[RFC PATCH 4/6] isci: hardware / topology event handling

[Dan Williams <dan.j.williams@intel.com>]

1/ Core notifications (phy, port, and device events)
2/ Timer interface.
2/ OS abstraction core callbacks (deprecated / to be removed)

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/scsi/isci/deprecated.c |  491 ++++++++++++++++++++++++++++++++
 drivers/scsi/isci/events.c     |  619 ++++++++++++++++++++++++++++++++++++++++
 drivers/scsi/isci/timers.c     |  319 +++++++++++++++++++++
 drivers/scsi/isci/timers.h     |  126 ++++++++
 4 files changed, 1555 insertions(+), 0 deletions(-)
 create mode 100644 drivers/scsi/isci/deprecated.c
 create mode 100644 drivers/scsi/isci/events.c
 create mode 100644 drivers/scsi/isci/timers.c
 create mode 100644 drivers/scsi/isci/timers.h

diff --git a/drivers/scsi/isci/deprecated.c b/drivers/scsi/isci/deprecated.c
new file mode 100644
index 0000000..847e687
--- /dev/null
+++ b/drivers/scsi/isci/deprecated.c
@@ -0,0 +1,491 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ */
+
+
+/**
+ * This file contains isci module object implementation.
+ *
+ *
+ */
+
+#include "isci.h"
+#include "request.h"
+#include "sata.h"
+#include "task.h"
+
+
+/**
+ * scic_cb_stall_execution() - This method is called when the core requires the
+ *    OS driver to stall execution.  This method is utilized during
+ *    initialization or non-performance paths only.
+ * @microseconds: This parameter specifies the number of microseconds for which
+ *    to stall.  The operating system driver is allowed to round this value up
+ *    where necessary.
+ *
+ * none.
+ */
+void scic_cb_stall_execution(
+	u32 microseconds)
+{
+	udelay(microseconds);
+}
+
+
+/**
+ * scic_cb_io_request_get_physical_address() - This callback method asks the
+ *    user to provide the physical address for the supplied virtual address
+ *    when building an io request object.
+ * @controller: This parameter is the core controller object handle.
+ * @io_request: This parameter is the io request object handle for which the
+ *    physical address is being requested.
+ *
+ *
+ */
+void scic_cb_io_request_get_physical_address(
+	struct scic_sds_controller *controller,
+	struct scic_sds_request *io_request,
+	void *virtual_address,
+	dma_addr_t *physical_address)
+{
+	struct isci_request *request =
+		(struct isci_request *)sci_object_get_association(io_request);
+
+	char *requested_address = (char *)virtual_address;
+	char *base_address = (char *)request;
+
+	BUG_ON(requested_address < base_address);
+	BUG_ON((requested_address - base_address) >=
+			request->request_alloc_size);
+
+	*physical_address = request->request_daddr +
+		(requested_address - base_address);
+}
+
+/**
+ * scic_cb_io_request_get_transfer_length() - This callback method asks the
+ *    user to provide the number of bytes to be transfered as part of this
+ *    request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the number of payload data bytes to be transfered for
+ * this IO request.
+ */
+u32 scic_cb_io_request_get_transfer_length(
+	void *scic_user_io_request)
+{
+	return isci_request_io_request_get_transfer_length(
+		       scic_user_io_request
+		       );
+}
+
+
+/**
+ * scic_cb_io_request_get_data_direction() - This callback method asks the user
+ *    to provide the data direction for this request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the value of SCI_IO_REQUEST_DATA_OUT or
+ * SCI_IO_REQUEST_DATA_IN, or SCI_IO_REQUEST_NO_DATA.
+ */
+SCI_IO_REQUEST_DATA_DIRECTION scic_cb_io_request_get_data_direction(
+	void *scic_user_io_request)
+{
+	return isci_request_io_request_get_data_direction(
+		       scic_user_io_request
+		       );
+}
+
+
+/**
+ * scic_cb_io_request_get_next_sge() - This callback method asks the user to
+ *    provide the address to where the next Scatter-Gather Element is located.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ * @current_sge_address: This parameter specifies the address for the current
+ *    SGE (i.e. the one that has just processed).
+ *
+ * An address specifying the location for the next scatter gather element to be
+ * processed.
+ */
+void scic_cb_io_request_get_next_sge(
+	void *scic_user_io_request,
+	void *current_sge_address,
+	void **next_sge)
+{
+	*next_sge = isci_request_io_request_get_next_sge(
+		scic_user_io_request,
+		current_sge_address
+		);
+}
+
+/**
+ * scic_cb_sge_get_address_field() - This callback method asks the user to
+ *    provide the contents of the "address" field in the Scatter-Gather Element.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ * @sge_address: This parameter specifies the address for the SGE from which to
+ *    retrieve the address field.
