int finished = 0, count = 0;
+	TW_Command_Full *full_command_packet;
+	TW_Command_Apache_Header *header;
+	unsigned short aen;
+	int first_reset = 0, queue = 0, retval = 1;
+
+	if (no_check_reset)
+		first_reset = 0;
+	else
+		first_reset = 1;
+
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	memset(full_command_packet, 0, sizeof(TW_Command_Full));
+
+	/* Initialize cdb */
+	memset(&cdb, 0, TW_MAX_CDB_LEN);
+	cdb[0] = REQUEST_SENSE; /* opcode */
+	cdb[4] = TW_ALLOCATION_LENGTH; /* allocation length */
+
+	/* Initialize sglist */
+	memset(&sglist, 0, sizeof(TW_SG_Entry_ISO));
+	sglist[0].length = TW_SECTOR_SIZE;
+	sglist[0].address = tw_dev->generic_buffer_phys[request_id];
+
+	/* Mark internal command */
+	tw_dev->srb[request_id] = NULL;
+
+	do {
+		/* Send command to the board */
+		if (twl_scsiop_execute_scsi(tw_dev, request_id, cdb, 1, sglist)) {
+			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x3, "Error posting request sense");
+			goto out;
+		}
+
+		/* Now poll for completion */
+		if (twl_poll_response(tw_dev, request_id, 30)) {
+			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x4, "No valid response while draining AEN queue");
+			tw_dev->posted_request_count--;
+			goto out;
+		}
+
+		tw_dev->posted_request_count--;
+		header = (TW_Command_Apache_Header *)tw_dev->generic_buffer_virt[request_id];
+		aen = le16_to_cpu(header->status_block.error);
+		queue = 0;
+		count++;
+
+		switch (aen) {
+		case TW_AEN_QUEUE_EMPTY:
+			if (first_reset != 1)
+				goto out;
+			else
+				finished = 1;
+			break;
+		case TW_AEN_SOFT_RESET:
+			if (first_reset == 0)
+				first_reset = 1;
+			else
+				queue = 1;
+			break;
+		case TW_AEN_SYNC_TIME_WITH_HOST:
+			break;
+		default:
+			queue = 1;
+		}
+
+		/* Now queue an event info */
+		if (queue)
+			twl_aen_queue_event(tw_dev, header);
+	} while ((finished == 0) && (count < TW_MAX_AEN_DRAIN));
+
+	if (count == TW_MAX_AEN_DRAIN)
+		goto out;
+
+	retval = 0;
+out:
+	tw_dev->state[request_id] = TW_S_INITIAL;
+	return retval;
+} /* End twl_aen_drain_queue() */
+
+/* This function will allocate memory and check if it is correctly aligned */
+static int twl_allocate_memory(TW_Device_Extension *tw_dev, int size, int which)
+{
+	int i;
+	dma_addr_t dma_handle;
+	unsigned long *cpu_addr;
+	int retval = 1;
+
+	cpu_addr = pci_alloc_consistent(tw_dev->tw_pci_dev, size*TW_Q_LENGTH, &dma_handle);
+	if (!cpu_addr) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x5, "Memory allocation failed");
+		goto out;
+	}
+
+	memset(cpu_addr, 0, size*TW_Q_LENGTH);
+
+	for (i = 0; i < TW_Q_LENGTH; i++) {
+		switch(which) {
+		case 0:
+			tw_dev->command_packet_phys[i] = dma_handle+(i*size);
+			tw_dev->command_packet_virt[i] = (TW_Command_Full *)((unsigned char *)cpu_addr + (i*size));
+			break;
+		case 1:
+			tw_dev->generic_buffer_phys[i] = dma_handle+(i*size);
+			tw_dev->generic_buffer_virt[i] = (unsigned long *)((unsigned char *)cpu_addr + (i*size));
+			break;
+		case 2:
+			tw_dev->sense_buffer_phys[i] = dma_handle+(i*size);
+			tw_dev->sense_buffer_virt[i] = (TW_Command_Apache_Header *)((unsigned char *)cpu_addr + (i*size));
+			break;
+		}
+	}
+	retval = 0;
+out:
+	return retval;
+} /* End twl_allocate_memory() */
+
+/* This function will load the request id and various sgls for ioctls */
+static void twl_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_command_packet, int request_id, dma_addr_t dma_handle, int length)
+{
+	TW_Command *oldcommand;
+	TW_Command_Apache *newcommand;
+	TW_SG_Entry_ISO *sgl;
+	unsigned int pae = 0;
+
+	if ((sizeof(long) < 8) && (sizeof(dma_addr_t) > 4))
+		pae = 1;
+
+	if (TW_OP_OUT(full_command_packet->command.newcommand.opcode__reserved) == TW_OP_EXECUTE_SCSI) {
+		newcommand = &full_command_packet->command.newcommand;
+		newcommand->request_id__lunl =
+			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id));
+		if (length) {
+			newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
+			newcommand->sg_list[0].length = TW_CPU_TO_SGL(length);
+		}
+		newcommand->sgl_entries__lunh =
+			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->sgl_entries__lunh), length ? 1 : 0));
+	} else {
+		oldcommand = &full_command_packet->command.oldcommand;
+		oldcommand->request_id = request_id;
+
+		if (TW_SGL_OUT(oldcommand->opcode__sgloffset)) {
+			/* Load the sg list */
+			sgl = (TW_SG_Entry_ISO *)((u32 *)oldcommand+oldcommand->size - (sizeof(TW_SG_Entry_ISO)/4) + pae + (sizeof(dma_addr_t) > 4 ? 1 : 0));
+			sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
+			sgl->length = TW_CPU_TO_SGL(length);
+			oldcommand->size += pae;
+			oldcommand->size += sizeof(dma_addr_t) > 4 ? 1 : 0;
+		}
+	}
+} /* End twl_load_sgl() */
+
+/* This function handles ioctl for the character device
+   This interface is used by smartmontools open source software */
+static int twl_chrdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	long timeout;
+	unsigned long *cpu_addr, data_buffer_length_adjusted = 0, flags = 0;
+	dma_addr_t dma_handle;
+	int request_id = 0;
+	TW_Ioctl_Driver_Command driver_command;
+	TW_Ioctl_Buf_Apache *tw_ioctl;
+	TW_Command_Full *full_command_packet;
+	TW_Device_Extension *tw_dev = twl_device_extension_list[iminor(inode)];
+	int retval = -EFAULT;
+	void __user *argp = (void __user *)arg;
