isci: merge smp request substates into primary state machine

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / isci / host.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 <linux/device.h>
#include <scsi/sas.h>
#include "host.h"
#include "isci.h"
#include "port.h"
#include "host.h"
#include "probe_roms.h"
#include "remote_device.h"
#include "request.h"
#include "scu_completion_codes.h"
#include "scu_event_codes.h"
#include "registers.h"
#include "scu_remote_node_context.h"
#include "scu_task_context.h"
#include "scu_unsolicited_frame.h"
#include "timers.h"

#define SCU_CONTEXT_RAM_INIT_STALL_TIME      200

/**
 * smu_dcc_get_max_ports() -
 *
 * This macro returns the maximum number of logical ports supported by the
 * hardware. The caller passes in the value read from the device context
 * capacity register and this macro will mash and shift the value appropriately.
 */
#define smu_dcc_get_max_ports(dcc_value) \
        (\
                (((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_LP_MASK) \
                 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_LP_SHIFT) + 1 \
        )

/**
 * smu_dcc_get_max_task_context() -
 *
 * This macro returns the maximum number of task contexts supported by the
 * hardware. The caller passes in the value read from the device context
 * capacity register and this macro will mash and shift the value appropriately.
 */
#define smu_dcc_get_max_task_context(dcc_value) \
        (\
                (((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_TC_MASK) \
                 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_TC_SHIFT) + 1 \
        )

/**
 * smu_dcc_get_max_remote_node_context() -
 *
 * This macro returns the maximum number of remote node contexts supported by
 * the hardware. The caller passes in the value read from the device context
 * capacity register and this macro will mash and shift the value appropriately.
 */
#define smu_dcc_get_max_remote_node_context(dcc_value) \
        (\
                (((dcc_value) & SMU_DEVICE_CONTEXT_CAPACITY_MAX_RNC_MASK) \
                 >> SMU_DEVICE_CONTEXT_CAPACITY_MAX_RNC_SHIFT) + 1 \
        )


#define SCIC_SDS_CONTROLLER_MIN_TIMER_COUNT  3
#define SCIC_SDS_CONTROLLER_MAX_TIMER_COUNT  3

/**
 *
 *
 * The number of milliseconds to wait for a phy to start.
 */
#define SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT      100

/**
 *
 *
 * The number of milliseconds to wait while a given phy is consuming power
 * before allowing another set of phys to consume power. Ultimately, this will
 * be specified by OEM parameter.
 */
#define SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL 500

/**
 * NORMALIZE_PUT_POINTER() -
 *
 * This macro will normalize the completion queue put pointer so its value can
 * be used as an array inde
 */
#define NORMALIZE_PUT_POINTER(x) \
        ((x) & SMU_COMPLETION_QUEUE_PUT_POINTER_MASK)


/**
 * NORMALIZE_EVENT_POINTER() -
 *
 * This macro will normalize the completion queue event entry so its value can
 * be used as an index.
 */
#define NORMALIZE_EVENT_POINTER(x) \
        (\
                ((x) & SMU_COMPLETION_QUEUE_GET_EVENT_POINTER_MASK) \
                >> SMU_COMPLETION_QUEUE_GET_EVENT_POINTER_SHIFT \
        )

/**
 * INCREMENT_COMPLETION_QUEUE_GET() -
 *
 * This macro will increment the controllers completion queue index value and
 * possibly toggle the cycle bit if the completion queue index wraps back to 0.
 */
#define INCREMENT_COMPLETION_QUEUE_GET(controller, index, cycle) \
        INCREMENT_QUEUE_GET(\
                (index), \
                (cycle), \
                (controller)->completion_queue_entries, \
                SMU_CQGR_CYCLE_BIT \
                )

/**
 * INCREMENT_EVENT_QUEUE_GET() -
 *
 * This macro will increment the controllers event queue index value and
 * possibly toggle the event cycle bit if the event queue index wraps back to 0.
 */
#define INCREMENT_EVENT_QUEUE_GET(controller, index, cycle) \
        INCREMENT_QUEUE_GET(\
                (index), \
                (cycle), \
                (controller)->completion_event_entries, \
                SMU_CQGR_EVENT_CYCLE_BIT \
                )


/**
 * NORMALIZE_GET_POINTER() -
 *
 * This macro will normalize the completion queue get pointer so its value can
 * be used as an index into an array
 */
#define NORMALIZE_GET_POINTER(x) \
        ((x) & SMU_COMPLETION_QUEUE_GET_POINTER_MASK)

/**
 * NORMALIZE_GET_POINTER_CYCLE_BIT() -
 *
 * This macro will normalize the completion queue cycle pointer so it matches
 * the completion queue cycle bit
 */
#define NORMALIZE_GET_POINTER_CYCLE_BIT(x) \
        ((SMU_CQGR_CYCLE_BIT & (x)) << (31 - SMU_COMPLETION_QUEUE_GET_CYCLE_BIT_SHIFT))

/**
 * COMPLETION_QUEUE_CYCLE_BIT() -
 *
 * This macro will return the cycle bit of the completion queue entry
 */
#define COMPLETION_QUEUE_CYCLE_BIT(x) ((x) & 0x80000000)

static bool scic_sds_controller_completion_queue_has_entries(
        struct scic_sds_controller *scic)
{
        u32 get_value = scic->completion_queue_get;
        u32 get_index = get_value & SMU_COMPLETION_QUEUE_GET_POINTER_MASK;

        if (NORMALIZE_GET_POINTER_CYCLE_BIT(get_value) ==
            COMPLETION_QUEUE_CYCLE_BIT(scic->completion_queue[get_index]))
                return true;

        return false;
}

static bool scic_sds_controller_isr(struct scic_sds_controller *scic)
{
        if (scic_sds_controller_completion_queue_has_entries(scic)) {
                return true;
        } else {
                /*
                 * we have a spurious interrupt it could be that we have already
                 * emptied the completion queue from a previous interrupt */
                writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);