+ *
+ * A physical address specifying the contents of the SGE's address field.
+ */
+dma_addr_t scic_cb_sge_get_address_field(
+	void *scic_user_io_request,
+	void *sge_address)
+{
+	return isci_request_sge_get_address_field(
+		       scic_user_io_request,
+		       sge_address
+		       );
+}
+
+/**
+ * scic_cb_sge_get_length_field() - This callback method asks the user to
+ *    provide the contents of the "length" field in the Scatter-Gather Element.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ * @sge_address: This parameter specifies the address for the SGE from which to
+ *    retrieve the address field.
+ *
+ * This method returns the length field specified inside the SGE referenced by
+ * the sge_address parameter.
+ */
+u32 scic_cb_sge_get_length_field(
+	void *scic_user_io_request,
+	void *sge_address)
+{
+	return isci_request_sge_get_length_field(
+		       scic_user_io_request,
+		       sge_address
+		       );
+}
+
+/**
+ * scic_cb_ssp_io_request_get_cdb_address() - This callback method asks the
+ *    user to provide the address for the command descriptor block (CDB)
+ *    associated with this IO request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the virtual address of the CDB.
+ */
+void *scic_cb_ssp_io_request_get_cdb_address(
+	void *scic_user_io_request)
+{
+	return isci_request_ssp_io_request_get_cdb_address(
+		       scic_user_io_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_io_request_get_cdb_length() - This callback method asks the user
+ *    to provide the length of the command descriptor block (CDB) associated
+ *    with this IO request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the length of the CDB.
+ */
+u32 scic_cb_ssp_io_request_get_cdb_length(
+	void *scic_user_io_request)
+{
+	return isci_request_ssp_io_request_get_cdb_length(
+		       scic_user_io_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_io_request_get_lun() - This callback method asks the user to
+ *    provide the Logical Unit (LUN) associated with this IO request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the LUN associated with this request. This should be u64?
+ */
+u32 scic_cb_ssp_io_request_get_lun(
+	void *scic_user_io_request)
+{
+	return isci_request_ssp_io_request_get_lun(scic_user_io_request);
+}
+
+/**
+ * scic_cb_ssp_io_request_get_task_attribute() - This callback method asks the
+ *    user to provide the task attribute associated with this IO request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the task attribute associated with this IO request.
+ */
+u32 scic_cb_ssp_io_request_get_task_attribute(
+	void *scic_user_io_request)
+{
+	return isci_request_ssp_io_request_get_task_attribute(
+		       scic_user_io_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_io_request_get_command_priority() - This callback method asks
+ *    the user to provide the command priority associated with this IO request.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the command priority associated with this IO request.
+ */
+u32 scic_cb_ssp_io_request_get_command_priority(
+	void *scic_user_io_request)
+{
+	return isci_request_ssp_io_request_get_command_priority(
+		       scic_user_io_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_task_request_get_lun() - This method returns the Logical Unit to
+ *    be utilized for this task management request.
+ * @scic_user_task_request: This parameter points to the user's task request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the LUN associated with this request. This should be u64?
+ */
+u32 scic_cb_ssp_task_request_get_lun(
+	void *scic_user_task_request)
+{
+	return isci_task_ssp_request_get_lun(
+		       (struct isci_request *)scic_user_task_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_task_request_get_function() - This method returns the task
+ *    management function to be utilized for this task request.
+ * @scic_user_task_request: This parameter points to the user's task request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns an unsigned byte representing the task management
+ * function to be performed.
+ */
+u8 scic_cb_ssp_task_request_get_function(
+	void *scic_user_task_request)
+{
+	return isci_task_ssp_request_get_function(
+		       (struct isci_request *)scic_user_task_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_task_request_get_io_tag_to_manage() - This method returns the
+ *    task management IO tag to be managed. Depending upon the task management
+ *    function the value returned from this method may be ignored.
+ * @scic_user_task_request: This parameter points to the user's task request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns an unsigned 16-bit word depicting the IO tag to be
+ * managed.
+ */
+u16 scic_cb_ssp_task_request_get_io_tag_to_manage(
+	void *scic_user_task_request)
+{
+	return isci_task_ssp_request_get_io_tag_to_manage(
+		       (struct isci_request *)scic_user_task_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_task_request_get_response_data_address() - This callback method
+ *    asks the user to provide the virtual address of the response data buffer
+ *    for the supplied IO request.
+ * @scic_user_task_request: This parameter points to the user's task request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the virtual address for the response data buffer
+ * associated with this IO request.