+
+	/* Only let one of these through at a time */
+	if (mutex_lock_interruptible(&tw_dev->ioctl_lock)) {
+		retval = -EINTR;
+		goto out;
+	}
+
+	/* First copy down the driver command */
+	if (copy_from_user(&driver_command, argp, sizeof(TW_Ioctl_Driver_Command)))
+		goto out2;
+
+	/* Check data buffer size */
+	if (driver_command.buffer_length > TW_MAX_SECTORS * 2048) {
+		retval = -EINVAL;
+		goto out2;
+	}
+
+	/* Hardware can only do multiple of 512 byte transfers */
+	data_buffer_length_adjusted = (driver_command.buffer_length + 511) & ~511;
+
+	/* Now allocate ioctl buf memory */
+	cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, &dma_handle, GFP_KERNEL);
+	if (!cpu_addr) {
+		retval = -ENOMEM;
+		goto out2;
+	}
+
+	tw_ioctl = (TW_Ioctl_Buf_Apache *)cpu_addr;
+
+	/* Now copy down the entire ioctl */
+	if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache) - 1))
+		goto out3;
+
+	/* See which ioctl we are doing */
+	switch (cmd) {
+	case TW_IOCTL_FIRMWARE_PASS_THROUGH:
+		spin_lock_irqsave(tw_dev->host->host_lock, flags);
+		twl_get_request_id(tw_dev, &request_id);
+
+		/* Flag internal command */
+		tw_dev->srb[request_id] = NULL;
+
+		/* Flag chrdev ioctl */
+		tw_dev->chrdev_request_id = request_id;
+
+		full_command_packet = (TW_Command_Full *)&tw_ioctl->firmware_command;
+
+		/* Load request id and sglist for both command types */
+		twl_load_sgl(tw_dev, full_command_packet, request_id, dma_handle, data_buffer_length_adjusted);
+
+		memcpy(tw_dev->command_packet_virt[request_id], &(tw_ioctl->firmware_command), sizeof(TW_Command_Full));
+
+		/* Now post the command packet to the controller */
+		twl_post_command_packet(tw_dev, request_id);
+		spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+		timeout = TW_IOCTL_CHRDEV_TIMEOUT*HZ;
+
+		/* Now wait for command to complete */
+		timeout = wait_event_timeout(tw_dev->ioctl_wqueue, tw_dev->chrdev_request_id == TW_IOCTL_CHRDEV_FREE, timeout);
+
+		/* We timed out, and didn't get an interrupt */
+		if (tw_dev->chrdev_request_id != TW_IOCTL_CHRDEV_FREE) {
+			/* Now we need to reset the board */
+			printk(KERN_WARNING "3w-sas: scsi%d: WARNING: (0x%02X:0x%04X): Character ioctl (0x%x) timed out, resetting card.\n",
+			       tw_dev->host->host_no, TW_DRIVER, 0x6,
+			       cmd);
+			retval = -EIO;
+			twl_reset_device_extension(tw_dev, 1);
+			goto out3;
+		}
+
+		/* Now copy in the command packet response */
+		memcpy(&(tw_ioctl->firmware_command), tw_dev->command_packet_virt[request_id], sizeof(TW_Command_Full));
+		
+		/* Now complete the io */
+		spin_lock_irqsave(tw_dev->host->host_lock, flags);
+		tw_dev->posted_request_count--;
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		twl_free_request_id(tw_dev, request_id);
+		spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+		break;
+	default:
+		retval = -ENOTTY;
+		goto out3;
+	}
+
+	/* Now copy the entire response to userspace */
+	if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length - 1) == 0)
+		retval = 0;
+out3:
+	/* Now free ioctl buf memory */
+	dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, cpu_addr, dma_handle);
+out2:
+	mutex_unlock(&tw_dev->ioctl_lock);
+out:
+	return retval;
+} /* End twl_chrdev_ioctl() */
+
+/* This function handles open for the character device */
+static int twl_chrdev_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor_number;
+	int retval = -ENODEV;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		retval = -EACCES;
+		goto out;
+	}
+
+	cycle_kernel_lock();
+	minor_number = iminor(inode);
+	if (minor_number >= twl_device_extension_count)
+		goto out;
+	retval = 0;
+out:
+	return retval;
+} /* End twl_chrdev_open() */
+
+/* File operations struct for character device */
+static const struct file_operations twl_fops = {
+	.owner		= THIS_MODULE,
+	.ioctl		= twl_chrdev_ioctl,
+	.open		= twl_chrdev_open,
+	.release	= NULL
+};
+
+/* This function passes sense data from firmware to scsi layer */
+static int twl_fill_sense(TW_Device_Extension *tw_dev, int i, int request_id, int copy_sense, int print_host)
+{
+	TW_Command_Apache_Header *header;
+	TW_Command_Full *full_command_packet;
+	unsigned short error;
+	char *error_str;
+	int retval = 1;
+
+	header = tw_dev->sense_buffer_virt[i];
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+
+	/* Get embedded firmware error string */
+	error_str = &(header->err_specific_desc[strlen(header->err_specific_desc) + 1]);
+
+	/* Don't print error for Logical unit not supported during rollcall */
+	error = le16_to_cpu(header->status_block.error);
+	if ((error != TW_ERROR_LOGICAL_UNIT_NOT_SUPPORTED) && (error != TW_ERROR_UNIT_OFFLINE) && (error != TW_ERROR_INVALID_FIELD_IN_CDB)) {
+		if (print_host)
+			printk(KERN_WARNING "3w-sas: scsi%d: ERROR: (0x%02X:0x%04X): %s:%s.\n",
+			       tw_dev->host->host_no,
+			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
+			       header->status_block.error,
+			       error_str, 
+			       header->err_specific_desc);
+		else
+			printk(KERN_WARNING "3w-sas: ERROR: (0x%02X:0x%04X): %s:%s.\n",
+			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
+			       header->status_block.error,
+			       error_str,
+			       header->err_specific_desc);
+	}
+
+	if (copy_sense) {
