[deliverable/linux.git] / drivers / scsi / isci / core / scic_sds_port.c

/*
 * 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 "scic_controller.h"
#include "scic_phy.h"
#include "scic_port.h"
#include "scic_sds_controller.h"
#include "scic_sds_phy.h"
#include "scic_sds_port.h"
#include "remote_device.h"
#include "remote_node_context.h"
#include "scic_sds_request.h"
#include "sci_environment.h"
#include "scu_registers.h"

#define SCIC_SDS_PORT_MIN_TIMER_COUNT  (SCI_MAX_PORTS)
#define SCIC_SDS_PORT_MAX_TIMER_COUNT  (SCI_MAX_PORTS)

#define SCIC_SDS_PORT_HARD_RESET_TIMEOUT  (1000)
#define SCU_DUMMY_INDEX    (0xFFFF)


/**
 *
 * @sci_port: This is the port object to which the phy is being assigned.
 * @phy_index: This is the phy index that is being assigned to the port.
 *
 * This method will return a true value if the specified phy can be assigned to
 * this port The following is a list of phys for each port that are allowed: -
 * Port 0 - 3 2 1 0 - Port 1 -     1 - Port 2 - 3 2 - Port 3 - 3 This method
 * doesn't preclude all configurations.  It merely ensures that a phy is part
 * of the allowable set of phy identifiers for that port.  For example, one
 * could assign phy 3 to port 0 and no other phys.  Please refer to
 * scic_sds_port_is_phy_mask_valid() for information regarding whether the
 * phy_mask for a port can be supported. bool true if this is a valid phy
 * assignment for the port false if this is not a valid phy assignment for the
 * port
 */
bool scic_sds_port_is_valid_phy_assignment(
	struct scic_sds_port *sci_port,
	u32 phy_index)
{
	/* Initialize to invalid value. */
	u32 existing_phy_index = SCI_MAX_PHYS;
	u32 index;

	if ((sci_port->physical_port_index == 1) && (phy_index != 1)) {
		return false;
	}

	if (sci_port->physical_port_index == 3 && phy_index != 3) {
		return false;
	}

	if (
		(sci_port->physical_port_index == 2)
		&& ((phy_index == 0) || (phy_index == 1))
		) {
		return false;
	}

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if ((sci_port->phy_table[index] != NULL)
		    && (index != phy_index)) {
			existing_phy_index = index;
		}
	}

	/*
	 * Ensure that all of the phys in the port are capable of
	 * operating at the same maximum link rate. */
	if (
		(existing_phy_index < SCI_MAX_PHYS)
		&& (sci_port->owning_controller->user_parameters.sds1.phys[
			    phy_index].max_speed_generation !=
		    sci_port->owning_controller->user_parameters.sds1.phys[
			    existing_phy_index].max_speed_generation)
		)
		return false;

	return true;
}

/**
 * This method requests a list (mask) of the phys contained in the supplied SAS
 *    port.
 * @sci_port: a handle corresponding to the SAS port for which to return the
 *    phy mask.
 *
 * Return a bit mask indicating which phys are a part of this port. Each bit
 * corresponds to a phy identifier (e.g. bit 0 = phy id 0).
 */
static u32 scic_sds_port_get_phys(struct scic_sds_port *sci_port)
{
	u32 index;
	u32 mask;

	mask = 0;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->phy_table[index] != NULL) {
			mask |= (1 << index);
		}
	}

	return mask;
}

/**
 *
 * @sci_port: This is the port object for which to determine if the phy mask
 *    can be supported.
 *
 * This method will return a true value if the port's phy mask can be supported
 * by the SCU. The following is a list of valid PHY mask configurations for
 * each port: - Port 0 - [[3  2] 1] 0 - Port 1 -        [1] - Port 2 - [[3] 2]
 * - Port 3 -  [3] This method returns a boolean indication specifying if the
 * phy mask can be supported. true if this is a valid phy assignment for the
 * port false if this is not a valid phy assignment for the port
 */
static bool scic_sds_port_is_phy_mask_valid(
	struct scic_sds_port *sci_port,
	u32 phy_mask)
{
	if (sci_port->physical_port_index == 0) {
		if (((phy_mask & 0x0F) == 0x0F)
		    || ((phy_mask & 0x03) == 0x03)
		    || ((phy_mask & 0x01) == 0x01)
		    || (phy_mask == 0))
			return true;
	} else if (sci_port->physical_port_index == 1) {
		if (((phy_mask & 0x02) == 0x02)
		    || (phy_mask == 0))
			return true;
	} else if (sci_port->physical_port_index == 2) {
		if (((phy_mask & 0x0C) == 0x0C)
		    || ((phy_mask & 0x04) == 0x04)
		    || (phy_mask == 0))
			return true;
	} else if (sci_port->physical_port_index == 3) {
		if (((phy_mask & 0x08) == 0x08)
		    || (phy_mask == 0))
			return true;
	}

	return false;
}

/**
 *
 * @sci_port: This parameter specifies the port from which to return a
 *    connected phy.
 *
 * This method retrieves a currently active (i.e. connected) phy contained in
 * the port.  Currently, the lowest order phy that is connected is returned.
 * This method returns a pointer to a SCIS_SDS_PHY object. NULL This value is
 * returned if there are no currently active (i.e. connected to a remote end
 * point) phys contained in the port. All other values specify a struct scic_sds_phy
 * object that is active in the port.
 */
static struct scic_sds_phy *scic_sds_port_get_a_connected_phy(
	struct scic_sds_port *sci_port
	) {
	u32 index;
	struct scic_sds_phy *phy;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		/*
		 * Ensure that the phy is both part of the port and currently
		 * connected to the remote end-point. */
		phy = sci_port->phy_table[index];
		if (
			(phy != NULL)
			&& scic_sds_port_active_phy(sci_port, phy)
			) {
			return phy;
		}
	}

	return NULL;
}

/**
 * scic_sds_port_set_phy() -
 * @out]: port The port object to which the phy assignement is being made.
 * @out]: phy The phy which is being assigned to the port.
 *
 * This method attempts to make the assignment of the phy to the port. If
 * successful the phy is assigned to the ports phy table. bool true if the phy
 * assignment can be made. false if the phy assignement can not be made. This
 * is a functional test that only fails if the phy is currently assigned to a
 * different port.
 */
static enum sci_status scic_sds_port_set_phy(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	/*
	 * Check to see if we can add this phy to a port
	 * that means that the phy is not part of a port and that the port does
	 * not already have a phy assinged to the phy index. */
	if (
		(port->phy_table[phy->phy_index] == NULL)
		&& (scic_sds_phy_get_port(phy) == NULL)
		&& scic_sds_port_is_valid_phy_assignment(port, phy->phy_index)
		) {
		/*
		 * Phy is being added in the stopped state so we are in MPC mode
		 * make logical port index = physical port index */
		port->logical_port_index = port->physical_port_index;
		port->phy_table[phy->phy_index] = phy;
		scic_sds_phy_set_port(phy, port);

		return SCI_SUCCESS;
	}

	return SCI_FAILURE;
}

/**
 * scic_sds_port_clear_phy() -
 * @out]: port The port from which the phy is being cleared.
 * @out]: phy The phy being cleared from the port.
 *
 * This method will clear the phy assigned to this port.  This method fails if
 * this phy is not currently assinged to this port. bool true if the phy is
 * removed from the port. false if this phy is not assined to this port.
 */
static enum sci_status scic_sds_port_clear_phy(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	/* Make sure that this phy is part of this port */
	if (port->phy_table[phy->phy_index] == phy &&
	    scic_sds_phy_get_port(phy) == port) {
		struct scic_sds_controller *scic = port->owning_controller;
		struct isci_host *ihost = scic_to_ihost(scic);

		/* Yep it is assigned to this port so remove it */
		scic_sds_phy_set_port(phy, &ihost->ports[SCI_MAX_PORTS].sci);
		port->phy_table[phy->phy_index] = NULL;
		return SCI_SUCCESS;
	}

	return SCI_FAILURE;
}

/**
 * scic_sds_port_add_phy() -
 * @sci_port: This parameter specifies the port in which the phy will be added.
 * @sci_phy: This parameter is the phy which is to be added to the port.
 *
 * This method will add a PHY to the selected port. This method returns an
 * enum sci_status. SCI_SUCCESS the phy has been added to the port. Any other status
 * is failre to add the phy to the port.
 */
enum sci_status scic_sds_port_add_phy(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	return sci_port->state_handlers->add_phy_handler(
		       sci_port, sci_phy);
}