+ */
+void *scic_cb_ssp_task_request_get_response_data_address(
+	void *scic_user_task_request)
+{
+	return isci_task_ssp_request_get_response_data_address(
+		       (struct isci_request *)scic_user_task_request
+		       );
+}
+
+/**
+ * scic_cb_ssp_task_request_get_response_data_length() - This callback method
+ *    asks the user to provide the length of the response data buffer for the
+ *    supplied IO request.
+ * @scic_user_task_request: This parameter points to the user's task request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns the length of the response buffer data associated with
+ * this IO request.
+ */
+u32 scic_cb_ssp_task_request_get_response_data_length(
+	void *scic_user_task_request)
+{
+	return isci_task_ssp_request_get_response_data_length(
+		       (struct isci_request *)scic_user_task_request
+		       );
+}
+
+#if !defined(DISABLE_ATAPI)
+/**
+ * scic_cb_stp_packet_io_request_get_cdb_address() - This user callback asks
+ *    the user to provide stp packet io's the CDB address.
+ * @scic_user_io_request:
+ *
+ * The packet IO's cdb adress.
+ */
+void *scic_cb_stp_packet_io_request_get_cdb_address(
+	void *scic_user_io_request)
+{
+	return isci_request_stp_packet_io_request_get_cdb_address(
+		       scic_user_io_request
+		       );
+}
+
+
+/**
+ * scic_cb_stp_packet_io_request_get_cdb_length() - This user callback asks the
+ *    user to provide stp packet io's the CDB length.
+ * @scic_user_io_request:
+ *
+ * The packet IO's cdb length.
+ */
+u32 scic_cb_stp_packet_io_request_get_cdb_length(
+	void *scic_user_io_request)
+{
+	return isci_request_stp_packet_io_request_get_cdb_length(
+		       scic_user_io_request
+		       );
+}
+#endif /* #if !defined(DISABLE_ATAPI) */
+
+
+/**
+ * scic_cb_io_request_do_copy_rx_frames() - This callback method asks the user
+ *    if the received RX frame data is to be copied to the SGL or should be
+ *    stored by the SCI core to be retrieved later with the
+ *    scic_io_request_get_rx_frame().
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns true if the SCI core should copy the received frame data
+ * to the SGL location or false if the SCI user wants to retrieve the frame
+ * data at a later time.
+ */
+bool scic_cb_io_request_do_copy_rx_frames(
+	void *scic_user_io_request)
+{
+	struct sas_task *task
+		= isci_request_access_task(
+		(struct isci_request *)scic_user_io_request
+		);
+
+	return (task->data_dir == DMA_NONE) ? false : true;
+}
+
+/**
+ * scic_cb_get_virtual_address() - This callback method asks the user to
+ *    provide the virtual address for the supplied physical address.
+ * @controller: This parameter is the core controller object handle.
+ * @physical_address: This parameter is the physical address which is to be
+ *    returned as a virtual address.
+ *
+ * The method returns the virtual address for the supplied physical address.
+ */
+void *scic_cb_get_virtual_address(
+	struct scic_sds_controller *controller,
+	dma_addr_t physical_address)
+{
+	void *virt_addr = (void *)phys_to_virt(physical_address);
+
+	return virt_addr;
+}
+
+/**
+ * scic_cb_request_get_sat_protocol() - This callback method asks the user to
+ *    return the SAT protocol definition for this IO request.  This method is
+ *    only called by the SCI core if the request type constructed is SATA.
+ * @scic_user_io_request: This parameter points to the user's IO request
+ *    object.  It is a cookie that allows the user to provide the necessary
+ *    information for this callback.
+ *
+ * This method returns one of the sat.h defined protocols for the given io
+ * request.
+ */
+u8 scic_cb_request_get_sat_protocol(
+	void *scic_user_io_request)
+{
+	return isci_sata_get_sat_protocol(
+		       (struct isci_request *)scic_user_io_request
+		       );
+}
diff --git a/drivers/scsi/isci/events.c b/drivers/scsi/isci/events.c
new file mode 100644
index 0000000..75f9cd5
--- /dev/null
+++ b/drivers/scsi/isci/events.c
@@ -0,0 +1,619 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ */
+
+
+/**
+ * This file contains isci module object implementation.
+ *
+ *
+ */
+
+#include "isci.h"
+#include "request.h"
+#include "sata.h"
+#include "task.h"
+
+/**
+ * scic_cb_timer_create() - This callback method asks the user to create a
+ *    timer and provide a handle for this timer for use in further timer
+ *    interactions. The appropriate isci timer object function is called to
+ *    create a timer object.
+ * @timer_callback: This parameter specifies the callback method to be invoked
+ *    whenever the timer expires.
+ * @controller: This parameter specifies the controller with which this timer
+ *    is to be associated.