+		memcpy(tw_dev->srb[request_id]->sense_buffer, header->sense_data, TW_SENSE_DATA_LENGTH);
+		tw_dev->srb[request_id]->result = (full_command_packet->command.newcommand.status << 1);
+		goto out;
+	}
+out:
+	return retval;
+} /* End twl_fill_sense() */
+
+/* This function will free up device extension resources */
+static void twl_free_device_extension(TW_Device_Extension *tw_dev)
+{
+	if (tw_dev->command_packet_virt[0])
+		pci_free_consistent(tw_dev->tw_pci_dev,
+				    sizeof(TW_Command_Full)*TW_Q_LENGTH,
+				    tw_dev->command_packet_virt[0],
+				    tw_dev->command_packet_phys[0]);
+
+	if (tw_dev->generic_buffer_virt[0])
+		pci_free_consistent(tw_dev->tw_pci_dev,
+				    TW_SECTOR_SIZE*TW_Q_LENGTH,
+				    tw_dev->generic_buffer_virt[0],
+				    tw_dev->generic_buffer_phys[0]);
+
+	if (tw_dev->sense_buffer_virt[0])
+		pci_free_consistent(tw_dev->tw_pci_dev,
+				    sizeof(TW_Command_Apache_Header)*
+				    TW_Q_LENGTH,
+				    tw_dev->sense_buffer_virt[0],
+				    tw_dev->sense_buffer_phys[0]);
+
+	kfree(tw_dev->event_queue[0]);
+} /* End twl_free_device_extension() */
+
+/* This function will get parameter table entries from the firmware */
+static void *twl_get_param(TW_Device_Extension *tw_dev, int request_id, int table_id, int parameter_id, int parameter_size_bytes)
+{
+	TW_Command_Full *full_command_packet;
+	TW_Command *command_packet;
+	TW_Param_Apache *param;
+	void *retval = NULL;
+
+	/* Setup the command packet */
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	memset(full_command_packet, 0, sizeof(TW_Command_Full));
+	command_packet = &full_command_packet->command.oldcommand;
+
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size              = TW_COMMAND_SIZE;
+	command_packet->request_id        = request_id;
+	command_packet->byte6_offset.block_count = cpu_to_le16(1);
+
+	/* Now setup the param */
+	param = (TW_Param_Apache *)tw_dev->generic_buffer_virt[request_id];
+	memset(param, 0, TW_SECTOR_SIZE);
+	param->table_id = cpu_to_le16(table_id | 0x8000);
+	param->parameter_id = cpu_to_le16(parameter_id);
+	param->parameter_size_bytes = cpu_to_le16(parameter_size_bytes);
+
+	command_packet->byte8_offset.param.sgl[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
+	command_packet->byte8_offset.param.sgl[0].length = TW_CPU_TO_SGL(TW_SECTOR_SIZE);
+
+	/* Post the command packet to the board */
+	twl_post_command_packet(tw_dev, request_id);
+
+	/* Poll for completion */
+	if (twl_poll_response(tw_dev, request_id, 30))
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x7, "No valid response during get param")
+	else
+		retval = (void *)&(param->data[0]);
+
+	tw_dev->posted_request_count--;
+	tw_dev->state[request_id] = TW_S_INITIAL;
+
+	return retval;
+} /* End twl_get_param() */
+
+/* This function will send an initconnection command to controller */
+static int twl_initconnection(TW_Device_Extension *tw_dev, int message_credits,
+ 			      u32 set_features, unsigned short current_fw_srl, 
+			      unsigned short current_fw_arch_id, 
+			      unsigned short current_fw_branch, 
+			      unsigned short current_fw_build, 
+			      unsigned short *fw_on_ctlr_srl, 
+			      unsigned short *fw_on_ctlr_arch_id, 
+			      unsigned short *fw_on_ctlr_branch, 
+			      unsigned short *fw_on_ctlr_build, 
+			      u32 *init_connect_result)
+{
+	TW_Command_Full *full_command_packet;
+	TW_Initconnect *tw_initconnect;
+	int request_id = 0, retval = 1;
+
+	/* Initialize InitConnection command packet */
+	full_command_packet = tw_dev->command_packet_virt[request_id];
+	memset(full_command_packet, 0, sizeof(TW_Command_Full));
+	full_command_packet->header.header_desc.size_header = 128;
+	
+	tw_initconnect = (TW_Initconnect *)&full_command_packet->command.oldcommand;
+	tw_initconnect->opcode__reserved = TW_OPRES_IN(0, TW_OP_INIT_CONNECTION);
+	tw_initconnect->request_id = request_id;
+	tw_initconnect->message_credits = cpu_to_le16(message_credits);
+	tw_initconnect->features = set_features;
+
+	/* Turn on 64-bit sgl support if we need to */
+	tw_initconnect->features |= sizeof(dma_addr_t) > 4 ? 1 : 0;
+
+	tw_initconnect->features = cpu_to_le32(tw_initconnect->features);
+
+	if (set_features & TW_EXTENDED_INIT_CONNECT) {
+		tw_initconnect->size = TW_INIT_COMMAND_PACKET_SIZE_EXTENDED;
+		tw_initconnect->fw_srl = cpu_to_le16(current_fw_srl);
+		tw_initconnect->fw_arch_id = cpu_to_le16(current_fw_arch_id);
+		tw_initconnect->fw_branch = cpu_to_le16(current_fw_branch);
+		tw_initconnect->fw_build = cpu_to_le16(current_fw_build);
+	} else 
+		tw_initconnect->size = TW_INIT_COMMAND_PACKET_SIZE;
+
+	/* Send command packet to the board */
+	twl_post_command_packet(tw_dev, request_id);
+
+	/* Poll for completion */
+	if (twl_poll_response(tw_dev, request_id, 30)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x8, "No valid response during init connection");
+	} else {
+		if (set_features & TW_EXTENDED_INIT_CONNECT) {
+			*fw_on_ctlr_srl = le16_to_cpu(tw_initconnect->fw_srl);
+			*fw_on_ctlr_arch_id = le16_to_cpu(tw_initconnect->fw_arch_id);
+			*fw_on_ctlr_branch = le16_to_cpu(tw_initconnect->fw_branch);
+			*fw_on_ctlr_build = le16_to_cpu(tw_initconnect->fw_build);
+			*init_connect_result = le32_to_cpu(tw_initconnect->result);
+		}
+		retval = 0;