                /*
                 * There is a race in the hardware that could cause us not to be notified
                 * of an interrupt completion if we do not take this step.  We will mask
                 * then unmask the interrupts so if there is another interrupt pending
                 * the clearing of the interrupt source we get the next interrupt message. */
                writel(0xFF000000, &scic->smu_registers->interrupt_mask);
                writel(0, &scic->smu_registers->interrupt_mask);
        }

        return false;
}

irqreturn_t isci_msix_isr(int vec, void *data)
{
        struct isci_host *ihost = data;

        if (scic_sds_controller_isr(&ihost->sci))
                tasklet_schedule(&ihost->completion_tasklet);

        return IRQ_HANDLED;
}

static bool scic_sds_controller_error_isr(struct scic_sds_controller *scic)
{
        u32 interrupt_status;

        interrupt_status =
                readl(&scic->smu_registers->interrupt_status);
        interrupt_status &= (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND);

        if (interrupt_status != 0) {
                /*
                 * There is an error interrupt pending so let it through and handle
                 * in the callback */
                return true;
        }

        /*
         * There is a race in the hardware that could cause us not to be notified
         * of an interrupt completion if we do not take this step.  We will mask
         * then unmask the error interrupts so if there was another interrupt
         * pending we will be notified.
         * Could we write the value of (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND)? */
        writel(0xff, &scic->smu_registers->interrupt_mask);
        writel(0, &scic->smu_registers->interrupt_mask);

        return false;
}

static void scic_sds_controller_task_completion(struct scic_sds_controller *scic,
                                                u32 completion_entry)
{
        u32 index;
        struct scic_sds_request *io_request;

        index = SCU_GET_COMPLETION_INDEX(completion_entry);
        io_request = scic->io_request_table[index];

        /* Make sure that we really want to process this IO request */
        if (
                (io_request != NULL)
                && (io_request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG)
                && (
                        scic_sds_io_tag_get_sequence(io_request->io_tag)
                        == scic->io_request_sequence[index]
                        )
                ) {
                /* Yep this is a valid io request pass it along to the io request handler */
                scic_sds_io_request_tc_completion(io_request, completion_entry);
        }
}

static void scic_sds_controller_sdma_completion(struct scic_sds_controller *scic,
                                                u32 completion_entry)
{
        u32 index;
        struct scic_sds_request *io_request;
        struct scic_sds_remote_device *device;

        index = SCU_GET_COMPLETION_INDEX(completion_entry);

        switch (scu_get_command_request_type(completion_entry)) {
        case SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC:
        case SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_TC:
                io_request = scic->io_request_table[index];
                dev_warn(scic_to_dev(scic),
                         "%s: SCIC SDS Completion type SDMA %x for io request "
                         "%p\n",
                         __func__,
                         completion_entry,
                         io_request);
                /* @todo For a post TC operation we need to fail the IO
                 * request
                 */
                break;

        case SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_RNC:
        case SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC:
        case SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC:
                device = scic->device_table[index];
                dev_warn(scic_to_dev(scic),
                         "%s: SCIC SDS Completion type SDMA %x for remote "
                         "device %p\n",
                         __func__,
                         completion_entry,
                         device);
                /* @todo For a port RNC operation we need to fail the
                 * device
                 */
                break;

        default:
                dev_warn(scic_to_dev(scic),
                         "%s: SCIC SDS Completion unknown SDMA completion "
                         "type %x\n",
                         __func__,
                         completion_entry);
                break;

        }
}

static void scic_sds_controller_unsolicited_frame(struct scic_sds_controller *scic,
                                                  u32 completion_entry)
{
        u32 index;
        u32 frame_index;

        struct isci_host *ihost = scic_to_ihost(scic);
        struct scu_unsolicited_frame_header *frame_header;
        struct scic_sds_phy *phy;
        struct scic_sds_remote_device *device;

        enum sci_status result = SCI_FAILURE;

        frame_index = SCU_GET_FRAME_INDEX(completion_entry);

        frame_header = scic->uf_control.buffers.array[frame_index].header;
        scic->uf_control.buffers.array[frame_index].state = UNSOLICITED_FRAME_IN_USE;

        if (SCU_GET_FRAME_ERROR(completion_entry)) {
                /*
                 * / @todo If the IAF frame or SIGNATURE FIS frame has an error will
                 * /       this cause a problem? We expect the phy initialization will
                 * /       fail if there is an error in the frame. */
                scic_sds_controller_release_frame(scic, frame_index);
                return;
        }

        if (frame_header->is_address_frame) {
                index = SCU_GET_PROTOCOL_ENGINE_INDEX(completion_entry);
                phy = &ihost->phys[index].sci;
                result = scic_sds_phy_frame_handler(phy, frame_index);
        } else {

                index = SCU_GET_COMPLETION_INDEX(completion_entry);

                if (index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) {
                        /*
                         * This is a signature fis or a frame from a direct attached SATA
                         * device that has not yet been created.  In either case forwared
                         * the frame to the PE and let it take care of the frame data. */
                        index = SCU_GET_PROTOCOL_ENGINE_INDEX(completion_entry);
                        phy = &ihost->phys[index].sci;
                        result = scic_sds_phy_frame_handler(phy, frame_index);
                } else {
                        if (index < scic->remote_node_entries)
                                device = scic->device_table[index];
                        else
                                device = NULL;