+ * @cookie: This parameter specifies a piece of information that the user must
+ *    retain.  This cookie is to be supplied by the user anytime a timeout
+ *    occurs for the created timer.
+ *
+ * This method returns a handle to a timer object created by the user.  The
+ * handle will be utilized for all further interactions relating to this timer.
+ */
+void *scic_cb_timer_create(
+	struct scic_sds_controller *controller,
+	void (*timer_callback)(void *),
+	void *cookie)
+{
+	struct isci_host *isci_host;
+	struct isci_timer *timer = NULL;
+
+	isci_host = (struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_host = %p",
+		__func__, isci_host);
+
+	timer = isci_timer_create(&isci_host->timer_list_struct,
+				  isci_host,
+				  cookie,
+				  timer_callback);
+
+	dev_dbg(&isci_host->pdev->dev, "%s: timer = %p\n", __func__, timer);
+
+	return (void *)timer;
+}
+
+
+/**
+ * scic_cb_timer_start() - This callback method asks the user to start the
+ *    supplied timer. The appropriate isci timer object function is called to
+ *    start the timer.
+ * @controller: This parameter specifies the controller with which this timer
+ *    is to associated.
+ * @timer: This parameter specifies the timer to be started.
+ * @milliseconds: This parameter specifies the number of milliseconds for which
+ *    to stall.  The operating system driver is allowed to round this value up
+ *    where necessary.
+ *
+ */
+void scic_cb_timer_start(
+	struct scic_sds_controller *controller,
+	void *timer,
+	u32 milliseconds)
+{
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_host = %p, timer = %p, milliseconds = %d\n",
+		__func__, isci_host, timer, milliseconds);
+
+	isci_timer_start((struct isci_timer *)timer, milliseconds);
+
+}
+
+/**
+ * scic_cb_timer_stop() - This callback method asks the user to stop the
+ *    supplied timer. The appropriate isci timer object function is called to
+ *    stop the timer.
+ * @controller: This parameter specifies the controller with which this timer
+ *    is to associated.
+ * @timer: This parameter specifies the timer to be stopped.
+ *
+ */
+void scic_cb_timer_stop(
+	struct scic_sds_controller *controller,
+	void *timer)
+{
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_host = %p, timer = %p\n",
+		__func__, isci_host, timer);
+
+	isci_timer_stop((struct isci_timer *)timer);
+}
+
+/**
+ * scic_cb_controller_start_complete() - This user callback will inform the
+ *    user that the controller has finished the start process. The associated
+ *    isci host adapter's start_complete function is called.
+ * @controller: This parameter specifies the controller that was started.
+ * @completion_status: This parameter specifies the results of the start
+ *    operation.  SCI_SUCCESS indicates successful completion.
+ *
+ */
+void scic_cb_controller_start_complete(
+	struct scic_sds_controller *controller,
+	enum sci_status completion_status)
+{
+	struct isci_host *isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_host = %p\n", __func__, isci_host);
+
+	isci_host_start_complete(isci_host, completion_status);
+}
+
+/**
+ * scic_cb_controller_stop_complete() - This user callback will inform the user
+ *    that the controller has finished the stop process. The associated isci
+ *    host adapter's start_complete function is called.
+ * @controller: This parameter specifies the controller that was stopped.
+ * @completion_status: This parameter specifies the results of the stop
+ *    operation.  SCI_SUCCESS indicates successful completion.
+ *
+ */
+void scic_cb_controller_stop_complete(
+	struct scic_sds_controller *controller,
+	enum sci_status completion_status)
+{
+	struct isci_host *isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: status = 0x%x\n", __func__, completion_status);
+	isci_host_stop_complete(isci_host, completion_status);
+}
+
+/**
+ * scic_cb_io_request_complete() - This user callback will inform the user that
+ *    an IO request has completed.
+ * @controller: This parameter specifies the controller on which the IO is
+ *    completing.
+ * @remote_device: This parameter specifies the remote device on which this IO
+ *    request is completing.
+ * @io_request: This parameter specifies the IO request that has completed.
+ * @completion_status: This parameter specifies the results of the IO request
+ *    operation.  SCI_SUCCESS indicates successful completion.
+ *
+ */
+void scic_cb_io_request_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device,
+	struct scic_sds_request *scic_io_request,
+	enum sci_io_status completion_status)
+{
+	struct isci_request *request;
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	request =
+		(struct isci_request *)sci_object_get_association(
+			scic_io_request
+			);
+
+	isci_request_io_request_complete(isci_host,
+					 request,
+					 completion_status);
+}
+
+/**
+ * scic_cb_task_request_complete() - This user callback will inform the user
+ *    that a task management request completed.
+ * @controller: This parameter specifies the controller on which the task
+ *    management request is completing.