+	}
+
+	tw_dev->posted_request_count--;
+	tw_dev->state[request_id] = TW_S_INITIAL;
+
+	return retval;
+} /* End twl_initconnection() */
+
+/* This function will initialize the fields of a device extension */
+static int twl_initialize_device_extension(TW_Device_Extension *tw_dev)
+{
+	int i, retval = 1;
+
+	/* Initialize command packet buffers */
+	if (twl_allocate_memory(tw_dev, sizeof(TW_Command_Full), 0)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x9, "Command packet memory allocation failed");
+		goto out;
+	}
+
+	/* Initialize generic buffer */
+	if (twl_allocate_memory(tw_dev, TW_SECTOR_SIZE, 1)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xa, "Generic memory allocation failed");
+		goto out;
+	}
+
+	/* Allocate sense buffers */
+	if (twl_allocate_memory(tw_dev, sizeof(TW_Command_Apache_Header), 2)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xb, "Sense buffer allocation failed");
+		goto out;
+	}
+
+	/* Allocate event info space */
+	tw_dev->event_queue[0] = kcalloc(TW_Q_LENGTH, sizeof(TW_Event), GFP_KERNEL);
+	if (!tw_dev->event_queue[0]) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xc, "Event info memory allocation failed");
+		goto out;
+	}
+
+	for (i = 0; i < TW_Q_LENGTH; i++) {
+		tw_dev->event_queue[i] = (TW_Event *)((unsigned char *)tw_dev->event_queue[0] + (i * sizeof(TW_Event)));
+		tw_dev->free_queue[i] = i;
+		tw_dev->state[i] = TW_S_INITIAL;
+	}
+
+	tw_dev->free_head = TW_Q_START;
+	tw_dev->free_tail = TW_Q_START;
+	tw_dev->error_sequence_id = 1;
+	tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+
+	mutex_init(&tw_dev->ioctl_lock);
+	init_waitqueue_head(&tw_dev->ioctl_wqueue);
+
+	retval = 0;
+out:
+	return retval;
+} /* End twl_initialize_device_extension() */
+
+/* This function will perform a pci-dma unmap */
+static void twl_unmap_scsi_data(TW_Device_Extension *tw_dev, int request_id)
+{
+	struct scsi_cmnd *cmd = tw_dev->srb[request_id];
+
+	if (cmd->SCp.phase == TW_PHASE_SGLIST)
+		scsi_dma_unmap(cmd);
+} /* End twl_unmap_scsi_data() */
+
+/* This function will handle attention interrupts */
+static int twl_handle_attention_interrupt(TW_Device_Extension *tw_dev)
+{
+	int retval = 1;
+	u32 request_id, doorbell;
+
+	/* Read doorbell status */
+	doorbell = readl(TWL_HOBDB_REG_ADDR(tw_dev));
+
+	/* Check for controller errors */
+	if (doorbell & TWL_DOORBELL_CONTROLLER_ERROR) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xd, "Microcontroller Error: clearing");
+		goto out;
+	}
+
+	/* Check if we need to perform an AEN drain */
+	if (doorbell & TWL_DOORBELL_ATTENTION_INTERRUPT) {
+		if (!(test_and_set_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags))) {
+			twl_get_request_id(tw_dev, &request_id);
+			if (twl_aen_read_queue(tw_dev, request_id)) {
+				tw_dev->state[request_id] = TW_S_COMPLETED;
+				twl_free_request_id(tw_dev, request_id);
+				clear_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags);
+			}
+		}
+	}
+
+	retval = 0;
+out:
+	/* Clear doorbell interrupt */
+	TWL_CLEAR_DB_INTERRUPT(tw_dev);
+
+	/* Make sure the clear was flushed by reading it back */
+	readl(TWL_HOBDBC_REG_ADDR(tw_dev));
+
+	return retval;
+} /* End twl_handle_attention_interrupt() */
+
+/* Interrupt service routine */
+static irqreturn_t twl_interrupt(int irq, void *dev_instance)
+{
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)dev_instance;
+	int i, handled = 0, error = 0;
+	dma_addr_t mfa = 0;
+	u32 reg, regl, regh, response, request_id = 0;
+	struct scsi_cmnd *cmd;
+	TW_Command_Full *full_command_packet;
+
+	spin_lock(tw_dev->host->host_lock);
+
+	/* Read host interrupt status */
+	reg = readl(TWL_HISTAT_REG_ADDR(tw_dev));
+
+	/* Check if this is our interrupt, otherwise bail */
+	if (!(reg & TWL_HISTATUS_VALID_INTERRUPT))
+		goto twl_interrupt_bail;
+
+	handled = 1;
+
+	/* If we are resetting, bail */
+	if (test_bit(TW_IN_RESET, &tw_dev->flags))
+		goto twl_interrupt_bail;
+
+	/* Attention interrupt */
+	if (reg & TWL_HISTATUS_ATTENTION_INTERRUPT) {
+		if (twl_handle_attention_interrupt(tw_dev)) {
+			TWL_MASK_INTERRUPTS(tw_dev);
+			goto twl_interrupt_bail;
+		}
+	}
+
+	/* Response interrupt */
+	while (reg & TWL_HISTATUS_RESPONSE_INTERRUPT) {
+		if (sizeof(dma_addr_t) > 4) {
+			regh = readl(TWL_HOBQPH_REG_ADDR(tw_dev));
+			regl = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
+			mfa = ((u64)regh << 32) | regl;
+		} else
+			mfa = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
+
+		error = 0;
+		response = (u32)mfa;
+
+		/* Check for command packet error */
+		if (!TW_NOTMFA_OUT(response)) {
+			for (i=0;i<TW_Q_LENGTH;i++) {
+				if (tw_dev->sense_buffer_phys[i] == mfa) {
+					request_id = le16_to_cpu(tw_dev->sense_buffer_virt[i]->header_desc.request_id);
+					if (tw_dev->srb[request_id] != NULL)
+						error = twl_fill_sense(tw_dev, i, request_id, 1, 1);
+					else {
+						/* Skip ioctl error prints */
+						if (request_id != tw_dev->chrdev_request_id)
+							error = twl_fill_sense(tw_dev, i, request_id, 0, 1);
+						else
+							memcpy(tw_dev->command_packet_virt[request_id], tw_dev->sense_buffer_virt[i], sizeof(TW_Command_Apache_Header));
+					}
+
+					/* Now re-post the sense buffer */
+					writel((u32)((u64)tw_dev->sense_buffer_phys[i] >> 32), TWL_HOBQPH_REG_ADDR(tw_dev));