                        if (device != NULL)
                                result = scic_sds_remote_device_frame_handler(device, frame_index);
                        else
                                scic_sds_controller_release_frame(scic, frame_index);
                }
        }

        if (result != SCI_SUCCESS) {
                /*
                 * / @todo Is there any reason to report some additional error message
                 * /       when we get this failure notifiction? */
        }
}

static void scic_sds_controller_event_completion(struct scic_sds_controller *scic,
                                                 u32 completion_entry)
{
        struct isci_host *ihost = scic_to_ihost(scic);
        struct scic_sds_request *io_request;
        struct scic_sds_remote_device *device;
        struct scic_sds_phy *phy;
        u32 index;

        index = SCU_GET_COMPLETION_INDEX(completion_entry);

        switch (scu_get_event_type(completion_entry)) {
        case SCU_EVENT_TYPE_SMU_COMMAND_ERROR:
                /* / @todo The driver did something wrong and we need to fix the condtion. */
                dev_err(scic_to_dev(scic),
                        "%s: SCIC Controller 0x%p received SMU command error "
                        "0x%x\n",
                        __func__,
                        scic,
                        completion_entry);
                break;

        case SCU_EVENT_TYPE_SMU_PCQ_ERROR:
        case SCU_EVENT_TYPE_SMU_ERROR:
        case SCU_EVENT_TYPE_FATAL_MEMORY_ERROR:
                /*
                 * / @todo This is a hardware failure and its likely that we want to
                 * /       reset the controller. */
                dev_err(scic_to_dev(scic),
                        "%s: SCIC Controller 0x%p received fatal controller "
                        "event  0x%x\n",
                        __func__,
                        scic,
                        completion_entry);
                break;

        case SCU_EVENT_TYPE_TRANSPORT_ERROR:
                io_request = scic->io_request_table[index];
                scic_sds_io_request_event_handler(io_request, completion_entry);
                break;

        case SCU_EVENT_TYPE_PTX_SCHEDULE_EVENT:
                switch (scu_get_event_specifier(completion_entry)) {
                case SCU_EVENT_SPECIFIC_SMP_RESPONSE_NO_PE:
                case SCU_EVENT_SPECIFIC_TASK_TIMEOUT:
                        io_request = scic->io_request_table[index];
                        if (io_request != NULL)
                                scic_sds_io_request_event_handler(io_request, completion_entry);
                        else
                                dev_warn(scic_to_dev(scic),
                                         "%s: SCIC Controller 0x%p received "
                                         "event 0x%x for io request object "
                                         "that doesnt exist.\n",
                                         __func__,
                                         scic,
                                         completion_entry);

                        break;

                case SCU_EVENT_SPECIFIC_IT_NEXUS_TIMEOUT:
                        device = scic->device_table[index];
                        if (device != NULL)
                                scic_sds_remote_device_event_handler(device, completion_entry);
                        else
                                dev_warn(scic_to_dev(scic),
                                         "%s: SCIC Controller 0x%p received "
                                         "event 0x%x for remote device object "
                                         "that doesnt exist.\n",
                                         __func__,
                                         scic,
                                         completion_entry);

                        break;
                }
                break;

        case SCU_EVENT_TYPE_BROADCAST_CHANGE:
        /*
         * direct the broadcast change event to the phy first and then let
         * the phy redirect the broadcast change to the port object */
        case SCU_EVENT_TYPE_ERR_CNT_EVENT:
        /*
         * direct error counter event to the phy object since that is where
         * we get the event notification.  This is a type 4 event. */
        case SCU_EVENT_TYPE_OSSP_EVENT:
                index = SCU_GET_PROTOCOL_ENGINE_INDEX(completion_entry);
                phy = &ihost->phys[index].sci;
                scic_sds_phy_event_handler(phy, completion_entry);
                break;

        case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
        case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
        case SCU_EVENT_TYPE_RNC_OPS_MISC:
                if (index < scic->remote_node_entries) {
                        device = scic->device_table[index];

                        if (device != NULL)
                                scic_sds_remote_device_event_handler(device, completion_entry);
                } else
                        dev_err(scic_to_dev(scic),
                                "%s: SCIC Controller 0x%p received event 0x%x "
                                "for remote device object 0x%0x that doesnt "
                                "exist.\n",
                                __func__,
                                scic,
                                completion_entry,
                                index);

                break;

        default:
                dev_warn(scic_to_dev(scic),
                         "%s: SCIC Controller received unknown event code %x\n",
                         __func__,
                         completion_entry);
                break;
        }
}



static void scic_sds_controller_process_completions(struct scic_sds_controller *scic)
{
        u32 completion_count = 0;
        u32 completion_entry;
        u32 get_index;
        u32 get_cycle;
        u32 event_index;
        u32 event_cycle;

        dev_dbg(scic_to_dev(scic),
                "%s: completion queue begining get:0x%08x\n",
                __func__,
                scic->completion_queue_get);