+ * @remote_device: This parameter specifies the remote device on which this
+ *    task management request is completing.
+ * @task_request: This parameter specifies the task management request that has
+ *    completed.
+ * @completion_status: This parameter specifies the results of the IO request
+ *    operation.  SCI_SUCCESS indicates successful completion.
+ *
+ */
+void scic_cb_task_request_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device,
+	struct scic_sds_request *scic_task_request,
+	enum sci_task_status completion_status)
+{
+	struct isci_request *request;
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	request =
+		(struct isci_request *)sci_object_get_association(
+			scic_task_request);
+
+	isci_task_request_complete(isci_host, request, completion_status);
+}
+
+/**
+ * scic_cb_port_stop_complete() - This method informs the user when a stop
+ *    operation on the port has completed.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.
+ * @completion_status: This parameter specifies the status for the operation
+ *    being completed.
+ *
+ */
+void scic_cb_port_stop_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	enum sci_status completion_status)
+{
+	pr_warn("%s:************************************************\n",
+		__func__);
+}
+
+/**
+ * scic_cb_port_hard_reset_complete() - This method informs the user when a
+ *    hard reset on the port has completed.  This hard reset could have been
+ *    initiated by the user or by the remote port.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.
+ * @completion_status: This parameter specifies the status for the operation
+ *    being completed.
+ *
+ */
+void scic_cb_port_hard_reset_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	enum sci_status completion_status)
+{
+	struct isci_port *isci_port
+		= (struct isci_port *)sci_object_get_association(port);
+
+	isci_port_hard_reset_complete(isci_port, completion_status);
+}
+
+/**
+ * scic_cb_port_ready() - This method informs the user that the port is now in
+ *    a ready state and can be utilized to issue IOs.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.
+ *
+ */
+void scic_cb_port_ready(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port)
+{
+	struct isci_port *isci_port;
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	isci_port =
+		(struct isci_port *)sci_object_get_association(port);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_port = %p\n", __func__, isci_port);
+
+	isci_port_ready(isci_host, isci_port);
+}
+
+/**
+ * scic_cb_port_not_ready() - This method informs the user that the port is now
+ *    not in a ready (i.e. busy) state and can't be utilized to issue IOs.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.
+ *
+ */
+void scic_cb_port_not_ready(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	u32 reason_code)
+{
+	struct isci_port *isci_port;
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	isci_port =
+		(struct isci_port *)sci_object_get_association(port);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_port = %p\n", __func__, isci_port);
+
+	isci_port_not_ready(isci_host, isci_port);
+}
+
+/**
+ * scic_cb_port_invalid_link_up() - This method informs the SCI Core user that
+ *    a phy/link became ready, but the phy is not allowed in the port.  In some
+ *    situations the underlying hardware only allows for certain phy to port
+ *    mappings.  If these mappings are violated, then this API is invoked.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.
+ * @phy: This parameter specifies the phy that came ready, but the phy can't be
+ *    a valid member of the port.
+ *
+ */
+void scic_cb_port_invalid_link_up(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	struct scic_sds_phy *phy)
+{
+	pr_warn("%s:************************************************\n",
+		__func__);
+}
+
+/**
+ * scic_cb_port_bc_change_primitive_received() - This callback method informs
+ *    the user that a broadcast change primitive was received.
+ * @controller: This parameter represents the controller which contains the
+ *    port.
+ * @port: This parameter specifies the SCI port object for which the callback
+ *    is being invoked.  For instances where the phy on which the primitive was
+ *    received is not part of a port, this parameter will be
+ *    SCI_INVALID_HANDLE_T.
+ * @phy: This parameter specifies the phy on which the primitive was received.
+ *
+ */
+void scic_cb_port_bc_change_primitive_received(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	struct scic_sds_phy *phy)
+{
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: port = %p, phy = %p\n", __func__, port, phy);
+	isci_port_bc_change_received(isci_host, port, phy);
+}
+
+
+
+
+/**
+ * scic_cb_port_link_up() - This callback method informs the user that a phy
+ *    has become operational and is capable of communicating with the remote
+ *    end point.
+ * @controller: This parameter represents the controller associated with the
+ *    phy.
+ * @port: This parameter specifies the port object for which the user callback
+ *    is being invoked.  There may be conditions where this parameter can be
+ *    SCI_INVALID_HANDLE
+ * @phy: This parameter specifies the phy object for which the user callback is
+ *    being invoked.
+ *
+ * none.
+ */
+void scic_cb_port_link_up(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	struct scic_sds_phy *phy)
+{
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: phy = %p\n", __func__, phy);
+
+	isci_port_link_up(isci_host, port, phy);
+}
+
+/**
+ * scic_cb_port_link_down() - This callback method informs the user that a phy
+ *    is no longer operational and is not capable of communicating with the
+ *    remote end point.