+					writel((u32)tw_dev->sense_buffer_phys[i], TWL_HOBQPL_REG_ADDR(tw_dev));
+					break;
+				}
+			}
+		} else
+			request_id = TW_RESID_OUT(response);
+
+		full_command_packet = tw_dev->command_packet_virt[request_id];
+
+		/* Check for correct state */
+		if (tw_dev->state[request_id] != TW_S_POSTED) {
+			if (tw_dev->srb[request_id] != NULL) {
+				TW_PRINTK(tw_dev->host, TW_DRIVER, 0xe, "Received a request id that wasn't posted");
+				TWL_MASK_INTERRUPTS(tw_dev);
+				goto twl_interrupt_bail;
+			}
+		}
+
+		/* Check for internal command completion */
+		if (tw_dev->srb[request_id] == NULL) {
+			if (request_id != tw_dev->chrdev_request_id) {
+				if (twl_aen_complete(tw_dev, request_id))
+					TW_PRINTK(tw_dev->host, TW_DRIVER, 0xf, "Error completing AEN during attention interrupt");
+			} else {
+				tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+				wake_up(&tw_dev->ioctl_wqueue);
+			}
+		} else {
+			cmd = tw_dev->srb[request_id];
+
+			if (!error)
+				cmd->result = (DID_OK << 16);
+			
+			/* Report residual bytes for single sgl */
+			if ((scsi_sg_count(cmd) <= 1) && (full_command_packet->command.newcommand.status == 0)) {
+				if (full_command_packet->command.newcommand.sg_list[0].length < scsi_bufflen(tw_dev->srb[request_id]))
+					scsi_set_resid(cmd, scsi_bufflen(cmd) - full_command_packet->command.newcommand.sg_list[0].length);
+			}
+
+			/* Now complete the io */
+			tw_dev->state[request_id] = TW_S_COMPLETED;
+			twl_free_request_id(tw_dev, request_id);
+			tw_dev->posted_request_count--;
+			tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
+			twl_unmap_scsi_data(tw_dev, request_id);
+		}
+
+		/* Check for another response interrupt */
+		reg = readl(TWL_HISTAT_REG_ADDR(tw_dev));
+	}
+
+twl_interrupt_bail:
+	spin_unlock(tw_dev->host->host_lock);
+	return IRQ_RETVAL(handled);
+} /* End twl_interrupt() */
+
+/* This function will poll for a register change */
+static int twl_poll_register(TW_Device_Extension *tw_dev, void *reg, u32 value, u32 result, int seconds)
+{
+	unsigned long before;
+	int retval = 1;
+	u32 reg_value;
+
+	reg_value = readl(reg);
+	before = jiffies;
+
+        while ((reg_value & value) != result) {
+		reg_value = readl(reg);
+		if (time_after(jiffies, before + HZ * seconds))
+			goto out;
+		msleep(50);
+	}
+	retval = 0;
+out:
+	return retval;
+} /* End twl_poll_register() */
+
+/* This function will reset a controller */
+static int twl_reset_sequence(TW_Device_Extension *tw_dev, int soft_reset)
+{
+	int retval = 1;
+	int i = 0;
+	u32 status = 0;
+	unsigned short fw_on_ctlr_srl = 0, fw_on_ctlr_arch_id = 0;
+	unsigned short fw_on_ctlr_branch = 0, fw_on_ctlr_build = 0;
+	u32 init_connect_result = 0;
+	int tries = 0;
+	int do_soft_reset = soft_reset;
+
+	while (tries < TW_MAX_RESET_TRIES) {
+		/* Do a soft reset if one is needed */
+		if (do_soft_reset) {
+			TWL_SOFT_RESET(tw_dev);
+
+			/* Make sure controller is in a good state */
+			if (twl_poll_register(tw_dev, TWL_SCRPD3_REG_ADDR(tw_dev), TWL_CONTROLLER_READY, 0x0, 30)) {
+				TW_PRINTK(tw_dev->host, TW_DRIVER, 0x10, "Controller never went non-ready during reset sequence");
+				tries++;
+				continue;
+			}
+			if (twl_poll_register(tw_dev, TWL_SCRPD3_REG_ADDR(tw_dev), TWL_CONTROLLER_READY, TWL_CONTROLLER_READY, 60)) {
+				TW_PRINTK(tw_dev->host, TW_DRIVER, 0x11, "Controller not ready during reset sequence");
+				tries++;
+				continue;
+			}
+		}
+
+		/* Initconnect */
+		if (twl_initconnection(tw_dev, TW_INIT_MESSAGE_CREDITS,
+				       TW_EXTENDED_INIT_CONNECT, TW_CURRENT_DRIVER_SRL,
+				       TW_9750_ARCH_ID, TW_CURRENT_DRIVER_BRANCH,
+				       TW_CURRENT_DRIVER_BUILD, &fw_on_ctlr_srl,
+				       &fw_on_ctlr_arch_id, &fw_on_ctlr_branch,
+				       &fw_on_ctlr_build, &init_connect_result)) {
+			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x12, "Initconnection failed while checking SRL");
+			do_soft_reset = 1;
+			tries++;
+			continue;
+		}
+
+		/* Load sense buffers */
+		while (i < TW_Q_LENGTH) {
+			writel((u32)((u64)tw_dev->sense_buffer_phys[i] >> 32), TWL_HOBQPH_REG_ADDR(tw_dev));
+			writel((u32)tw_dev->sense_buffer_phys[i], TWL_HOBQPL_REG_ADDR(tw_dev));
+
+			/* Check status for over-run after each write */
+			status = readl(TWL_STATUS_REG_ADDR(tw_dev));
+			if (!(status & TWL_STATUS_OVERRUN_SUBMIT))
+			    i++;
+		}
+
+		/* Now check status */
+		status = readl(TWL_STATUS_REG_ADDR(tw_dev));
+		if (status) {
+			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x13, "Bad controller status after loading sense buffers");
+			do_soft_reset = 1;
+			tries++;
+			continue;
+		}
+
+		/* Drain the AEN queue */
+		if (twl_aen_drain_queue(tw_dev, soft_reset)) {
+			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x14, "AEN drain failed during reset sequence");
+			do_soft_reset = 1;
+			tries++;
+			continue;
+		}
+
+		/* Load rest of compatibility struct */
+		strncpy(tw_dev->tw_compat_info.driver_version, TW_DRIVER_VERSION, strlen(TW_DRIVER_VERSION));
+		tw_dev->tw_compat_info.driver_srl_high = TW_CURRENT_DRIVER_SRL;
+		tw_dev->tw_compat_info.driver_branch_high = TW_CURRENT_DRIVER_BRANCH;
+		tw_dev->tw_compat_info.driver_build_high = TW_CURRENT_DRIVER_BUILD;
+		tw_dev->tw_compat_info.driver_srl_low = TW_BASE_FW_SRL;