        /* Get the component parts of the completion queue */
        get_index = NORMALIZE_GET_POINTER(scic->completion_queue_get);
        get_cycle = SMU_CQGR_CYCLE_BIT & scic->completion_queue_get;

        event_index = NORMALIZE_EVENT_POINTER(scic->completion_queue_get);
        event_cycle = SMU_CQGR_EVENT_CYCLE_BIT & scic->completion_queue_get;

        while (
                NORMALIZE_GET_POINTER_CYCLE_BIT(get_cycle)
                == COMPLETION_QUEUE_CYCLE_BIT(scic->completion_queue[get_index])
                ) {
                completion_count++;

                completion_entry = scic->completion_queue[get_index];
                INCREMENT_COMPLETION_QUEUE_GET(scic, get_index, get_cycle);

                dev_dbg(scic_to_dev(scic),
                        "%s: completion queue entry:0x%08x\n",
                        __func__,
                        completion_entry);

                switch (SCU_GET_COMPLETION_TYPE(completion_entry)) {
                case SCU_COMPLETION_TYPE_TASK:
                        scic_sds_controller_task_completion(scic, completion_entry);
                        break;

                case SCU_COMPLETION_TYPE_SDMA:
                        scic_sds_controller_sdma_completion(scic, completion_entry);
                        break;

                case SCU_COMPLETION_TYPE_UFI:
                        scic_sds_controller_unsolicited_frame(scic, completion_entry);
                        break;

                case SCU_COMPLETION_TYPE_EVENT:
                        INCREMENT_EVENT_QUEUE_GET(scic, event_index, event_cycle);
                        scic_sds_controller_event_completion(scic, completion_entry);
                        break;

                case SCU_COMPLETION_TYPE_NOTIFY:
                        /*
                         * Presently we do the same thing with a notify event that we do with the
                         * other event codes. */
                        INCREMENT_EVENT_QUEUE_GET(scic, event_index, event_cycle);
                        scic_sds_controller_event_completion(scic, completion_entry);
                        break;

                default:
                        dev_warn(scic_to_dev(scic),
                                 "%s: SCIC Controller received unknown "
                                 "completion type %x\n",
                                 __func__,
                                 completion_entry);
                        break;
                }
        }

        /* Update the get register if we completed one or more entries */
        if (completion_count > 0) {
                scic->completion_queue_get =
                        SMU_CQGR_GEN_BIT(ENABLE) |
                        SMU_CQGR_GEN_BIT(EVENT_ENABLE) |
                        event_cycle |
                        SMU_CQGR_GEN_VAL(EVENT_POINTER, event_index) |
                        get_cycle |
                        SMU_CQGR_GEN_VAL(POINTER, get_index);

                writel(scic->completion_queue_get,
                       &scic->smu_registers->completion_queue_get);

        }

        dev_dbg(scic_to_dev(scic),
                "%s: completion queue ending get:0x%08x\n",
                __func__,
                scic->completion_queue_get);

}

static void scic_sds_controller_error_handler(struct scic_sds_controller *scic)
{
        u32 interrupt_status;

        interrupt_status =
                readl(&scic->smu_registers->interrupt_status);

        if ((interrupt_status & SMU_ISR_QUEUE_SUSPEND) &&
            scic_sds_controller_completion_queue_has_entries(scic)) {

                scic_sds_controller_process_completions(scic);
                writel(SMU_ISR_QUEUE_SUSPEND, &scic->smu_registers->interrupt_status);
        } else {
                dev_err(scic_to_dev(scic), "%s: status: %#x\n", __func__,
                        interrupt_status);

                sci_base_state_machine_change_state(&scic->state_machine,
                                                    SCI_BASE_CONTROLLER_STATE_FAILED);

                return;
        }

        /* If we dont process any completions I am not sure that we want to do this.
         * We are in the middle of a hardware fault and should probably be reset.
         */
        writel(0, &scic->smu_registers->interrupt_mask);
}

irqreturn_t isci_intx_isr(int vec, void *data)
{
        irqreturn_t ret = IRQ_NONE;
        struct isci_host *ihost = data;
        struct scic_sds_controller *scic = &ihost->sci;

        if (scic_sds_controller_isr(scic)) {
                writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);
                tasklet_schedule(&ihost->completion_tasklet);
                ret = IRQ_HANDLED;
        } else if (scic_sds_controller_error_isr(scic)) {
                spin_lock(&ihost->scic_lock);
                scic_sds_controller_error_handler(scic);
                spin_unlock(&ihost->scic_lock);
                ret = IRQ_HANDLED;
        }

        return ret;
}

irqreturn_t isci_error_isr(int vec, void *data)
{
        struct isci_host *ihost = data;

        if (scic_sds_controller_error_isr(&ihost->sci))
                scic_sds_controller_error_handler(&ihost->sci);

        return IRQ_HANDLED;
}

/**
 * isci_host_start_complete() - This function is called by the core library,
 *    through the ISCI Module, to indicate controller start status.
 * @isci_host: This parameter specifies the ISCI host object
 * @completion_status: This parameter specifies the completion status from the
 *    core library.
 *
 */
static void isci_host_start_complete(struct isci_host *ihost, enum sci_status completion_status)
{
        if (completion_status != SCI_SUCCESS)
                dev_info(&ihost->pdev->dev,
                        "controller start timed out, continuing...\n");
        isci_host_change_state(ihost, isci_ready);
        clear_bit(IHOST_START_PENDING, &ihost->flags);
        wake_up(&ihost->eventq);
}

int isci_host_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
        struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;

        if (test_bit(IHOST_START_PENDING, &ihost->flags))
                return 0;

        /* todo: use sas_flush_discovery once it is upstream */
        scsi_flush_work(shost);

        scsi_flush_work(shost);

        dev_dbg(&ihost->pdev->dev,
                "%s: ihost->status = %d, time = %ld\n",
                 __func__, isci_host_get_state(ihost), time);

        return 1;