/**
 * scic_sds_port_remove_phy() -
 * @sci_port: This parameter specifies the port in which the phy will be added.
 * @sci_phy: This parameter is the phy which is to be added to the port.
 *
 * This method will remove the PHY from the selected PORT. This method returns
 * an enum sci_status. SCI_SUCCESS the phy has been removed from the port. Any other
 * status is failre to add the phy to the port.
 */
enum sci_status scic_sds_port_remove_phy(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	return sci_port->state_handlers->remove_phy_handler(
		       sci_port, sci_phy);
}

/**
 * This method requests the SAS address for the supplied SAS port from the SCI
 *    implementation.
 * @sci_port: a handle corresponding to the SAS port for which to return the
 *    SAS address.
 * @sas_address: This parameter specifies a pointer to a SAS address structure
 *    into which the core will copy the SAS address for the port.
 *
 */
void scic_sds_port_get_sas_address(
	struct scic_sds_port *sci_port,
	struct sci_sas_address *sas_address)
{
	u32 index;

	sas_address->high = 0;
	sas_address->low  = 0;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->phy_table[index] != NULL) {
			scic_sds_phy_get_sas_address(sci_port->phy_table[index], sas_address);
		}
	}
}

/*
 * This function will indicate which protocols are supported by this port.
 * @sci_port: a handle corresponding to the SAS port for which to return the
 *    supported protocols.
 * @protocols: This parameter specifies a pointer to a data structure
 *    which the core will copy the protocol values for the port from the
 *    transmit_identification register.
 */
static void
scic_sds_port_get_protocols(struct scic_sds_port *sci_port,
			    struct scic_phy_proto *protocols)
{
	u8 index;

	protocols->all = 0;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->phy_table[index] != NULL) {
			scic_sds_phy_get_protocols(sci_port->phy_table[index],
						   protocols);
		}
	}
}

/*
 * This function requests the SAS address for the device directly attached to
 *    this SAS port.
 * @sci_port: a handle corresponding to the SAS port for which to return the
 *    SAS address.
 * @sas_address: This parameter specifies a pointer to a SAS address structure
 *    into which the core will copy the SAS address for the device directly
 *    attached to the port.
 *
 */
void scic_sds_port_get_attached_sas_address(
	struct scic_sds_port *sci_port,
	struct sci_sas_address *sas_address)
{
	struct scic_sds_phy *sci_phy;

	/*
	 * Ensure that the phy is both part of the port and currently
	 * connected to the remote end-point.
	 */
	sci_phy = scic_sds_port_get_a_connected_phy(sci_port);
	if (sci_phy) {
		if (sci_phy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA) {
			scic_sds_phy_get_attached_sas_address(sci_phy,
							      sas_address);
		} else {
			scic_sds_phy_get_sas_address(sci_phy, sas_address);
			sas_address->low += sci_phy->phy_index;
		}
	} else {
		sas_address->high = 0;
		sas_address->low  = 0;
	}
}

/**
 * scic_sds_port_construct_dummy_rnc() - create dummy rnc for si workaround
 *
 * @sci_port: logical port on which we need to create the remote node context
 * @rni: remote node index for this remote node context.
 *
 * This routine will construct a dummy remote node context data structure
 * This structure will be posted to the hardware to work around a scheduler
 * error in the hardware.
 */
static void scic_sds_port_construct_dummy_rnc(struct scic_sds_port *sci_port, u16 rni)
{
	union scu_remote_node_context *rnc;

	rnc = &sci_port->owning_controller->remote_node_context_table[rni];

	memset(rnc, 0, sizeof(union scu_remote_node_context));

	rnc->ssp.remote_sas_address_hi = 0;
	rnc->ssp.remote_sas_address_lo = 0;

	rnc->ssp.remote_node_index = rni;
	rnc->ssp.remote_node_port_width = 1;
	rnc->ssp.logical_port_index = sci_port->physical_port_index;

	rnc->ssp.nexus_loss_timer_enable = false;
	rnc->ssp.check_bit = false;
	rnc->ssp.is_valid = true;
	rnc->ssp.is_remote_node_context = true;
	rnc->ssp.function_number = 0;
	rnc->ssp.arbitration_wait_time = 0;
}

/**
 * scic_sds_port_construct_dummy_task() - create dummy task for si workaround
 * @sci_port The logical port on which we need to create the
 *            remote node context.
 *            context.
 * @tci The remote node index for this remote node context.
 *
 * This routine will construct a dummy task context data structure.  This
 * structure will be posted to the hardwre to work around a scheduler error
 * in the hardware.
 *
 */
static void scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u16 tci)
{
	struct scu_task_context *task_context;

	task_context = scic_sds_controller_get_task_context_buffer(sci_port->owning_controller, tci);

	memset(task_context, 0, sizeof(struct scu_task_context));

	task_context->abort = 0;
	task_context->priority = 0;
	task_context->initiator_request = 1;
	task_context->connection_rate = 1;
	task_context->protocol_engine_index = 0;
	task_context->logical_port_index = sci_port->physical_port_index;
	task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
	task_context->task_index = scic_sds_io_tag_get_index(tci);
	task_context->valid = SCU_TASK_CONTEXT_VALID;
	task_context->context_type = SCU_TASK_CONTEXT_TYPE;

	task_context->remote_node_index = sci_port->reserved_rni;
	task_context->command_code = 0;

	task_context->link_layer_control = 0;
	task_context->do_not_dma_ssp_good_response = 1;
	task_context->strict_ordering = 0;
	task_context->control_frame = 0;
	task_context->timeout_enable = 0;
	task_context->block_guard_enable = 0;

	task_context->address_modifier = 0;

	task_context->task_phase = 0x01;
}

static void scic_sds_port_destroy_dummy_resources(struct scic_sds_port *sci_port)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;

	if (sci_port->reserved_tci != SCU_DUMMY_INDEX)
		scic_controller_free_io_tag(scic, sci_port->reserved_tci);

	if (sci_port->reserved_rni != SCU_DUMMY_INDEX)
		scic_sds_remote_node_table_release_remote_node_index(&scic->available_remote_nodes,
								     1, sci_port->reserved_rni);

	sci_port->reserved_rni = SCU_DUMMY_INDEX;
	sci_port->reserved_tci = SCU_DUMMY_INDEX;
}

/**
 * This method performs initialization of the supplied port. Initialization
 *    includes: - state machine initialization - member variable initialization
 *    - configuring the phy_mask
 * @sci_port:
 * @transport_layer_registers:
 * @port_task_scheduler_registers:
 * @port_configuration_regsiter:
 *
 * enum sci_status SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION This value is returned
 * if the phy being added to the port
 */
enum sci_status scic_sds_port_initialize(
	struct scic_sds_port *sci_port,
	void __iomem *port_task_scheduler_registers,
	void __iomem *port_configuration_regsiter,
	void __iomem *viit_registers)
{
	sci_port->port_task_scheduler_registers  = port_task_scheduler_registers;
	sci_port->port_pe_configuration_register = port_configuration_regsiter;
	sci_port->viit_registers                 = viit_registers;

	return SCI_SUCCESS;
}

/**
 * scic_port_get_properties() - This method simply returns the properties
 *    regarding the port, such as: physical index, protocols, sas address, etc.
 * @port: this parameter specifies the port for which to retrieve the physical
 *    index.
 * @properties: This parameter specifies the properties structure into which to
 *    copy the requested information.
 *
 * Indicate if the user specified a valid port. SCI_SUCCESS This value is
 * returned if the specified port was valid. SCI_FAILURE_INVALID_PORT This
 * value is returned if the specified port is not valid.  When this value is
 * returned, no data is copied to the properties output parameter.
 */
enum sci_status scic_port_get_properties(
	struct scic_sds_port *port,
	struct scic_port_properties *prop)
{
	if ((port == NULL) ||
	    (port->logical_port_index == SCIC_SDS_DUMMY_PORT))
		return SCI_FAILURE_INVALID_PORT;

	prop->index    = port->logical_port_index;
	prop->phy_mask = scic_sds_port_get_phys(port);
	scic_sds_port_get_sas_address(port, &prop->local.sas_address);
	scic_sds_port_get_protocols(port, &prop->local.protocols);
	scic_sds_port_get_attached_sas_address(port, &prop->remote.sas_address);

	return SCI_SUCCESS;
}

/**
 * scic_port_hard_reset() - perform port hard reset
 * @port: a handle corresponding to the SAS port to be hard reset.
 * @reset_timeout: This parameter specifies the number of milliseconds in which
 *    the port reset operation should complete.
 *
 * The SCI User callback in scic_user_callbacks_t will only be called once for
 * each phy in the SAS Port at completion of the hard reset sequence. Return a
 * status indicating whether the hard reset started successfully. SCI_SUCCESS
 * This value is returned if the hard reset operation started successfully.
 */
enum sci_status scic_port_hard_reset(
	struct scic_sds_port *port,
	u32 reset_timeout)
{
	return port->state_handlers->reset_handler(
		       port, reset_timeout);
}