+		tw_dev->tw_compat_info.driver_branch_low = TW_BASE_FW_BRANCH;
+		tw_dev->tw_compat_info.driver_build_low = TW_BASE_FW_BUILD;
+		tw_dev->tw_compat_info.fw_on_ctlr_srl = fw_on_ctlr_srl;
+		tw_dev->tw_compat_info.fw_on_ctlr_branch = fw_on_ctlr_branch;
+		tw_dev->tw_compat_info.fw_on_ctlr_build = fw_on_ctlr_build;
+
+		/* If we got here, controller is in a good state */
+		retval = 0;
+		goto out;
+	}
+out:
+	return retval;
+} /* End twl_reset_sequence() */
+
+/* This function will reset a device extension */
+static int twl_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset)
+{
+	int i = 0, retval = 1;
+	unsigned long flags = 0;
+
+	/* Block SCSI requests while we are resetting */
+	if (ioctl_reset)
+		scsi_block_requests(tw_dev->host);
+
+	set_bit(TW_IN_RESET, &tw_dev->flags);
+	TWL_MASK_INTERRUPTS(tw_dev);
+	TWL_CLEAR_DB_INTERRUPT(tw_dev);
+
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+
+	/* Abort all requests that are in progress */
+	for (i = 0; i < TW_Q_LENGTH; i++) {
+		if ((tw_dev->state[i] != TW_S_FINISHED) &&
+		    (tw_dev->state[i] != TW_S_INITIAL) &&
+		    (tw_dev->state[i] != TW_S_COMPLETED)) {
+			if (tw_dev->srb[i]) {
+				tw_dev->srb[i]->result = (DID_RESET << 16);
+				tw_dev->srb[i]->scsi_done(tw_dev->srb[i]);
+				twl_unmap_scsi_data(tw_dev, i);
+			}
+		}
+	}
+
+	/* Reset queues and counts */
+	for (i = 0; i < TW_Q_LENGTH; i++) {
+		tw_dev->free_queue[i] = i;
+		tw_dev->state[i] = TW_S_INITIAL;
+	}
+	tw_dev->free_head = TW_Q_START;
+	tw_dev->free_tail = TW_Q_START;
+	tw_dev->posted_request_count = 0;
+
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+	if (twl_reset_sequence(tw_dev, 1))
+		goto out;
+
+	TWL_UNMASK_INTERRUPTS(tw_dev);
+
+	clear_bit(TW_IN_RESET, &tw_dev->flags);
+	tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+
+	retval = 0;
+out:
+	if (ioctl_reset)
+		scsi_unblock_requests(tw_dev->host);
+	return retval;
+} /* End twl_reset_device_extension() */
+
+/* This funciton returns unit geometry in cylinders/heads/sectors */
+static int twl_scsi_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int geom[])
+{
+	int heads, sectors;
+	TW_Device_Extension *tw_dev;
+
+	tw_dev = (TW_Device_Extension *)sdev->host->hostdata;
+
+	if (capacity >= 0x200000) {
+		heads = 255;
+		sectors = 63;
+	} else {
+		heads = 64;
+		sectors = 32;
+	}
+
+	geom[0] = heads;
+	geom[1] = sectors;
+	geom[2] = sector_div(capacity, heads * sectors); /* cylinders */
+
+	return 0;
+} /* End twl_scsi_biosparam() */
+
+/* This is the new scsi eh reset function */
+static int twl_scsi_eh_reset(struct scsi_cmnd *SCpnt)
+{
+	TW_Device_Extension *tw_dev = NULL;
+	int retval = FAILED;
+
+	tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
+
+	tw_dev->num_resets++;
+
+	sdev_printk(KERN_WARNING, SCpnt->device,
+		"WARNING: (0x%02X:0x%04X): Command (0x%x) timed out, resetting card.\n",
+		TW_DRIVER, 0x2c, SCpnt->cmnd[0]);
+
+	/* Make sure we are not issuing an ioctl or resetting from ioctl */
+	mutex_lock(&tw_dev->ioctl_lock);
+
+	/* Now reset the card and some of the device extension data */
+	if (twl_reset_device_extension(tw_dev, 0)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x15, "Controller reset failed during scsi host reset");
+		goto out;
+	}
+
+	retval = SUCCESS;
+out:
+	mutex_unlock(&tw_dev->ioctl_lock);
+	return retval;
+} /* End twl_scsi_eh_reset() */
+
+/* This is the main scsi queue function to handle scsi opcodes */
+static int twl_scsi_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
+{
+	int request_id, retval;
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
+
+	/* If we are resetting due to timed out ioctl, report as busy */
+	if (test_bit(TW_IN_RESET, &tw_dev->flags)) {
+		retval = SCSI_MLQUEUE_HOST_BUSY;
+		goto out;
+	}
+
+	/* Save done function into scsi_cmnd struct */
+	SCpnt->scsi_done = done;
+		
+	/* Get a free request id */
+	twl_get_request_id(tw_dev, &request_id);
+
+	/* Save the scsi command for use by the ISR */
+	tw_dev->srb[request_id] = SCpnt;
+
+	/* Initialize phase to zero */
+	SCpnt->SCp.phase = TW_PHASE_INITIAL;
+
+	retval = twl_scsiop_execute_scsi(tw_dev, request_id, NULL, 0, NULL);
+	if (retval) {
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		twl_free_request_id(tw_dev, request_id);
+		SCpnt->result = (DID_ERROR << 16);
+		done(SCpnt);
+		retval = 0;
+	}
+out:
+	return retval;
+} /* End twl_scsi_queue() */
+
+/* This function tells the controller to shut down */
+static void __twl_shutdown(TW_Device_Extension *tw_dev)
+{
+	/* Disable interrupts */
+	TWL_MASK_INTERRUPTS(tw_dev);
+
+	/* Free up the IRQ */
+	free_irq(tw_dev->tw_pci_dev->irq, tw_dev);
+
+	printk(KERN_WARNING "3w-sas: Shutting down host %d.\n", tw_dev->host->host_no);
+
+	/* Tell the card we are shutting down */
+	if (twl_initconnection(tw_dev, 1, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x16, "Connection shutdown failed");
+	} else {
+		printk(KERN_WARNING "3w-sas: Shutdown complete.\n");
+	}
+
+	/* Clear doorbell interrupt just before exit */
+	TWL_CLEAR_DB_INTERRUPT(tw_dev);
+} /* End __twl_shutdown() */
+
+/* Wrapper for __twl_shutdown */
+static void twl_shutdown(struct pci_dev *pdev)
+{
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	TW_Device_Extension *tw_dev;
+
+	if (!host)
+		return;
+