+ * @controller: This parameter represents the controller associated with the
+ *    phy.
+ * @port: This parameter specifies the port object for which the user callback
+ *    is being invoked.  There may be conditions where this parameter can be
+ *    SCI_INVALID_HANDLE
+ * @phy: This parameter specifies the phy object for which the user callback is
+ *    being invoked.
+ *
+ * none.
+ */
+void scic_cb_port_link_down(
+	struct scic_sds_controller *controller,
+	struct scic_sds_port *port,
+	struct scic_sds_phy *phy)
+{
+	struct isci_host *isci_host;
+	struct isci_phy *isci_phy;
+	struct isci_port *isci_port;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	isci_phy =
+		(struct isci_phy *)sci_object_get_association(phy);
+
+	isci_port =
+		(struct isci_port *)sci_object_get_association(port);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_port = %p\n", __func__, isci_port);
+
+	isci_port_link_down(isci_host, isci_phy, isci_port);
+}
+
+/**
+ * scic_cb_remote_device_start_complete() - This user callback method will
+ *    inform the user that a start operation has completed.
+ * @controller: This parameter specifies the core controller associated with
+ *    the completion callback.
+ * @remote_device: This parameter specifies the remote device associated with
+ *    the completion callback.
+ * @completion_status: This parameter specifies the completion status for the
+ *    operation.
+ *
+ */
+void scic_cb_remote_device_start_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device,
+	enum sci_status completion_status)
+{
+	struct isci_host *isci_host;
+	struct isci_remote_device *isci_device;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	isci_device =
+		(struct isci_remote_device *)sci_object_get_association(
+			remote_device
+			);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	isci_remote_device_start_complete(
+		isci_host, isci_device, completion_status);
+
+}
+
+/**
+ * scic_cb_remote_device_stop_complete() - This user callback method will
+ *    inform the user that a stop operation has completed.
+ * @controller: This parameter specifies the core controller associated with
+ *    the completion callback.
+ * @remote_device: This parameter specifies the remote device associated with
+ *    the completion callback.
+ * @completion_status: This parameter specifies the completion status for the
+ *    operation.
+ *
+ */
+void scic_cb_remote_device_stop_complete(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device,
+	enum sci_status completion_status)
+{
+	struct isci_host *isci_host;
+	struct isci_remote_device *isci_device;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	isci_device =
+		(struct isci_remote_device *)sci_object_get_association(
+			remote_device
+			);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	isci_remote_device_stop_complete(
+		isci_host, isci_device, completion_status);
+
+}
+
+/**
+ * scic_cb_remote_device_ready() - This user callback method will inform the
+ *    user that a remote device is now capable of handling IO requests.
+ * @controller: This parameter specifies the core controller associated with
+ *    the completion callback.
+ * @remote_device: This parameter specifies the remote device associated with
+ *    the callback.
+ *
+ */
+void scic_cb_remote_device_ready(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device)
+{
+	struct isci_remote_device *isci_device =
+		(struct isci_remote_device *)
+		sci_object_get_association(remote_device);
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	isci_remote_device_ready(isci_device);
+}
+
+/**
+ * scic_cb_remote_device_not_ready() - This user callback method will inform
+ *    the user that a remote device is no longer capable of handling IO
+ *    requests (until a ready callback is invoked).
+ * @controller: This parameter specifies the core controller associated with
+ *    the completion callback.
+ * @remote_device: This parameter specifies the remote device associated with
+ *    the callback.
+ * @reason_code: This parameter specifies the reason for the remote device
+ *    going to a not ready state.
+ *
+ */
+void scic_cb_remote_device_not_ready(
+	struct scic_sds_controller *controller,
+	struct scic_sds_remote_device *remote_device,
+	u32 reason_code)
+{
+	struct isci_remote_device *isci_device =
+		(struct isci_remote_device *)
+		sci_object_get_association(remote_device);
+
+	struct isci_host *isci_host;
+
+	isci_host =
+		(struct isci_host *)sci_object_get_association(controller);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p, reason_code = %x\n",
+		__func__, isci_device, reason_code);
+
+	isci_remote_device_not_ready(isci_device, reason_code);
+}
+
+
diff --git a/drivers/scsi/isci/timers.c b/drivers/scsi/isci/timers.c
new file mode 100644
index 0000000..ca72308
--- /dev/null
+++ b/drivers/scsi/isci/timers.c
@@ -0,0 +1,319 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ */
+
+#include "isci.h"
+#include "timers.h"
+
+
+/**
+ * isci_timer_list_construct() - This method contrucst the SCI Timer List
+ *    object used by the SCI Module class. The construction process involves
+ *    creating isci_timer objects and adding them to the SCI Timer List
+ *    object's list member. The number of isci_timer objects is determined by
+ *    the timer_list_size parameter.