/**
 * This method assigns the direct attached device ID for this port.
 *
 * @param[in] sci_port The port for which the direct attached device id is to
 *       be assigned.
 * @param[in] device_id The direct attached device ID to assign to the port.
 *       This will be the RNi for the device
 */
void scic_sds_port_setup_transports(
	struct scic_sds_port *sci_port,
	u32 device_id)
{
	u8 index;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->active_phy_mask & (1 << index))
			scic_sds_phy_setup_transport(sci_port->phy_table[index], device_id);
	}
}

/**
 *
 * @sci_port: This is the port on which the phy should be enabled.
 * @sci_phy: This is the specific phy which to enable.
 * @do_notify_user: This parameter specifies whether to inform the user (via
 *    scic_cb_port_link_up()) as to the fact that a new phy as become ready.
 *
 * This function will activate the phy in the port.
 * Activation includes: - adding
 * the phy to the port - enabling the Protocol Engine in the silicon. -
 * notifying the user that the link is up. none
 */
static void scic_sds_port_activate_phy(struct scic_sds_port *sci_port,
				       struct scic_sds_phy *sci_phy,
				       bool do_notify_user)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);

	if (sci_phy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA)
		scic_sds_phy_resume(sci_phy);

	sci_port->active_phy_mask |= 1 << sci_phy->phy_index;

	scic_sds_controller_clear_invalid_phy(scic, sci_phy);

	if (do_notify_user == true)
		isci_port_link_up(ihost, sci_port, sci_phy);
}

void scic_sds_port_deactivate_phy(struct scic_sds_port *sci_port,
				  struct scic_sds_phy *sci_phy,
				  bool do_notify_user)
{
	struct scic_sds_controller *scic = scic_sds_port_get_controller(sci_port);
	struct isci_port *iport = sci_port_to_iport(sci_port);
	struct isci_host *ihost = scic_to_ihost(scic);
	struct isci_phy *iphy = sci_phy_to_iphy(sci_phy);

	sci_port->active_phy_mask &= ~(1 << sci_phy->phy_index);

	sci_phy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;

	/* Re-assign the phy back to the LP as if it were a narrow port */
	writel(sci_phy->phy_index,
		&sci_port->port_pe_configuration_register[sci_phy->phy_index]);

	if (do_notify_user == true)
		isci_port_link_down(ihost, iphy, iport);
}

/**
 *
 * @sci_port: This is the port on which the phy should be disabled.
 * @sci_phy: This is the specific phy which to disabled.
 *
 * This function will disable the phy and report that the phy is not valid for
 * this port object. None
 */
static void scic_sds_port_invalid_link_up(struct scic_sds_port *sci_port,
					  struct scic_sds_phy *sci_phy)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;

	/*
	 * Check to see if we have alreay reported this link as bad and if
	 * not go ahead and tell the SCI_USER that we have discovered an
	 * invalid link.
	 */
	if ((scic->invalid_phy_mask & (1 << sci_phy->phy_index)) == 0) {
		scic_sds_controller_set_invalid_phy(scic, sci_phy);
		dev_warn(&scic_to_ihost(scic)->pdev->dev, "Invalid link up!\n");
	}
}

/**
 * scic_sds_port_general_link_up_handler - phy can be assigned to port?
 * @sci_port: scic_sds_port object for which has a phy that has gone link up.
 * @sci_phy: This is the struct scic_sds_phy object that has gone link up.
 * @do_notify_user: This parameter specifies whether to inform the user (via
 *    scic_cb_port_link_up()) as to the fact that a new phy as become ready.
 *
 * Determine if this phy can be assigned to this
 * port . If the phy is not a valid PHY for
 * this port then the function will notify the user. A PHY can only be
 * part of a port if it's attached SAS ADDRESS is the same as all other PHYs in
 * the same port. none
 */
static void scic_sds_port_general_link_up_handler(struct scic_sds_port *sci_port,
						  struct scic_sds_phy *sci_phy,
						  bool do_notify_user)
{
	struct sci_sas_address port_sas_address;
	struct sci_sas_address phy_sas_address;

	scic_sds_port_get_attached_sas_address(sci_port, &port_sas_address);
	scic_sds_phy_get_attached_sas_address(sci_phy, &phy_sas_address);

	/* If the SAS address of the new phy matches the SAS address of
	 * other phys in the port OR this is the first phy in the port,
	 * then activate the phy and allow it to be used for operations
	 * in this port.
	 */
	if ((phy_sas_address.high == port_sas_address.high &&
	     phy_sas_address.low  == port_sas_address.low) ||
	    sci_port->active_phy_mask == 0) {
		struct sci_base_state_machine *sm = &sci_port->state_machine;

		scic_sds_port_activate_phy(sci_port, sci_phy, do_notify_user);
		if (sm->current_state_id == SCI_BASE_PORT_STATE_RESETTING)
			sci_base_state_machine_change_state(sm, SCI_BASE_PORT_STATE_READY);
	} else
		scic_sds_port_invalid_link_up(sci_port, sci_phy);
}


/**
 * This method returns false if the port only has a single phy object assigned.
 *     If there are no phys or more than one phy then the method will return
 *    true.
 * @sci_port: The port for which the wide port condition is to be checked.
 *
 * bool true Is returned if this is a wide ported port. false Is returned if
 * this is a narrow port.
 */
static bool scic_sds_port_is_wide(struct scic_sds_port *sci_port)
{
	u32 index;
	u32 phy_count = 0;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->phy_table[index] != NULL) {
			phy_count++;
		}
	}

	return phy_count != 1;
}

/**
 * This method is called by the PHY object when the link is detected. if the
 *    port wants the PHY to continue on to the link up state then the port
 *    layer must return true.  If the port object returns false the phy object
 *    must halt its attempt to go link up.
 * @sci_port: The port associated with the phy object.
 * @sci_phy: The phy object that is trying to go link up.
 *
 * true if the phy object can continue to the link up condition. true Is
 * returned if this phy can continue to the ready state. false Is returned if
 * can not continue on to the ready state. This notification is in place for
 * wide ports and direct attached phys.  Since there are no wide ported SATA
 * devices this could become an invalid port configuration.
 */
bool scic_sds_port_link_detected(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	if ((sci_port->logical_port_index != SCIC_SDS_DUMMY_PORT) &&
	    (sci_phy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) &&
	    scic_sds_port_is_wide(sci_port)) {
		scic_sds_port_invalid_link_up(sci_port, sci_phy);

		return false;
	}

	return true;
}

/**
 * This method is the entry point for the phy to inform the port that it is now
 *    in a ready state
 * @sci_port:
 *
 *
 */
void scic_sds_port_link_up(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	sci_phy->is_in_link_training = false;

	sci_port->state_handlers->link_up_handler(sci_port, sci_phy);
}

/**
 * This method is the entry point for the phy to inform the port that it is no
 *    longer in a ready state
 * @sci_port:
 *
 *
 */
void scic_sds_port_link_down(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	sci_port->state_handlers->link_down_handler(sci_port, sci_phy);
}

/**
 * This method is called to start an IO request on this port.
 * @sci_port:
 * @sci_dev:
 * @sci_req:
 *
 * enum sci_status
 */
enum sci_status scic_sds_port_start_io(
	struct scic_sds_port *sci_port,
	struct scic_sds_remote_device *sci_dev,
	struct scic_sds_request *sci_req)
{
	return sci_port->state_handlers->start_io_handler(
		       sci_port, sci_dev, sci_req);
}

/**
 * This method is called to complete an IO request to the port.
 * @sci_port:
 * @sci_dev:
 * @sci_req:
 *
 * enum sci_status
 */
enum sci_status scic_sds_port_complete_io(
	struct scic_sds_port *sci_port,
	struct scic_sds_remote_device *sci_dev,
	struct scic_sds_request *sci_req)
{
	return sci_port->state_handlers->complete_io_handler(
		       sci_port, sci_dev, sci_req);
}