}

/**
 * scic_controller_get_suggested_start_timeout() - This method returns the
 *    suggested scic_controller_start() timeout amount.  The user is free to
 *    use any timeout value, but this method provides the suggested minimum
 *    start timeout value.  The returned value is based upon empirical
 *    information determined as a result of interoperability testing.
 * @controller: the handle to the controller object for which to return the
 *    suggested start timeout.
 *
 * This method returns the number of milliseconds for the suggested start
 * operation timeout.
 */
static u32 scic_controller_get_suggested_start_timeout(
        struct scic_sds_controller *sc)
{
        /* Validate the user supplied parameters. */
        if (sc == NULL)
                return 0;

        /*
         * The suggested minimum timeout value for a controller start operation:
         *
         *     Signature FIS Timeout
         *   + Phy Start Timeout
         *   + Number of Phy Spin Up Intervals
         *   ---------------------------------
         *   Number of milliseconds for the controller start operation.
         *
         * NOTE: The number of phy spin up intervals will be equivalent
         *       to the number of phys divided by the number phys allowed
         *       per interval - 1 (once OEM parameters are supported).
         *       Currently we assume only 1 phy per interval. */

        return SCIC_SDS_SIGNATURE_FIS_TIMEOUT
                + SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT
                + ((SCI_MAX_PHYS - 1) * SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL);
}

static void scic_controller_enable_interrupts(
        struct scic_sds_controller *scic)
{
        BUG_ON(scic->smu_registers == NULL);
        writel(0, &scic->smu_registers->interrupt_mask);
}

void scic_controller_disable_interrupts(
        struct scic_sds_controller *scic)
{
        BUG_ON(scic->smu_registers == NULL);
        writel(0xffffffff, &scic->smu_registers->interrupt_mask);
}

static void scic_sds_controller_enable_port_task_scheduler(
        struct scic_sds_controller *scic)
{
        u32 port_task_scheduler_value;

        port_task_scheduler_value =
                readl(&scic->scu_registers->peg0.ptsg.control);
        port_task_scheduler_value |=
                (SCU_PTSGCR_GEN_BIT(ETM_ENABLE) |
                 SCU_PTSGCR_GEN_BIT(PTSG_ENABLE));
        writel(port_task_scheduler_value,
               &scic->scu_registers->peg0.ptsg.control);
}

static void scic_sds_controller_assign_task_entries(struct scic_sds_controller *scic)
{
        u32 task_assignment;

        /*
         * Assign all the TCs to function 0
         * TODO: Do we actually need to read this register to write it back?
         */

        task_assignment =
                readl(&scic->smu_registers->task_context_assignment[0]);

        task_assignment |= (SMU_TCA_GEN_VAL(STARTING, 0)) |
                (SMU_TCA_GEN_VAL(ENDING,  scic->task_context_entries - 1)) |
                (SMU_TCA_GEN_BIT(RANGE_CHECK_ENABLE));

        writel(task_assignment,
                &scic->smu_registers->task_context_assignment[0]);

}

static void scic_sds_controller_initialize_completion_queue(struct scic_sds_controller *scic)
{
        u32 index;
        u32 completion_queue_control_value;
        u32 completion_queue_get_value;
        u32 completion_queue_put_value;

        scic->completion_queue_get = 0;

        completion_queue_control_value = (
                SMU_CQC_QUEUE_LIMIT_SET(scic->completion_queue_entries - 1)
                | SMU_CQC_EVENT_LIMIT_SET(scic->completion_event_entries - 1)
                );

        writel(completion_queue_control_value,
               &scic->smu_registers->completion_queue_control);


        /* Set the completion queue get pointer and enable the queue */
        completion_queue_get_value = (
                (SMU_CQGR_GEN_VAL(POINTER, 0))
                | (SMU_CQGR_GEN_VAL(EVENT_POINTER, 0))
                | (SMU_CQGR_GEN_BIT(ENABLE))
                | (SMU_CQGR_GEN_BIT(EVENT_ENABLE))
                );

        writel(completion_queue_get_value,
               &scic->smu_registers->completion_queue_get);

        /* Set the completion queue put pointer */
        completion_queue_put_value = (
                (SMU_CQPR_GEN_VAL(POINTER, 0))
                | (SMU_CQPR_GEN_VAL(EVENT_POINTER, 0))
                );

        writel(completion_queue_put_value,
               &scic->smu_registers->completion_queue_put);

        /* Initialize the cycle bit of the completion queue entries */
        for (index = 0; index < scic->completion_queue_entries; index++) {
                /*
                 * If get.cycle_bit != completion_queue.cycle_bit
                 * its not a valid completion queue entry
                 * so at system start all entries are invalid */
                scic->completion_queue[index] = 0x80000000;
        }
}

static void scic_sds_controller_initialize_unsolicited_frame_queue(struct scic_sds_controller *scic)
{
        u32 frame_queue_control_value;
        u32 frame_queue_get_value;
        u32 frame_queue_put_value;

        /* Write the queue size */
        frame_queue_control_value =
                SCU_UFQC_GEN_VAL(QUEUE_SIZE,
                                 scic->uf_control.address_table.count);

        writel(frame_queue_control_value,
               &scic->scu_registers->sdma.unsolicited_frame_queue_control);

        /* Setup the get pointer for the unsolicited frame queue */
        frame_queue_get_value = (
                SCU_UFQGP_GEN_VAL(POINTER, 0)
                |  SCU_UFQGP_GEN_BIT(ENABLE_BIT)
                );

        writel(frame_queue_get_value,
               &scic->scu_registers->sdma.unsolicited_frame_get_pointer);
        /* Setup the put pointer for the unsolicited frame queue */
        frame_queue_put_value = SCU_UFQPP_GEN_VAL(POINTER, 0);
        writel(frame_queue_put_value,
               &scic->scu_registers->sdma.unsolicited_frame_put_pointer);
}