+	tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	if (tw_dev->online) 
+		__twl_shutdown(tw_dev);
+} /* End twl_shutdown() */
+
+/* This function configures unit settings when a unit is coming on-line */
+static int twl_slave_configure(struct scsi_device *sdev)
+{
+	/* Force 60 second timeout */
+	blk_queue_rq_timeout(sdev->request_queue, 60 * HZ);
+
+	return 0;
+} /* End twl_slave_configure() */
+
+/* scsi_host_template initializer */
+static struct scsi_host_template driver_template = {
+	.module			= THIS_MODULE,
+	.name			= "3w-sas",
+	.queuecommand		= twl_scsi_queue,
+	.eh_host_reset_handler	= twl_scsi_eh_reset,
+	.bios_param		= twl_scsi_biosparam,
+	.change_queue_depth	= twl_change_queue_depth,
+	.can_queue		= TW_Q_LENGTH-2,
+	.slave_configure	= twl_slave_configure,
+	.this_id		= -1,
+	.sg_tablesize		= TW_LIBERATOR_MAX_SGL_LENGTH,
+	.max_sectors		= TW_MAX_SECTORS,
+	.cmd_per_lun		= TW_MAX_CMDS_PER_LUN,
+	.use_clustering		= ENABLE_CLUSTERING,
+	.shost_attrs		= twl_host_attrs,
+	.emulated		= 1
+};
+
+/* This function will probe and initialize a card */
+static int __devinit twl_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
+{
+	struct Scsi_Host *host = NULL;
+	TW_Device_Extension *tw_dev;
+	int retval = -ENODEV;
+	int *ptr_phycount, phycount=0;
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		TW_PRINTK(host, TW_DRIVER, 0x17, "Failed to enable pci device");
+		goto out_disable_device;
+	}
+
+	pci_set_master(pdev);
+	pci_try_set_mwi(pdev);
+
+	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
+	    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
+		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
+		    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
+			TW_PRINTK(host, TW_DRIVER, 0x18, "Failed to set dma mask");
+			retval = -ENODEV;
+			goto out_disable_device;
+		}
+
+	host = scsi_host_alloc(&driver_template, sizeof(TW_Device_Extension));
+	if (!host) {
+		TW_PRINTK(host, TW_DRIVER, 0x19, "Failed to allocate memory for device extension");
+		retval = -ENOMEM;
+		goto out_disable_device;
+	}
+	tw_dev = shost_priv(host);
+
+	/* Save values to device extension */
+	tw_dev->host = host;
+	tw_dev->tw_pci_dev = pdev;
+
+	if (twl_initialize_device_extension(tw_dev)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1a, "Failed to initialize device extension");
+		goto out_free_device_extension;
+	}
+
+	/* Request IO regions */
+	retval = pci_request_regions(pdev, "3w-sas");
+	if (retval) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1b, "Failed to get mem region");
+		goto out_free_device_extension;
+	}
+
+	/* Save base address, use region 1 */
+	tw_dev->base_addr = pci_iomap(pdev, 1, 0);
+	if (!tw_dev->base_addr) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1c, "Failed to ioremap");
+		goto out_release_mem_region;
+	}
+
+	/* Disable interrupts on the card */
+	TWL_MASK_INTERRUPTS(tw_dev);
+
+	/* Initialize the card */
+	if (twl_reset_sequence(tw_dev, 0)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1d, "Controller reset failed during probe");
+		goto out_iounmap;
+	}
+
+	/* Set host specific parameters */
+	host->max_id = TW_MAX_UNITS;
+	host->max_cmd_len = TW_MAX_CDB_LEN;
+	host->max_lun = TW_MAX_LUNS;
+	host->max_channel = 0;
+
+	/* Register the card with the kernel SCSI layer */
+	retval = scsi_add_host(host, &pdev->dev);
+	if (retval) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1e, "scsi add host failed");
+		goto out_iounmap;
+	}
+
+	pci_set_drvdata(pdev, host);
+
+	printk(KERN_WARNING "3w-sas: scsi%d: Found an LSI 3ware %s Controller at 0x%llx, IRQ: %d.\n",
+	       host->host_no,
+	       (char *)twl_get_param(tw_dev, 1, TW_VERSION_TABLE,
+				     TW_PARAM_MODEL, TW_PARAM_MODEL_LENGTH),
+	       (u64)pci_resource_start(pdev, 1), pdev->irq);
+
+	ptr_phycount = twl_get_param(tw_dev, 2, TW_PARAM_PHY_SUMMARY_TABLE,
+				     TW_PARAM_PHYCOUNT, TW_PARAM_PHYCOUNT_LENGTH);
+	if (ptr_phycount)
+		phycount = le32_to_cpu(*(int *)ptr_phycount);
+
+	printk(KERN_WARNING "3w-sas: scsi%d: Firmware %s, BIOS %s, Phys: %d.\n",
+	       host->host_no,
+	       (char *)twl_get_param(tw_dev, 1, TW_VERSION_TABLE,
+				     TW_PARAM_FWVER, TW_PARAM_FWVER_LENGTH),
+	       (char *)twl_get_param(tw_dev, 2, TW_VERSION_TABLE,
+				     TW_PARAM_BIOSVER, TW_PARAM_BIOSVER_LENGTH),
+	       phycount);
+
+	/* Try to enable MSI */
+	if (use_msi && !pci_enable_msi(pdev))
+		set_bit(TW_USING_MSI, &tw_dev->flags);
+
+	/* Now setup the interrupt handler */
+	retval = request_irq(pdev->irq, twl_interrupt, IRQF_SHARED, "3w-sas", tw_dev);
+	if (retval) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1f, "Error requesting IRQ");
+		goto out_remove_host;
+	}
+
+	twl_device_extension_list[twl_device_extension_count] = tw_dev;
+	twl_device_extension_count++;
+
+	/* Re-enable interrupts on the card */
+	TWL_UNMASK_INTERRUPTS(tw_dev);
+	
+	/* Finally, scan the host */
+	scsi_scan_host(host);
+
+	/* Add sysfs binary files */
+	if (sysfs_create_bin_file(&host->shost_dev.kobj, &twl_sysfs_aen_read_attr))
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x20, "Failed to create sysfs binary file: 3ware_aen_read");
+	if (sysfs_create_bin_file(&host->shost_dev.kobj, &twl_sysfs_compat_info_attr))