/**
 * This method is provided to timeout requests for port operations. Mostly its
 *    for the port reset operation.
 *
 *
 */
static void scic_sds_port_timeout_handler(void *port)
{
	struct scic_sds_port *sci_port = port;
	u32 current_state;

	current_state = sci_base_state_machine_get_state(
		&sci_port->state_machine);

	if (current_state == SCI_BASE_PORT_STATE_RESETTING) {
		/*
		 * if the port is still in the resetting state then the
		 * timeout fired before the reset completed.
		 */
		sci_base_state_machine_change_state(
			&sci_port->state_machine,
			SCI_BASE_PORT_STATE_FAILED);
	} else if (current_state == SCI_BASE_PORT_STATE_STOPPED) {
		/*
		 * if the port is stopped then the start request failed
		 * In this case stay in the stopped state.
		 */
		dev_err(sciport_to_dev(sci_port),
			"%s: SCIC Port 0x%p failed to stop before tiemout.\n",
			__func__,
			sci_port);
	} else if (current_state == SCI_BASE_PORT_STATE_STOPPING) {
		/*
		 * if the port is still stopping then the stop has not
		 * completed
		 */
		isci_port_stop_complete(
				scic_sds_port_get_controller(sci_port),
				sci_port,
				SCI_FAILURE_TIMEOUT);
	} else {
		/*
		 * The port is in the ready state and we have a timer
		 * reporting a timeout this should not happen.
		 */
		dev_err(sciport_to_dev(sci_port),
			"%s: SCIC Port 0x%p is processing a timeout operation "
			"in state %d.\n",
			__func__,
			sci_port,
			current_state);
	}
}

/* --------------------------------------------------------------------------- */

/**
 * This function updates the hardwares VIIT entry for this port.
 *
 *
 */
static void scic_sds_port_update_viit_entry(struct scic_sds_port *sci_port)
{
	struct sci_sas_address sas_address;

	scic_sds_port_get_sas_address(sci_port, &sas_address);

	writel(sas_address.high,
		&sci_port->viit_registers->initiator_sas_address_hi);
	writel(sas_address.low,
		&sci_port->viit_registers->initiator_sas_address_lo);

	/* This value get cleared just in case its not already cleared */
	writel(0, &sci_port->viit_registers->reserved);

	/* We are required to update the status register last */
	writel(SCU_VIIT_ENTRY_ID_VIIT |
	       SCU_VIIT_IPPT_INITIATOR |
	       ((1 << sci_port->physical_port_index) << SCU_VIIT_ENTRY_LPVIE_SHIFT) |
	       SCU_VIIT_STATUS_ALL_VALID,
	       &sci_port->viit_registers->status);
}

/**
 * This method returns the maximum allowed speed for data transfers on this
 *    port.  This maximum allowed speed evaluates to the maximum speed of the
 *    slowest phy in the port.
 * @sci_port: This parameter specifies the port for which to retrieve the
 *    maximum allowed speed.
 *
 * This method returns the maximum negotiated speed of the slowest phy in the
 * port.
 */
enum sas_linkrate scic_sds_port_get_max_allowed_speed(
	struct scic_sds_port *sci_port)
{
	u16 index;
	enum sas_linkrate max_allowed_speed = SAS_LINK_RATE_6_0_GBPS;
	struct scic_sds_phy *phy = NULL;

	/*
	 * Loop through all of the phys in this port and find the phy with the
	 * lowest maximum link rate. */
	for (index = 0; index < SCI_MAX_PHYS; index++) {
		phy = sci_port->phy_table[index];
		if (
			(phy != NULL)
			&& (scic_sds_port_active_phy(sci_port, phy) == true)
			&& (phy->max_negotiated_speed < max_allowed_speed)
			)
			max_allowed_speed = phy->max_negotiated_speed;
	}

	return max_allowed_speed;
}


/**
 * This method passes the event to core user.
 * @sci_port: The port that a BCN happens.
 * @sci_phy: The phy that receives BCN.
 *
 */
void scic_sds_port_broadcast_change_received(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);

	/* notify the user. */
	isci_port_bc_change_received(ihost, sci_port, sci_phy);
}


/**
 * This API methhod enables the broadcast change notification from underneath
 *    hardware.
 * @sci_port: The port that a BCN had been disabled from.
 *
 */
void scic_port_enable_broadcast_change_notification(
	struct scic_sds_port *port)
{
	struct scic_sds_phy *phy;
	u32 register_value;
	u8 index;

	/* Loop through all of the phys to enable BCN. */
	for (index = 0; index < SCI_MAX_PHYS; index++) {
		phy = port->phy_table[index];
		if (phy != NULL) {
			register_value =
				readl(&phy->link_layer_registers->link_layer_control);

			/* clear the bit by writing 1. */
			writel(register_value,
				&phy->link_layer_registers->link_layer_control);
		}
	}
}

/*
 * ****************************************************************************
 * *  READY SUBSTATE HANDLERS
 * **************************************************************************** */

/*
 * This method is the general ready state stop handler for the struct scic_sds_port
 * object.  This function will transition the ready substate machine to its
 * final state. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_ready_substate_stop_handler(
	struct scic_sds_port *port)
{
	sci_base_state_machine_change_state(
		&port->state_machine,
		SCI_BASE_PORT_STATE_STOPPING
		);

	return SCI_SUCCESS;
}

/*
 * This method is the general ready substate complete io handler for the
 * struct scic_sds_port object.  This function decrments the outstanding request count
 * for this port object. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_ready_substate_complete_io_handler(
	struct scic_sds_port *port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	scic_sds_port_decrement_request_count(port);

	return SCI_SUCCESS;
}

static enum sci_status scic_sds_port_ready_substate_add_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	enum sci_status status;

	status = scic_sds_port_set_phy(port, phy);

	if (status == SCI_SUCCESS) {
		scic_sds_port_general_link_up_handler(port, phy, true);

		port->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;

		sci_base_state_machine_change_state(
			&port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING
			);
	}

	return status;
}


static enum sci_status scic_sds_port_ready_substate_remove_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	enum sci_status status;

	status = scic_sds_port_clear_phy(port, phy);

	if (status == SCI_SUCCESS) {
		scic_sds_port_deactivate_phy(port, phy, true);

		port->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;

		sci_base_state_machine_change_state(
			&port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING
			);
	}

	return status;
}

/*
 * ****************************************************************************
 * *  READY SUBSTATE WAITING HANDLERS
 * **************************************************************************** */

/**
 *
 * @sci_port: This is the struct scic_sds_port object that which has a phy that has
 *    gone link up.
 * @sci_phy: This is the struct scic_sds_phy object that has gone link up.
 *
 * This method is the ready waiting substate link up handler for the
 * struct scic_sds_port object.  This methos will report the link up condition for
 * this port and will transition to the ready operational substate. none
 */
static void scic_sds_port_ready_waiting_substate_link_up_handler(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	/*
	 * Since this is the first phy going link up for the port we can just enable
	 * it and continue. */
	scic_sds_port_activate_phy(sci_port, sci_phy, true);

	sci_base_state_machine_change_state(
		&sci_port->ready_substate_machine,
		SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL
		);
}

/*
 * This method is the ready waiting substate start io handler for the
 * struct scic_sds_port object. The port object can not accept new requests so the
 * request is failed. enum sci_status SCI_FAILURE_INVALID_STATE
 */
static enum sci_status scic_sds_port_ready_waiting_substate_start_io_handler(
	struct scic_sds_port *port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	return SCI_FAILURE_INVALID_STATE;
}

/*
 * ****************************************************************************
 * *  READY SUBSTATE OPERATIONAL HANDLERS
 * **************************************************************************** */

/*
 * This method will casue the port to reset. enum sci_status SCI_SUCCESS
 */
static enum
sci_status scic_sds_port_ready_operational_substate_reset_handler(
		struct scic_sds_port *port,
		u32 timeout)
{
	enum sci_status status = SCI_FAILURE_INVALID_PHY;
	u32 phy_index;
	struct scic_sds_phy *selected_phy = NULL;


	/* Select a phy on which we can send the hard reset request. */
	for (phy_index = 0;
	     (phy_index < SCI_MAX_PHYS) && (selected_phy == NULL);
	     phy_index++) {
		selected_phy = port->phy_table[phy_index];

		if ((selected_phy != NULL) &&
		    !scic_sds_port_active_phy(port, selected_phy)) {
			/*
			 * We found a phy but it is not ready select
			 * different phy
			 */
			selected_phy = NULL;
		}
	}

	/* If we have a phy then go ahead and start the reset procedure */
	if (selected_phy != NULL) {
		status = scic_sds_phy_reset(selected_phy);

		if (status == SCI_SUCCESS) {
			isci_timer_start(port->timer_handle, timeout);
			port->not_ready_reason =
				SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED;

			sci_base_state_machine_change_state(
					&port->state_machine,
					SCI_BASE_PORT_STATE_RESETTING);
		}
	}

	return status;
}

/**
 * scic_sds_port_ready_operational_substate_link_up_handler() -
 * @sci_port: This is the struct scic_sds_port object that which has a phy that has
 *    gone link up.
 * @sci_phy: This is the struct scic_sds_phy object that has gone link up.
 *
 * This method is the ready operational substate link up handler for the
 * struct scic_sds_port object. This function notifies the SCI User that the phy has
 * gone link up. none
 */
static void scic_sds_port_ready_operational_substate_link_up_handler(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	scic_sds_port_general_link_up_handler(sci_port, sci_phy, true);
}