+ * @isci_timer_list: This parameter points to the SCI Timer List object being
+ *    constructed. The calling routine is responsible for allocating the memory
+ *    for isci_timer_list and initializing the timer list_head member of
+ *    isci_timer_list.
+ * @timer_list_size: This parameter specifies the number of isci_timer objects
+ *    contained by the SCI Timer List. which this timer is to be associated.
+ *
+ * This method returns an error code indicating sucess or failure. The user
+ * should check for possible memory allocation error return otherwise, a zero
+ * indicates success.
+ */
+int isci_timer_list_construct(
+	struct isci_timer_list *isci_timer_list,
+	int timer_list_size)
+{
+	struct isci_timer *isci_timer;
+	int i;
+	int err = 0;
+
+
+	for (i = 0; i < timer_list_size; i++) {
+
+		isci_timer = kzalloc(sizeof(*isci_timer), GFP_KERNEL);
+
+		if (!isci_timer) {
+
+			err = -ENOMEM;
+			break;
+		}
+		isci_timer->used = 0;
+		isci_timer->stopped = 1;
+		isci_timer->parent = isci_timer_list;
+		list_add(&isci_timer->node, &isci_timer_list->timers);
+	}
+
+	return 0;
+
+}
+
+
+/**
+ * isci_timer_list_destroy() - This method destroys the SCI Timer List object
+ *    used by the SCI Module class. The destruction  process involves freeing
+ *    memory allocated for isci_timer objects on the SCI Timer List object's
+ *    timers list_head member. If any isci_timer objects are mark as "in use",
+ *    they are not freed and the function returns an error code of -EBUSY.
+ * @isci_timer_list: This parameter points to the SCI Timer List object being
+ *    destroyed.
+ *
+ * This method returns an error code indicating sucess or failure. The user
+ * should check for possible -EBUSY error return, in the event of one or more
+ * isci_timers still "in use", otherwise, a zero indicates success.
+ */
+int isci_timer_list_destroy(
+	struct isci_timer_list *isci_timer_list)
+{
+	struct isci_timer *timer, *tmp;
+
+	list_for_each_entry_safe(timer, tmp, &isci_timer_list->timers, node) {
+		isci_timer_free(isci_timer_list, timer);
+		list_del(&timer->node);
+		kfree(timer);
+	}
+	return 0;
+}
+
+
+
+static void isci_timer_restart(struct isci_timer *isci_timer)
+{
+	struct timer_list *timer =
+		&isci_timer->timer;
+	unsigned long timeout;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	isci_timer->restart = 0;
+	isci_timer->stopped = 0;
+	timeout = isci_timer->timeout_value;
+	timeout = (timeout * HZ) / 1000;
+	timeout = timeout ? timeout : 1;
+	mod_timer(timer, jiffies + timeout);
+}
+
+/**
+ * This method pulls an isci_timer object off of the list for the SCI Timer
+ *    List object specified, marks the isci_timer as "in use" and initializes
+ *    it with user callback function and cookie data. The timer is not start at
+ *    this time, just reserved for the user.
+ * @isci_timer_list: This parameter points to the SCI Timer List from which the
+ *    timer is reserved.
+ * @cookie: This parameter specifies a piece of information that the user must
+ *    retain.  This cookie is to be supplied by the user anytime a timeout
+ *    occurs for the created timer.
+ * @timer_callback: This parameter specifies the callback method to be invoked
+ *    whenever the timer expires.
+ *
+ * This method returns a pointer to an isci_timer object reserved from the SCI
+ * Timer List.  The pointer will be utilized for all further interactions
+ * relating to this timer.
+ */
+
+static void timer_function(unsigned long data)
+{
+
+	struct isci_timer *timer     = (struct isci_timer *)data;
+	struct isci_host *isci_host = timer->isci_host;
+	unsigned long flags;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, timer);
+
+	if (isci_stopped == isci_host_get_state(isci_host)) {
+		timer->stopped = 1;
+		return;
+	}
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	if (!timer->stopped) {
+		timer->stopped = 1;
+		timer->timer_callback(timer->cookie);
+
+		if (timer->restart)
+			isci_timer_restart(timer);
+	}
+
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+}
+
+
+struct isci_timer *isci_timer_create(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_host *isci_host,
+	void *cookie,
+	void (*timer_callback)(void *))
+{
+
+	struct timer_list *timer;
+	struct isci_timer *isci_timer;
+	struct list_head *timer_list =
+		&isci_timer_list->timers;
+	unsigned long flags;
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	if (list_empty(timer_list)) {
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+		return NULL;
+	}
+
+	isci_timer = list_entry(timer_list->next, struct isci_timer, node);
+
+	if (isci_timer->used) {
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+		return NULL;
+	}
+	isci_timer->used = 1;
+	isci_timer->stopped = 1;
+	list_move_tail(&isci_timer->node, timer_list);
+
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+	timer = &isci_timer->timer;
+	timer->data = (unsigned long)isci_timer;
+	timer->function = timer_function;
+	isci_timer->cookie = cookie;
+	isci_timer->timer_callback = timer_callback;
+	isci_timer->isci_host = isci_host;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	return isci_timer;
+}
+
+/**
+ * isci_timer_free() - This method frees the isci_timer, marking it "free to
+ *    use", then places its back at the head of the timers list for the SCI
+ *    Timer List object specified.