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x21, "Failed to create sysfs binary file: 3ware_compat_info");
+
+	if (twl_major == -1) {
+		if ((twl_major = register_chrdev (0, "twl", &twl_fops)) < 0)
+			TW_PRINTK(host, TW_DRIVER, 0x22, "Failed to register character device");
+	}
+	tw_dev->online = 1;
+	return 0;
+
+out_remove_host:
+	if (test_bit(TW_USING_MSI, &tw_dev->flags))
+		pci_disable_msi(pdev);
+	scsi_remove_host(host);
+out_iounmap:
+	iounmap(tw_dev->base_addr);
+out_release_mem_region:
+	pci_release_regions(pdev);
+out_free_device_extension:
+	twl_free_device_extension(tw_dev);
+	scsi_host_put(host);
+out_disable_device:
+	pci_disable_device(pdev);
+
+	return retval;
+} /* End twl_probe() */
+
+/* This function is called to remove a device */
+static void twl_remove(struct pci_dev *pdev)
+{
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	TW_Device_Extension *tw_dev;
+
+	if (!host)
+		return;
+
+	tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	if (!tw_dev->online)
+		return;
+
+	/* Remove sysfs binary files */
+	sysfs_remove_bin_file(&host->shost_dev.kobj, &twl_sysfs_aen_read_attr);
+	sysfs_remove_bin_file(&host->shost_dev.kobj, &twl_sysfs_compat_info_attr);
+
+	scsi_remove_host(tw_dev->host);
+
+	/* Unregister character device */
+	if (twl_major >= 0) {
+		unregister_chrdev(twl_major, "twl");
+		twl_major = -1;
+	}
+
+	/* Shutdown the card */
+	__twl_shutdown(tw_dev);
+
+	/* Disable MSI if enabled */
+	if (test_bit(TW_USING_MSI, &tw_dev->flags))
+		pci_disable_msi(pdev);
+
+	/* Free IO remapping */
+	iounmap(tw_dev->base_addr);
+
+	/* Free up the mem region */
+	pci_release_regions(pdev);
+
+	/* Free up device extension resources */
+	twl_free_device_extension(tw_dev);
+
+	scsi_host_put(tw_dev->host);
+	pci_disable_device(pdev);
+	twl_device_extension_count--;
+} /* End twl_remove() */
+
+#ifdef CONFIG_PM
+/* This function is called on PCI suspend */
+static int twl_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	printk(KERN_WARNING "3w-sas: Suspending host %d.\n", tw_dev->host->host_no);
+	/* Disable interrupts */
+	TWL_MASK_INTERRUPTS(tw_dev);
+
+	free_irq(tw_dev->tw_pci_dev->irq, tw_dev);
+
+	/* Tell the card we are shutting down */
+	if (twl_initconnection(tw_dev, 1, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL)) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x23, "Connection shutdown failed during suspend");
+	} else {
+		printk(KERN_WARNING "3w-sas: Suspend complete.\n");
+	}
+
+	/* Clear doorbell interrupt */
+	TWL_CLEAR_DB_INTERRUPT(tw_dev);
+
+	pci_save_state(pdev);
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+	return 0;
+} /* End twl_suspend() */
+
+/* This function is called on PCI resume */
+static int twl_resume(struct pci_dev *pdev)
+{
+	int retval = 0;
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	printk(KERN_WARNING "3w-sas: Resuming host %d.\n", tw_dev->host->host_no);
+	pci_set_power_state(pdev, PCI_D0);
+	pci_enable_wake(pdev, PCI_D0, 0);
+	pci_restore_state(pdev);
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x24, "Enable device failed during resume");
+		return retval;
+	}
+
+	pci_set_master(pdev);
+	pci_try_set_mwi(pdev);
+
+	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
+	    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
+		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
+		    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
+			TW_PRINTK(host, TW_DRIVER, 0x25, "Failed to set dma mask during resume");
+			retval = -ENODEV;
+			goto out_disable_device;
+		}
+
+	/* Initialize the card */
+	if (twl_reset_sequence(tw_dev, 0)) {
+		retval = -ENODEV;
+		goto out_disable_device;
+	}
+
+	/* Now setup the interrupt handler */
+	retval = request_irq(pdev->irq, twl_interrupt, IRQF_SHARED, "3w-sas", tw_dev);
+	if (retval) {
+		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x26, "Error requesting IRQ during resume");
+		retval = -ENODEV;
+		goto out_disable_device;
+	}
+
+	/* Now enable MSI if enabled */
+	if (test_bit(TW_USING_MSI, &tw_dev->flags))
+		pci_enable_msi(pdev);
+
+	/* Re-enable interrupts on the card */
+	TWL_UNMASK_INTERRUPTS(tw_dev);
+
+	printk(KERN_WARNING "3w-sas: Resume complete.\n");
+	return 0;
+
+out_disable_device:
+	scsi_remove_host(host);
+	pci_disable_device(pdev);
+
+	return retval;
+} /* End twl_resume() */
+#endif
+
+/* PCI Devices supported by this driver */
+static struct pci_device_id twl_pci_tbl[] __devinitdata = {
+	{ PCI_VDEVICE(3WARE, PCI_DEVICE_ID_3WARE_9750) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, twl_pci_tbl);
+
+/* pci_driver initializer */
+static struct pci_driver twl_driver = {
+	.name		= "3w-sas",
+	.id_table	= twl_pci_tbl,
+	.probe		= twl_probe,
+	.remove		= twl_remove,
+#ifdef CONFIG_PM
+	.suspend	= twl_suspend,
+	.resume		= twl_resume,
+#endif
+	.shutdown	= twl_shutdown
+};
+
+/* This function is called on driver initialization */
+static int __init twl_init(void)
+{
+	printk(KERN_INFO "LSI 3ware SAS/SATA-RAID Controller device driver for Linux v%s.\n", TW_DRIVER_VERSION);
+
+	return pci_register_driver(&twl_driver);
+} /* End twl_init() */
+
+/* This function is called on driver exit */
+static void __exit twl_exit(void)
+{
+	pci_unregister_driver(&twl_driver);
+} /* End twl_exit() */
+
+module_init(twl_init);
+module_exit(twl_exit);
+