/**
 * scic_sds_port_ready_operational_substate_link_down_handler() -
 * @sci_port: This is the struct scic_sds_port object that which has a phy that has
 *    gone link down.
 * @sci_phy: This is the struct scic_sds_phy object that has gone link down.
 *
 * This method is the ready operational substate link down handler for the
 * struct scic_sds_port object. This function notifies the SCI User that the phy has
 * gone link down and if this is the last phy in the port the port will change
 * state to the ready waiting substate. none
 */
static void scic_sds_port_ready_operational_substate_link_down_handler(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy)
{
	scic_sds_port_deactivate_phy(sci_port, sci_phy, true);

	/*
	 * If there are no active phys left in the port, then transition
	 * the port to the WAITING state until such time as a phy goes
	 * link up. */
	if (sci_port->active_phy_mask == 0)
		sci_base_state_machine_change_state(&sci_port->ready_substate_machine,
						    SCIC_SDS_PORT_READY_SUBSTATE_WAITING);
}

/*
 * This method is the ready operational substate start io handler for the
 * struct scic_sds_port object.  This function incremetns the outstanding request
 * count for this port object. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_ready_operational_substate_start_io_handler(
	struct scic_sds_port *port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	port->started_request_count++;
	return SCI_SUCCESS;
}

/*
 * ****************************************************************************
 * *  READY SUBSTATE OPERATIONAL HANDLERS
 * **************************************************************************** */

/*
 * This is the default method for a port add phy request.  It will report a
 * warning and exit. enum sci_status SCI_FAILURE_INVALID_STATE
 */
static enum sci_status scic_sds_port_ready_configuring_substate_add_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	enum sci_status status;

	status = scic_sds_port_set_phy(port, phy);

	if (status == SCI_SUCCESS) {
		scic_sds_port_general_link_up_handler(port, phy, true);

		/*
		 * Re-enter the configuring state since this may be the last phy in
		 * the port. */
		sci_base_state_machine_change_state(
			&port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING
			);
	}

	return status;
}

/*
 * This is the default method for a port remove phy request.  It will report a
 * warning and exit. enum sci_status SCI_FAILURE_INVALID_STATE
 */
static enum sci_status scic_sds_port_ready_configuring_substate_remove_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	enum sci_status status;

	status = scic_sds_port_clear_phy(port, phy);

	if (status == SCI_SUCCESS) {
		scic_sds_port_deactivate_phy(port, phy, true);

		/*
		 * Re-enter the configuring state since this may be the last phy in
		 * the port. */
		sci_base_state_machine_change_state(
			&port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING
			);
	}

	return status;
}

/**
 * scic_sds_port_ready_configuring_substate_complete_io_handler() -
 * @port: This is the port that is being requested to complete the io request.
 * @device: This is the device on which the io is completing.
 *
 * This method will decrement the outstanding request count for this port. If
 * the request count goes to 0 then the port can be reprogrammed with its new
 * phy data.
 */
static enum sci_status
scic_sds_port_ready_configuring_substate_complete_io_handler(
	struct scic_sds_port *port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	scic_sds_port_decrement_request_count(port);

	if (port->started_request_count == 0) {
		sci_base_state_machine_change_state(
			&port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL
			);
	}

	return SCI_SUCCESS;
}

static enum sci_status default_port_handler(struct scic_sds_port *sci_port,
					    const char *func)
{
	dev_warn(sciport_to_dev(sci_port),
		 "%s: in wrong state: %d\n", func,
		 sci_base_state_machine_get_state(&sci_port->state_machine));
	return SCI_FAILURE_INVALID_STATE;
}

static enum sci_status
scic_sds_port_default_start_handler(struct scic_sds_port *sci_port)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status
scic_sds_port_default_stop_handler(struct scic_sds_port *sci_port)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status
scic_sds_port_default_destruct_handler(struct scic_sds_port *sci_port)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status
scic_sds_port_default_reset_handler(struct scic_sds_port *sci_port,
				    u32 timeout)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status
scic_sds_port_default_add_phy_handler(struct scic_sds_port *sci_port,
				      struct scic_sds_phy *base_phy)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status
scic_sds_port_default_remove_phy_handler(struct scic_sds_port *sci_port,
					 struct scic_sds_phy *base_phy)
{
	return default_port_handler(sci_port, __func__);
}

/*
 * This is the default method for a port unsolicited frame request.  It will
 * report a warning and exit. enum sci_status SCI_FAILURE_INVALID_STATE Is it even
 * possible to receive an unsolicited frame directed to a port object?  It
 * seems possible if we implementing virtual functions but until then?
 */
static enum sci_status
scic_sds_port_default_frame_handler(struct scic_sds_port *sci_port,
				    u32 frame_index)
{
	struct scic_sds_controller *scic = scic_sds_port_get_controller(sci_port);

	default_port_handler(sci_port, __func__);
	scic_sds_controller_release_frame(scic, frame_index);

	return SCI_FAILURE_INVALID_STATE;
}

static enum sci_status scic_sds_port_default_event_handler(struct scic_sds_port *sci_port,
						    u32 event_code)
{
	return default_port_handler(sci_port, __func__);
}

static void scic_sds_port_default_link_up_handler(struct scic_sds_port *sci_port,
					   struct scic_sds_phy *sci_phy)
{
	default_port_handler(sci_port, __func__);
}

static void scic_sds_port_default_link_down_handler(struct scic_sds_port *sci_port,
					     struct scic_sds_phy *sci_phy)
{
	default_port_handler(sci_port, __func__);
}

static enum sci_status scic_sds_port_default_start_io_handler(struct scic_sds_port *sci_port,
						       struct scic_sds_remote_device *sci_dev,
						       struct scic_sds_request *sci_req)
{
	return default_port_handler(sci_port, __func__);
}

static enum sci_status scic_sds_port_default_complete_io_handler(struct scic_sds_port *sci_port,
								 struct scic_sds_remote_device *sci_dev,
								 struct scic_sds_request *sci_req)
{
	return default_port_handler(sci_port, __func__);
}


static struct scic_sds_port_state_handler
scic_sds_port_ready_substate_handler_table[SCIC_SDS_PORT_READY_MAX_SUBSTATES] = {
	{
		/* SCIC_SDS_PORT_READY_SUBSTATE_WAITING */
		scic_sds_port_default_start_handler,
		scic_sds_port_ready_substate_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_ready_substate_add_phy_handler,
		scic_sds_port_default_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_ready_waiting_substate_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_ready_waiting_substate_start_io_handler,
		scic_sds_port_ready_substate_complete_io_handler,
	},

	{
		/* SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL */
		scic_sds_port_default_start_handler,
		scic_sds_port_ready_substate_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_ready_operational_substate_reset_handler,
		scic_sds_port_ready_substate_add_phy_handler,
		scic_sds_port_ready_substate_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_ready_operational_substate_link_up_handler,
		scic_sds_port_ready_operational_substate_link_down_handler,
		scic_sds_port_ready_operational_substate_start_io_handler,
		scic_sds_port_ready_substate_complete_io_handler,
	},

	{
		/* SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING */
		scic_sds_port_default_start_handler,
		scic_sds_port_ready_substate_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_ready_configuring_substate_add_phy_handler,
		scic_sds_port_ready_configuring_substate_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_default_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_ready_configuring_substate_complete_io_handler
	}
};

/**
 * scic_sds_port_set_ready_state_handlers() -
 *
 * This macro sets the port ready substate handlers.
 */
#define scic_sds_port_set_ready_state_handlers(port, state_id) \
	scic_sds_port_set_state_handlers(\
		port, &scic_sds_port_ready_substate_handler_table[(state_id)] \
		)

/*
 * ******************************************************************************
 * *  PORT STATE PRIVATE METHODS
 * ****************************************************************************** */

/**
 *
 * @sci_port: This is the struct scic_sds_port object to suspend.
 *
 * This method will susped the port task scheduler for this port object. none
 */
static void
scic_sds_port_suspend_port_task_scheduler(struct scic_sds_port *port)
{
	u32 pts_control_value;

	pts_control_value = readl(&port->port_task_scheduler_registers->control);
	pts_control_value |= SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &port->port_task_scheduler_registers->control);
}