/**
 * This method will attempt to transition into the ready state for the
 *    controller and indicate that the controller start operation has completed
 *    if all criteria are met.
 * @scic: This parameter indicates the controller object for which
 *    to transition to ready.
 * @status: This parameter indicates the status value to be pass into the call
 *    to scic_cb_controller_start_complete().
 *
 * none.
 */
static void scic_sds_controller_transition_to_ready(
        struct scic_sds_controller *scic,
        enum sci_status status)
{
        struct isci_host *ihost = scic_to_ihost(scic);

        if (scic->state_machine.current_state_id ==
            SCI_BASE_CONTROLLER_STATE_STARTING) {
                /*
                 * We move into the ready state, because some of the phys/ports
                 * may be up and operational.
                 */
                sci_base_state_machine_change_state(&scic->state_machine,
                                                    SCI_BASE_CONTROLLER_STATE_READY);

                isci_host_start_complete(ihost, status);
        }
}

static void scic_sds_controller_phy_timer_stop(struct scic_sds_controller *scic)
{
        isci_timer_stop(scic->phy_startup_timer);

        scic->phy_startup_timer_pending = false;
}

static void scic_sds_controller_phy_timer_start(struct scic_sds_controller *scic)
{
        isci_timer_start(scic->phy_startup_timer,
                         SCIC_SDS_CONTROLLER_PHY_START_TIMEOUT);

        scic->phy_startup_timer_pending = true;
}

/**
 * scic_sds_controller_start_next_phy - start phy
 * @scic: controller
 *
 * If all the phys have been started, then attempt to transition the
 * controller to the READY state and inform the user
 * (scic_cb_controller_start_complete()).
 */
static enum sci_status scic_sds_controller_start_next_phy(struct scic_sds_controller *scic)
{
        struct isci_host *ihost = scic_to_ihost(scic);
        struct scic_sds_oem_params *oem = &scic->oem_parameters.sds1;
        struct scic_sds_phy *sci_phy;
        enum sci_status status;

        status = SCI_SUCCESS;

        if (scic->phy_startup_timer_pending)
                return status;

        if (scic->next_phy_to_start >= SCI_MAX_PHYS) {
                bool is_controller_start_complete = true;
                u32 state;
                u8 index;

                for (index = 0; index < SCI_MAX_PHYS; index++) {
                        sci_phy = &ihost->phys[index].sci;
                        state = sci_phy->state_machine.current_state_id;

                        if (!scic_sds_phy_get_port(sci_phy))
                                continue;

                        /* The controller start operation is complete iff:
                         * - all links have been given an opportunity to start
                         * - have no indication of a connected device
                         * - have an indication of a connected device and it has
                         *   finished the link training process.
                         */
                        if ((sci_phy->is_in_link_training == false &&
                             state == SCI_BASE_PHY_STATE_INITIAL) ||
                            (sci_phy->is_in_link_training == false &&
                             state == SCI_BASE_PHY_STATE_STOPPED) ||
                            (sci_phy->is_in_link_training == true &&
                             state == SCI_BASE_PHY_STATE_STARTING)) {
                                is_controller_start_complete = false;
                                break;
                        }
                }

                /*
                 * The controller has successfully finished the start process.
                 * Inform the SCI Core user and transition to the READY state. */
                if (is_controller_start_complete == true) {
                        scic_sds_controller_transition_to_ready(scic, SCI_SUCCESS);
                        scic_sds_controller_phy_timer_stop(scic);
                }
        } else {
                sci_phy = &ihost->phys[scic->next_phy_to_start].sci;

                if (oem->controller.mode_type == SCIC_PORT_MANUAL_CONFIGURATION_MODE) {
                        if (scic_sds_phy_get_port(sci_phy) == NULL) {
                                scic->next_phy_to_start++;

                                /* Caution recursion ahead be forwarned
                                 *
                                 * The PHY was never added to a PORT in MPC mode
                                 * so start the next phy in sequence This phy
                                 * will never go link up and will not draw power
                                 * the OEM parameters either configured the phy
                                 * incorrectly for the PORT or it was never
                                 * assigned to a PORT
                                 */
                                return scic_sds_controller_start_next_phy(scic);
                        }
                }

                status = scic_sds_phy_start(sci_phy);

                if (status == SCI_SUCCESS) {
                        scic_sds_controller_phy_timer_start(scic);
                } else {
                        dev_warn(scic_to_dev(scic),
                                 "%s: Controller stop operation failed "
                                 "to stop phy %d because of status "
                                 "%d.\n",
                                 __func__,
                                 ihost->phys[scic->next_phy_to_start].sci.phy_index,
                                 status);
                }

                scic->next_phy_to_start++;
        }

        return status;
}

static void scic_sds_controller_phy_startup_timeout_handler(void *_scic)
{
        struct scic_sds_controller *scic = _scic;
        enum sci_status status;

        scic->phy_startup_timer_pending = false;
        status = SCI_FAILURE;
        while (status != SCI_SUCCESS)
                status = scic_sds_controller_start_next_phy(scic);
}

static enum sci_status scic_controller_start(struct scic_sds_controller *scic,
                                             u32 timeout)
{
        struct isci_host *ihost = scic_to_ihost(scic);
        enum sci_status result;
        u16 index;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_INITIALIZED) {
                dev_warn(scic_to_dev(scic),
                         "SCIC Controller start operation requested in "
                         "invalid state\n");
                return SCI_FAILURE_INVALID_STATE;
        }