+ * @isci_timer_list: This parameter points to the SCI Timer List from which the
+ *    timer is reserved.
+ * @isci_timer: This parameter specifies the timer to be freed.
+ *
+ */
+void isci_timer_free(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_timer *isci_timer)
+{
+	struct list_head *timer_list = &isci_timer_list->timers;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	if (list_empty(timer_list))
+		return;
+
+	isci_timer->used = 0;
+	list_move(&isci_timer->node, timer_list);
+
+	if (!isci_timer->stopped) {
+		del_timer(&isci_timer->timer);
+		isci_timer->stopped = 1;
+	}
+}
+
+/**
+ * isci_timer_start() - This method starts the specified isci_timer, with the
+ *    specified timeout value.
+ * @isci_timer: This parameter specifies the timer to be started.
+ * @timeout: This parameter specifies the timeout, in milliseconds, after which
+ *    the associated callback function will be called.
+ *
+ */
+void isci_timer_start(
+	struct isci_timer *isci_timer,
+	unsigned long timeout)
+{
+	struct timer_list *timer = &isci_timer->timer;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	isci_timer->timeout_value = timeout;
+	init_timer(timer);
+	timeout = (timeout * HZ) / 1000;
+	timeout = timeout ? timeout : 1;
+
+	timer->expires = jiffies + timeout;
+	timer->data = (unsigned long)isci_timer;
+	timer->function = timer_function;
+	isci_timer->stopped = 0;
+	isci_timer->restart = 0;
+	add_timer(timer);
+}
+
+/**
+ * isci_timer_stop() - This method stops the supplied isci_timer.
+ * @isci_timer: This parameter specifies the isci_timer to be stopped.
+ *
+ */
+void isci_timer_stop(struct isci_timer *isci_timer)
+{
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	if (isci_timer->stopped)
+		return;
+
+	isci_timer->stopped = 1;
+
+	del_timer(&isci_timer->timer);
+}
diff --git a/drivers/scsi/isci/timers.h b/drivers/scsi/isci/timers.h
new file mode 100644
index 0000000..ca5c215
--- /dev/null
+++ b/drivers/scsi/isci/timers.h
@@ -0,0 +1,126 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ */
+
+#if !defined(_SCI_TIMER_H_)
+#define _SCI_TIMER_H_
+
+#include <linux/timer.h>
+#include <linux/types.h>
+
+/***************************************************
+ * isci_timer
+ ***************************************************
+ */
+/**
+ * struct isci_timer_list - This class is the container for all isci_timer
+ *    objects
+ *
+ *
+ */
+struct isci_timer_list {
+
+	struct list_head timers;
+};
+
+/**
+ * struct isci_timer - This class represents the timer object used by SCIC. It
+ *    wraps the Linux timer_list object.
+ *
+ *
+ */
+struct isci_timer {
+	int used;
+	int stopped;
+	int restart;
+	int timeout_value;
+	void *cookie;
+	void (*timer_callback)(void *);
+	struct list_head node;
+	struct timer_list timer;
+	struct isci_timer_list *parent;
+	struct isci_host *isci_host;
+};
+
+#define to_isci_timer(t)	\
+	container_of(t, struct isci_timer, timer);
+
+int isci_timer_list_construct(
+	struct isci_timer_list *isci_timer_list,
+	int timer_list_size);
+
+
+int isci_timer_list_destroy(
+	struct isci_timer_list *isci_timer_list);
+
+struct isci_timer *isci_timer_create(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_host *isci_host,
+	void *cookie,
+	void (*timer_callback)(void *));
+
+void isci_timer_free(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_timer *isci_timer);
+
+void isci_timer_start(
+	struct isci_timer *isci_timer,
+	unsigned long timeout);
+
+void isci_timer_stop(
+	struct isci_timer *isci_timer);
+
+
+#endif /* !defined (_SCI_TIMER_H_) */
+