/**
 * scic_sds_port_post_dummy_request() - post dummy/workaround request
 * @sci_port: port to post task
 *
 * Prevent the hardware scheduler from posting new requests to the front
 * of the scheduler queue causing a starvation problem for currently
 * ongoing requests.
 *
 */
static void scic_sds_port_post_dummy_request(struct scic_sds_port *sci_port)
{
	u32 command;
	struct scu_task_context *task_context;
	struct scic_sds_controller *scic = sci_port->owning_controller;
	u16 tci = sci_port->reserved_tci;

	task_context = scic_sds_controller_get_task_context_buffer(scic, tci);

	task_context->abort = 0;

	command = SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
		  sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
		  tci;

	scic_sds_controller_post_request(scic, command);
}

/**
 * This routine will abort the dummy request.  This will alow the hardware to
 * power down parts of the silicon to save power.
 *
 * @sci_port: The port on which the task must be aborted.
 *
 */
static void scic_sds_port_abort_dummy_request(struct scic_sds_port *sci_port)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	u16 tci = sci_port->reserved_tci;
	struct scu_task_context *tc;
	u32 command;

	tc = scic_sds_controller_get_task_context_buffer(scic, tci);

	tc->abort = 1;

	command = SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT |
		  sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
		  tci;

	scic_sds_controller_post_request(scic, command);
}

/**
 *
 * @sci_port: This is the struct scic_sds_port object to resume.
 *
 * This method will resume the port task scheduler for this port object. none
 */
static void
scic_sds_port_resume_port_task_scheduler(struct scic_sds_port *port)
{
	u32 pts_control_value;

	pts_control_value = readl(&port->port_task_scheduler_registers->control);
	pts_control_value &= ~SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &port->port_task_scheduler_registers->control);
}

/*
 * ******************************************************************************
 * *  PORT READY SUBSTATE METHODS
 * ****************************************************************************** */

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * entering the SCIC_SDS_PORT_READY_SUBSTATE_WAITING. This function checks the
 * port for any ready phys.  If there is at least one phy in a ready state then
 * the port transitions to the ready operational substate. none
 */
static void scic_sds_port_ready_substate_waiting_enter(void *object)
{
	struct scic_sds_port *sci_port = object;

	scic_sds_port_set_ready_state_handlers(
		sci_port, SCIC_SDS_PORT_READY_SUBSTATE_WAITING
		);

	scic_sds_port_suspend_port_task_scheduler(sci_port);

	sci_port->not_ready_reason = SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS;

	if (sci_port->active_phy_mask != 0) {
		/* At least one of the phys on the port is ready */
		sci_base_state_machine_change_state(
			&sci_port->ready_substate_machine,
			SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL
			);
	}
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This function will perform the actions required by the struct scic_sds_port
 * on entering the SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL. This function sets
 * the state handlers for the port object, notifies the SCI User that the port
 * is ready, and resumes port operations. none
 */
static void scic_sds_port_ready_substate_operational_enter(void *object)
{
	u32 index;
	struct scic_sds_port *sci_port = object;
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);
	struct isci_port *iport = sci_port_to_iport(sci_port);

	scic_sds_port_set_ready_state_handlers(
			sci_port,
			SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL);

	isci_port_ready(ihost, iport);

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (sci_port->phy_table[index]) {
			writel(sci_port->physical_port_index,
				&sci_port->port_pe_configuration_register[
					sci_port->phy_table[index]->phy_index]);
		}
	}

	scic_sds_port_update_viit_entry(sci_port);

	scic_sds_port_resume_port_task_scheduler(sci_port);

	/*
	 * Post the dummy task for the port so the hardware can schedule
	 * io correctly
	 */
	scic_sds_port_post_dummy_request(sci_port);
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * exiting the SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL. This function reports
 * the port not ready and suspends the port task scheduler. none
 */
static void scic_sds_port_ready_substate_operational_exit(void *object)
{
	struct scic_sds_port *sci_port = object;
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);
	struct isci_port *iport = sci_port_to_iport(sci_port);

	/*
	 * Kill the dummy task for this port if it has not yet posted
	 * the hardware will treat this as a NOP and just return abort
	 * complete.
	 */
	scic_sds_port_abort_dummy_request(sci_port);

	isci_port_not_ready(ihost, iport);
}

/*
 * ******************************************************************************
 * *  PORT READY CONFIGURING METHODS
 * ****************************************************************************** */

/**
 * scic_sds_port_ready_substate_configuring_enter() -
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * exiting the SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL. This function reports
 * the port not ready and suspends the port task scheduler. none
 */
static void scic_sds_port_ready_substate_configuring_enter(void *object)
{
	struct scic_sds_port *sci_port = object;
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);
	struct isci_port *iport = sci_port_to_iport(sci_port);

	scic_sds_port_set_ready_state_handlers(
			sci_port,
			SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING);

	if (sci_port->active_phy_mask == 0) {
		isci_port_not_ready(ihost, iport);

		sci_base_state_machine_change_state(
				&sci_port->ready_substate_machine,
				SCIC_SDS_PORT_READY_SUBSTATE_WAITING);
	} else if (sci_port->started_request_count == 0)
		sci_base_state_machine_change_state(
				&sci_port->ready_substate_machine,
				SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL);
}

static void scic_sds_port_ready_substate_configuring_exit(void *object)
{
	struct scic_sds_port *sci_port = object;

	scic_sds_port_suspend_port_task_scheduler(sci_port);
}

/* --------------------------------------------------------------------------- */

static const struct sci_base_state scic_sds_port_ready_substate_table[] = {
	[SCIC_SDS_PORT_READY_SUBSTATE_WAITING] = {
		.enter_state = scic_sds_port_ready_substate_waiting_enter,
	},
	[SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL] = {
		.enter_state = scic_sds_port_ready_substate_operational_enter,
		.exit_state  = scic_sds_port_ready_substate_operational_exit
	},
	[SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING] = {
		.enter_state = scic_sds_port_ready_substate_configuring_enter,
		.exit_state  = scic_sds_port_ready_substate_configuring_exit
	},
};

/**
 *
 * @port: This is the struct scic_sds_port object on which the io request count will
 *    be decremented.
 * @device: This is the struct scic_sds_remote_device object to which the io request
 *    is being directed.  This parameter is not required to complete this
 *    operation.
 * @io_request: This is the request that is being completed on this port
 *    object.  This parameter is not required to complete this operation.
 *
 * This is a general complete io request handler for the struct scic_sds_port object.
 * enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_general_complete_io_handler(
	struct scic_sds_port *port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	scic_sds_port_decrement_request_count(port);

	return SCI_SUCCESS;
}

/**
 * scic_sds_port_stopped_state_start_handler() - stop a port from "started"
 *
 * @port: This is the struct scic_sds_port object which is cast into a
 * struct scic_sds_port object.
 *
 * This function takes the struct scic_sds_port from a stopped state and
 * attempts to start it.  To start a port it must have no assiged devices and
 * it must have at least one phy assigned to it.  If those conditions are
 * met then the port can transition to the ready state.
 * enum sci_status
 * SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION
 * This struct scic_sds_port object could not be started because the port
 * configuration is not valid.
 * SCI_SUCCESS
 * the start request is successful and the struct scic_sds_port object
 * has transitioned to the SCI_BASE_PORT_STATE_READY.
 */
static enum sci_status
scic_sds_port_stopped_state_start_handler(struct scic_sds_port *sci_port)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);
	enum sci_status status = SCI_SUCCESS;
	u32 phy_mask;

	if (sci_port->assigned_device_count > 0) {
		/*
		 * @todo This is a start failure operation because
		 * there are still devices assigned to this port.
		 * There must be no devices assigned to a port on a
		 * start operation.
		 */
		return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
	}

	sci_port->timer_handle =
		isci_timer_create(ihost,
				  sci_port,
				  scic_sds_port_timeout_handler);

	if (!sci_port->timer_handle)
		return SCI_FAILURE_INSUFFICIENT_RESOURCES;

	if (sci_port->reserved_rni == SCU_DUMMY_INDEX) {
		u16 rni = scic_sds_remote_node_table_allocate_remote_node(
				&scic->available_remote_nodes, 1);

		if (rni != SCU_DUMMY_INDEX)
			scic_sds_port_construct_dummy_rnc(sci_port, rni);
		else
			status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
		sci_port->reserved_rni = rni;
	}

	if (sci_port->reserved_tci == SCU_DUMMY_INDEX) {
		/* Allocate a TCI and remove the sequence nibble */
		u16 tci = scic_controller_allocate_io_tag(scic);

		if (tci != SCU_DUMMY_INDEX)
			scic_sds_port_construct_dummy_task(sci_port, tci);
		else
			status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
		sci_port->reserved_tci = tci;
	}

	if (status == SCI_SUCCESS) {
		phy_mask = scic_sds_port_get_phys(sci_port);