        /* Build the TCi free pool */
        sci_pool_initialize(scic->tci_pool);
        for (index = 0; index < scic->task_context_entries; index++)
                sci_pool_put(scic->tci_pool, index);

        /* Build the RNi free pool */
        scic_sds_remote_node_table_initialize(
                        &scic->available_remote_nodes,
                        scic->remote_node_entries);

        /*
         * Before anything else lets make sure we will not be
         * interrupted by the hardware.
         */
        scic_controller_disable_interrupts(scic);

        /* Enable the port task scheduler */
        scic_sds_controller_enable_port_task_scheduler(scic);

        /* Assign all the task entries to scic physical function */
        scic_sds_controller_assign_task_entries(scic);

        /* Now initialize the completion queue */
        scic_sds_controller_initialize_completion_queue(scic);

        /* Initialize the unsolicited frame queue for use */
        scic_sds_controller_initialize_unsolicited_frame_queue(scic);

        /* Start all of the ports on this controller */
        for (index = 0; index < scic->logical_port_entries; index++) {
                struct scic_sds_port *sci_port = &ihost->ports[index].sci;

                result = sci_port->state_handlers->start_handler(sci_port);
                if (result)
                        return result;
        }

        scic_sds_controller_start_next_phy(scic);

        isci_timer_start(scic->timeout_timer, timeout);

        sci_base_state_machine_change_state(&scic->state_machine,
                                            SCI_BASE_CONTROLLER_STATE_STARTING);

        return SCI_SUCCESS;
}

void isci_host_scan_start(struct Scsi_Host *shost)
{
        struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
        unsigned long tmo = scic_controller_get_suggested_start_timeout(&ihost->sci);

        set_bit(IHOST_START_PENDING, &ihost->flags);

        spin_lock_irq(&ihost->scic_lock);
        scic_controller_start(&ihost->sci, tmo);
        scic_controller_enable_interrupts(&ihost->sci);
        spin_unlock_irq(&ihost->scic_lock);
}

static void isci_host_stop_complete(struct isci_host *ihost, enum sci_status completion_status)
{
        isci_host_change_state(ihost, isci_stopped);
        scic_controller_disable_interrupts(&ihost->sci);
        clear_bit(IHOST_STOP_PENDING, &ihost->flags);
        wake_up(&ihost->eventq);
}

static void scic_sds_controller_completion_handler(struct scic_sds_controller *scic)
{
        /* Empty out the completion queue */
        if (scic_sds_controller_completion_queue_has_entries(scic))
                scic_sds_controller_process_completions(scic);

        /* Clear the interrupt and enable all interrupts again */
        writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);
        /* Could we write the value of SMU_ISR_COMPLETION? */
        writel(0xFF000000, &scic->smu_registers->interrupt_mask);
        writel(0, &scic->smu_registers->interrupt_mask);
}

/**
 * isci_host_completion_routine() - This function is the delayed service
 *    routine that calls the sci core library's completion handler. It's
 *    scheduled as a tasklet from the interrupt service routine when interrupts
 *    in use, or set as the timeout function in polled mode.
 * @data: This parameter specifies the ISCI host object
 *
 */
static void isci_host_completion_routine(unsigned long data)
{
        struct isci_host *isci_host = (struct isci_host *)data;
        struct list_head    completed_request_list;
        struct list_head    errored_request_list;
        struct list_head    *current_position;
        struct list_head    *next_position;
        struct isci_request *request;
        struct isci_request *next_request;
        struct sas_task     *task;

        INIT_LIST_HEAD(&completed_request_list);
        INIT_LIST_HEAD(&errored_request_list);

        spin_lock_irq(&isci_host->scic_lock);

        scic_sds_controller_completion_handler(&isci_host->sci);

        /* Take the lists of completed I/Os from the host. */

        list_splice_init(&isci_host->requests_to_complete,
                         &completed_request_list);

        /* Take the list of errored I/Os from the host. */
        list_splice_init(&isci_host->requests_to_errorback,
                         &errored_request_list);

        spin_unlock_irq(&isci_host->scic_lock);

        /* Process any completions in the lists. */
        list_for_each_safe(current_position, next_position,
                           &completed_request_list) {

                request = list_entry(current_position, struct isci_request,
                                     completed_node);
                task = isci_request_access_task(request);

                /* Normal notification (task_done) */
                dev_dbg(&isci_host->pdev->dev,
                        "%s: Normal - request/task = %p/%p\n",
                        __func__,
                        request,
                        task);

                /* Return the task to libsas */
                if (task != NULL) {

                        task->lldd_task = NULL;
                        if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {

                                /* If the task is already in the abort path,
                                * the task_done callback cannot be called.
                                */
                                task->task_done(task);
                        }
                }
                /* Free the request object. */
                isci_request_free(isci_host, request);
        }
        list_for_each_entry_safe(request, next_request, &errored_request_list,
                                 completed_node) {

                task = isci_request_access_task(request);

                /* Use sas_task_abort */
                dev_warn(&isci_host->pdev->dev,
                         "%s: Error - request/task = %p/%p\n",
                         __func__,
                         request,
                         task);

                if (task != NULL) {

                        /* Put the task into the abort path if it's not there
                         * already.
                         */
                        if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED))
                                sas_task_abort(task);

                } else {
                        /* This is a case where the request has completed with a
                         * status such that it needed further target servicing,
                         * but the sas_task reference has already been removed
                         * from the request.  Since it was errored, it was not
                         * being aborted, so there is nothing to do except free
                         * it.
                         */