		/*
		 * There are one or more phys assigned to this port.  Make sure
		 * the port's phy mask is in fact legal and supported by the
		 * silicon.
		 */
		if (scic_sds_port_is_phy_mask_valid(sci_port, phy_mask) == true) {
			sci_base_state_machine_change_state(
				&sci_port->state_machine,
				SCI_BASE_PORT_STATE_READY);

			return SCI_SUCCESS;
		} else
			status = SCI_FAILURE;
	}

	if (status != SCI_SUCCESS)
		scic_sds_port_destroy_dummy_resources(sci_port);

	return status;
}

/*
 * This method takes the struct scic_sds_port that is in a stopped state and handles a
 * stop request.  This function takes no action. enum sci_status SCI_SUCCESS the
 * stop request is successful as the struct scic_sds_port object is already stopped.
 */
static enum sci_status scic_sds_port_stopped_state_stop_handler(
	struct scic_sds_port *port)
{
	/* We are already stopped so there is nothing to do here */
	return SCI_SUCCESS;
}

/*
 * This method takes the struct scic_sds_port that is in a stopped state and handles
 * the destruct request.  The stopped state is the only state in which the
 * struct scic_sds_port can be destroyed.  This function causes the port object to
 * transition to the SCI_BASE_PORT_STATE_FINAL. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_stopped_state_destruct_handler(
	struct scic_sds_port *port)
{
	sci_base_state_machine_stop(&port->state_machine);

	return SCI_SUCCESS;
}

/*
 * This method takes the struct scic_sds_port that is in a stopped state and handles
 * the add phy request.  In MPC mode the only time a phy can be added to a port
 * is in the SCI_BASE_PORT_STATE_STOPPED. enum sci_status
 * SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION is returned when the phy can not
 * be added to the port. SCI_SUCCESS if the phy is added to the port.
 */
static enum sci_status scic_sds_port_stopped_state_add_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	struct sci_sas_address port_sas_address;

	/* Read the port assigned SAS Address if there is one */
	scic_sds_port_get_sas_address(port, &port_sas_address);

	if (port_sas_address.high != 0 && port_sas_address.low != 0) {
		struct sci_sas_address phy_sas_address;

		/*
		 * Make sure that the PHY SAS Address matches the SAS Address
		 * for this port. */
		scic_sds_phy_get_sas_address(phy, &phy_sas_address);

		if (
			(port_sas_address.high != phy_sas_address.high)
			|| (port_sas_address.low  != phy_sas_address.low)
			) {
			return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
		}
	}

	return scic_sds_port_set_phy(port, phy);
}

/*
 * This method takes the struct scic_sds_port that is in a stopped state and handles
 * the remove phy request.  In MPC mode the only time a phy can be removed from
 * a port is in the SCI_BASE_PORT_STATE_STOPPED. enum sci_status
 * SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION is returned when the phy can not
 * be added to the port. SCI_SUCCESS if the phy is added to the port.
 */
static enum sci_status scic_sds_port_stopped_state_remove_phy_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	return scic_sds_port_clear_phy(port, phy);
}

/*
 * ****************************************************************************
 * *  READY STATE HANDLERS
 * **************************************************************************** */

/*
 * ****************************************************************************
 * *  RESETTING STATE HANDLERS
 * **************************************************************************** */

/*
 * ****************************************************************************
 * *  STOPPING STATE HANDLERS
 * **************************************************************************** */

/*
 * This method takes the struct scic_sds_port that is in a stopping state and handles
 * the complete io request. Should the request count reach 0 then the port
 * object will transition to the stopped state. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_stopping_state_complete_io_handler(
	struct scic_sds_port *sci_port,
	struct scic_sds_remote_device *device,
	struct scic_sds_request *io_request)
{
	scic_sds_port_decrement_request_count(sci_port);

	if (sci_port->started_request_count == 0) {
		sci_base_state_machine_change_state(&sci_port->state_machine,
						    SCI_BASE_PORT_STATE_STOPPED);
	}

	return SCI_SUCCESS;
}

/*
 * ****************************************************************************
 * *  RESETTING STATE HANDLERS
 * **************************************************************************** */

/**
 *
 * @port: This is the port object which is being requested to stop.
 *
 * This method will stop a failed port.  This causes a transition to the
 * stopping state. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_port_reset_state_stop_handler(
	struct scic_sds_port *port)
{
	sci_base_state_machine_change_state(
		&port->state_machine,
		SCI_BASE_PORT_STATE_STOPPING
		);

	return SCI_SUCCESS;
}

/*
 * This method will transition a failed port to its ready state.  The port
 * failed because a hard reset request timed out but at some time later one or
 * more phys in the port became ready. enum sci_status SCI_SUCCESS
 */
static void scic_sds_port_reset_state_link_up_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	/*
	 * / @todo We should make sure that the phy that has gone link up is the same
	 * /       one on which we sent the reset.  It is possible that the phy on
	 * /       which we sent the reset is not the one that has gone link up and we
	 * /       want to make sure that phy being reset comes back.  Consider the
	 * /       case where a reset is sent but before the hardware processes the
	 * /       reset it get a link up on the port because of a hot plug event.
	 * /       because of the reset request this phy will go link down almost
	 * /       immediately. */

	/*
	 * In the resetting state we don't notify the user regarding
	 * link up and link down notifications. */
	scic_sds_port_general_link_up_handler(port, phy, false);
}

/*
 * This method process link down notifications that occur during a port reset
 * operation. Link downs can occur during the reset operation. enum sci_status
 * SCI_SUCCESS
 */
static void scic_sds_port_reset_state_link_down_handler(
	struct scic_sds_port *port,
	struct scic_sds_phy *phy)
{
	/*
	 * In the resetting state we don't notify the user regarding
	 * link up and link down notifications. */
	scic_sds_port_deactivate_phy(port, phy, false);
}

static struct scic_sds_port_state_handler
scic_sds_port_state_handler_table[SCI_BASE_PORT_MAX_STATES] =
{
	/* SCI_BASE_PORT_STATE_STOPPED */
	{
		scic_sds_port_stopped_state_start_handler,
		scic_sds_port_stopped_state_stop_handler,
		scic_sds_port_stopped_state_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_stopped_state_add_phy_handler,
		scic_sds_port_stopped_state_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_default_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_default_complete_io_handler
	},
	/* SCI_BASE_PORT_STATE_STOPPING */
	{
		scic_sds_port_default_start_handler,
		scic_sds_port_default_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_default_add_phy_handler,
		scic_sds_port_default_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_default_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_stopping_state_complete_io_handler
	},
	/* SCI_BASE_PORT_STATE_READY */
	{
		scic_sds_port_default_start_handler,
		scic_sds_port_default_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_default_add_phy_handler,
		scic_sds_port_default_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_default_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_general_complete_io_handler
	},
	/* SCI_BASE_PORT_STATE_RESETTING */
	{
		scic_sds_port_default_start_handler,
		scic_sds_port_reset_state_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_default_add_phy_handler,
		scic_sds_port_default_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_reset_state_link_up_handler,
		scic_sds_port_reset_state_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_general_complete_io_handler
	},
	/* SCI_BASE_PORT_STATE_FAILED */
	{
		scic_sds_port_default_start_handler,
		scic_sds_port_default_stop_handler,
		scic_sds_port_default_destruct_handler,
		scic_sds_port_default_reset_handler,
		scic_sds_port_default_add_phy_handler,
		scic_sds_port_default_remove_phy_handler,
		scic_sds_port_default_frame_handler,
		scic_sds_port_default_event_handler,
		scic_sds_port_default_link_up_handler,
		scic_sds_port_default_link_down_handler,
		scic_sds_port_default_start_io_handler,
		scic_sds_port_general_complete_io_handler
	}
};

/*
 * ******************************************************************************
 * *  PORT STATE PRIVATE METHODS
 * ****************************************************************************** */

/**
 *
 * @sci_port: This is the port object which to suspend.
 *
 * This method will enable the SCU Port Task Scheduler for this port object but
 * will leave the port task scheduler in a suspended state. none
 */
static void
scic_sds_port_enable_port_task_scheduler(struct scic_sds_port *port)
{
	u32 pts_control_value;

	pts_control_value = readl(&port->port_task_scheduler_registers->control);
	pts_control_value |= SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &port->port_task_scheduler_registers->control);
}

/**
 *
 * @sci_port: This is the port object which to resume.
 *
 * This method will disable the SCU port task scheduler for this port object.
 * none
 */
static void
scic_sds_port_disable_port_task_scheduler(struct scic_sds_port *port)
{
	u32 pts_control_value;

	pts_control_value = readl(&port->port_task_scheduler_registers->control);
	pts_control_value &=
		~(SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND));
	writel(pts_control_value, &port->port_task_scheduler_registers->control);
}

static void scic_sds_port_post_dummy_remote_node(struct scic_sds_port *sci_port)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	u8 phys_index = sci_port->physical_port_index;
	union scu_remote_node_context *rnc;
	u16 rni = sci_port->reserved_rni;
	u32 command;

	rnc = &scic->remote_node_context_table[rni];
	rnc->ssp.is_valid = true;

	command = SCU_CONTEXT_COMMAND_POST_RNC_32 |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	scic_sds_controller_post_request(scic, command);

	/* ensure hardware has seen the post rnc command and give it
	 * ample time to act before sending the suspend
	 */
	readl(&scic->smu_registers->interrupt_status); /* flush */
	udelay(10);

	command = SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	scic_sds_controller_post_request(scic, command);
}

static void scic_sds_port_invalidate_dummy_remote_node(struct scic_sds_port *sci_port)
{
	struct scic_sds_controller *scic = sci_port->owning_controller;
	u8 phys_index = sci_port->physical_port_index;
	union scu_remote_node_context *rnc;
	u16 rni = sci_port->reserved_rni;
	u32 command;

	rnc = &scic->remote_node_context_table[rni];

	rnc->ssp.is_valid = false;

	/* ensure the preceding tc abort request has reached the
	 * controller and give it ample time to act before posting the rnc
	 * invalidate
	 */
	readl(&scic->smu_registers->interrupt_status); /* flush */
	udelay(10);

	command = SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	scic_sds_controller_post_request(scic, command);
}

/*
 * ******************************************************************************
 * *  PORT STATE METHODS
 * ****************************************************************************** */

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * entering the SCI_BASE_PORT_STATE_STOPPED. This function sets the stopped
 * state handlers for the struct scic_sds_port object and disables the port task
 * scheduler in the hardware. none
 */
static void scic_sds_port_stopped_state_enter(void *object)
{
	struct scic_sds_port *sci_port = object;

	scic_sds_port_set_base_state_handlers(
		sci_port, SCI_BASE_PORT_STATE_STOPPED
		);

	if (
		SCI_BASE_PORT_STATE_STOPPING
		== sci_port->state_machine.previous_state_id
		) {
		/*
		 * If we enter this state becasuse of a request to stop
		 * the port then we want to disable the hardwares port
		 * task scheduler. */
		scic_sds_port_disable_port_task_scheduler(sci_port);
	}
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * exiting the SCI_BASE_STATE_STOPPED. This function enables the SCU hardware
 * port task scheduler. none
 */
static void scic_sds_port_stopped_state_exit(void *object)
{
	struct scic_sds_port *sci_port = object;

	/* Enable and suspend the port task scheduler */
	scic_sds_port_enable_port_task_scheduler(sci_port);
}

/**
 * scic_sds_port_ready_state_enter -
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * entering the SCI_BASE_PORT_STATE_READY. This function sets the ready state
 * handlers for the struct scic_sds_port object, reports the port object as
 * not ready and starts the ready substate machine. none
 */
static void scic_sds_port_ready_state_enter(void *object)
{
	struct scic_sds_port *sci_port = object;
	struct scic_sds_controller *scic = sci_port->owning_controller;
	struct isci_host *ihost = scic_to_ihost(scic);
	struct isci_port *iport = sci_port_to_iport(sci_port);
	u32 prev_state;

	/* Put the ready state handlers in place though they will not be there long */
	scic_sds_port_set_base_state_handlers(sci_port, SCI_BASE_PORT_STATE_READY);

	prev_state = sci_port->state_machine.previous_state_id;
	if (prev_state  == SCI_BASE_PORT_STATE_RESETTING)
		isci_port_hard_reset_complete(iport, SCI_SUCCESS);
	else
		isci_port_not_ready(ihost, iport);

	/* Post and suspend the dummy remote node context for this port. */
	scic_sds_port_post_dummy_remote_node(sci_port);

	/* Start the ready substate machine */
	sci_base_state_machine_start(&sci_port->ready_substate_machine);
}

static void scic_sds_port_ready_state_exit(void *object)
{
	struct scic_sds_port *sci_port = object;

	sci_base_state_machine_stop(&sci_port->ready_substate_machine);
	scic_sds_port_invalidate_dummy_remote_node(sci_port);
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * entering the SCI_BASE_PORT_STATE_RESETTING. This function sets the resetting
 * state handlers for the struct scic_sds_port object. none
 */
static void scic_sds_port_resetting_state_enter(void *object)
{
	struct scic_sds_port *sci_port = object;

	scic_sds_port_set_base_state_handlers(
		sci_port, SCI_BASE_PORT_STATE_RESETTING
		);
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This function will perform the actions required by the
 * struct scic_sds_port on
 * exiting the SCI_BASE_STATE_RESETTING. This function does nothing. none
 */
static inline void scic_sds_port_resetting_state_exit(void *object)
{
	struct scic_sds_port *sci_port = object;

	isci_timer_stop(sci_port->timer_handle);
}

/**
 *
 * @object: This is the void object which is cast to a
 * struct scic_sds_port object.
 *
 * This method will perform the actions required by the struct scic_sds_port on
 * entering the SCI_BASE_PORT_STATE_STOPPING. This function sets the stopping
 * state handlers for the struct scic_sds_port object. none
 */
static void scic_sds_port_stopping_state_enter(void *object)
{
	struct scic_sds_port *sci_port = object;

	scic_sds_port_set_base_state_handlers(
		sci_port, SCI_BASE_PORT_STATE_STOPPING
		);
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This function will perform the actions required by the
 * struct scic_sds_port on
 * exiting the SCI_BASE_STATE_STOPPING. This function does nothing. none
 */
static inline void
scic_sds_port_stopping_state_exit(void *object)
{
	struct scic_sds_port *sci_port = object;

	isci_timer_stop(sci_port->timer_handle);

	scic_sds_port_destroy_dummy_resources(sci_port);
}

/**
 *
 * @object: This is the object which is cast to a struct scic_sds_port object.
 *
 * This function will perform the actions required by the
 * struct scic_sds_port on
 * entering the SCI_BASE_PORT_STATE_STOPPING. This function sets the stopping
 * state handlers for the struct scic_sds_port object. none
 */
static void scic_sds_port_failed_state_enter(void *object)
{
	struct scic_sds_port *sci_port = object;
	struct isci_port *iport = sci_port_to_iport(sci_port);

	scic_sds_port_set_base_state_handlers(sci_port,
					      SCI_BASE_PORT_STATE_FAILED);

	isci_port_hard_reset_complete(iport, SCI_FAILURE_TIMEOUT);
}

/* --------------------------------------------------------------------------- */

static const struct sci_base_state scic_sds_port_state_table[] = {
	[SCI_BASE_PORT_STATE_STOPPED] = {
		.enter_state = scic_sds_port_stopped_state_enter,
		.exit_state  = scic_sds_port_stopped_state_exit
	},
	[SCI_BASE_PORT_STATE_STOPPING] = {
		.enter_state = scic_sds_port_stopping_state_enter,
		.exit_state  = scic_sds_port_stopping_state_exit
	},
	[SCI_BASE_PORT_STATE_READY] = {
		.enter_state = scic_sds_port_ready_state_enter,
		.exit_state  = scic_sds_port_ready_state_exit
	},
	[SCI_BASE_PORT_STATE_RESETTING] = {
		.enter_state = scic_sds_port_resetting_state_enter,
		.exit_state  = scic_sds_port_resetting_state_exit
	},
	[SCI_BASE_PORT_STATE_FAILED] = {
		.enter_state = scic_sds_port_failed_state_enter,
	}
};

void scic_sds_port_construct(struct scic_sds_port *sci_port, u8 index,
			     struct scic_sds_controller *scic)
{
	sci_base_state_machine_construct(&sci_port->state_machine,
					 sci_port,
					 scic_sds_port_state_table,
					 SCI_BASE_PORT_STATE_STOPPED);

	sci_base_state_machine_start(&sci_port->state_machine);

	sci_base_state_machine_construct(&sci_port->ready_substate_machine,
					 sci_port,
					 scic_sds_port_ready_substate_table,
					 SCIC_SDS_PORT_READY_SUBSTATE_WAITING);

	sci_port->logical_port_index  = SCIC_SDS_DUMMY_PORT;
	sci_port->physical_port_index = index;
	sci_port->active_phy_mask     = 0;

	sci_port->owning_controller = scic;

	sci_port->started_request_count = 0;
	sci_port->assigned_device_count = 0;

	sci_port->reserved_rni = SCU_DUMMY_INDEX;
	sci_port->reserved_tci = SCU_DUMMY_INDEX;

	sci_port->timer_handle = NULL;
	sci_port->port_task_scheduler_registers = NULL;

	for (index = 0; index < SCI_MAX_PHYS; index++)
		sci_port->phy_table[index] = NULL;
}