                        spin_lock_irq(&isci_host->scic_lock);
                        /* Remove the request from the remote device's list
                        * of pending requests.
                        */
                        list_del_init(&request->dev_node);
                        spin_unlock_irq(&isci_host->scic_lock);

                        /* Free the request object. */
                        isci_request_free(isci_host, request);
                }
        }

}

/**
 * scic_controller_stop() - This method will stop an individual controller
 *    object.This method will invoke the associated user callback upon
 *    completion.  The completion callback is called when the following
 *    conditions are met: -# the method return status is SCI_SUCCESS. -# the
 *    controller has been quiesced. This method will ensure that all IO
 *    requests are quiesced, phys are stopped, and all additional operation by
 *    the hardware is halted.
 * @controller: the handle to the controller object to stop.
 * @timeout: This parameter specifies the number of milliseconds in which the
 *    stop operation should complete.
 *
 * The controller must be in the STARTED or STOPPED state. Indicate if the
 * controller stop method succeeded or failed in some way. SCI_SUCCESS if the
 * stop operation successfully began. SCI_WARNING_ALREADY_IN_STATE if the
 * controller is already in the STOPPED state. SCI_FAILURE_INVALID_STATE if the
 * controller is not either in the STARTED or STOPPED states.
 */
static enum sci_status scic_controller_stop(struct scic_sds_controller *scic,
                                            u32 timeout)
{
        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_READY) {
                dev_warn(scic_to_dev(scic),
                         "SCIC Controller stop operation requested in "
                         "invalid state\n");
                return SCI_FAILURE_INVALID_STATE;
        }

        isci_timer_start(scic->timeout_timer, timeout);
        sci_base_state_machine_change_state(&scic->state_machine,
                                            SCI_BASE_CONTROLLER_STATE_STOPPING);
        return SCI_SUCCESS;
}

/**
 * scic_controller_reset() - This method will reset the supplied core
 *    controller regardless of the state of said controller.  This operation is
 *    considered destructive.  In other words, all current operations are wiped
 *    out.  No IO completions for outstanding devices occur.  Outstanding IO
 *    requests are not aborted or completed at the actual remote device.
 * @controller: the handle to the controller object to reset.
 *
 * Indicate if the controller reset method succeeded or failed in some way.
 * SCI_SUCCESS if the reset operation successfully started. SCI_FATAL_ERROR if
 * the controller reset operation is unable to complete.
 */
static enum sci_status scic_controller_reset(struct scic_sds_controller *scic)
{
        switch (scic->state_machine.current_state_id) {
        case SCI_BASE_CONTROLLER_STATE_RESET:
        case SCI_BASE_CONTROLLER_STATE_READY:
        case SCI_BASE_CONTROLLER_STATE_STOPPED:
        case SCI_BASE_CONTROLLER_STATE_FAILED:
                /*
                 * The reset operation is not a graceful cleanup, just
                 * perform the state transition.
                 */
                sci_base_state_machine_change_state(&scic->state_machine,
                                SCI_BASE_CONTROLLER_STATE_RESETTING);
                return SCI_SUCCESS;
        default:
                dev_warn(scic_to_dev(scic),
                         "SCIC Controller reset operation requested in "
                         "invalid state\n");
                return SCI_FAILURE_INVALID_STATE;
        }
}

void isci_host_deinit(struct isci_host *ihost)
{
        int i;

        isci_host_change_state(ihost, isci_stopping);
        for (i = 0; i < SCI_MAX_PORTS; i++) {
                struct isci_port *iport = &ihost->ports[i];
                struct isci_remote_device *idev, *d;

                list_for_each_entry_safe(idev, d, &iport->remote_dev_list, node) {
                        isci_remote_device_change_state(idev, isci_stopping);
                        isci_remote_device_stop(ihost, idev);
                }
        }

        set_bit(IHOST_STOP_PENDING, &ihost->flags);

        spin_lock_irq(&ihost->scic_lock);
        scic_controller_stop(&ihost->sci, SCIC_CONTROLLER_STOP_TIMEOUT);
        spin_unlock_irq(&ihost->scic_lock);

        wait_for_stop(ihost);
        scic_controller_reset(&ihost->sci);
        isci_timer_list_destroy(ihost);
}

static void __iomem *scu_base(struct isci_host *isci_host)
{
        struct pci_dev *pdev = isci_host->pdev;
        int id = isci_host->id;

        return pcim_iomap_table(pdev)[SCI_SCU_BAR * 2] + SCI_SCU_BAR_SIZE * id;
}

static void __iomem *smu_base(struct isci_host *isci_host)
{
        struct pci_dev *pdev = isci_host->pdev;
        int id = isci_host->id;

        return pcim_iomap_table(pdev)[SCI_SMU_BAR * 2] + SCI_SMU_BAR_SIZE * id;
}

static void isci_user_parameters_get(
                struct isci_host *isci_host,
                union scic_user_parameters *scic_user_params)
{
        struct scic_sds_user_parameters *u = &scic_user_params->sds1;
        int i;

        for (i = 0; i < SCI_MAX_PHYS; i++) {
                struct sci_phy_user_params *u_phy = &u->phys[i];

                u_phy->max_speed_generation = phy_gen;

                /* we are not exporting these for now */
                u_phy->align_insertion_frequency = 0x7f;
                u_phy->in_connection_align_insertion_frequency = 0xff;
                u_phy->notify_enable_spin_up_insertion_frequency = 0x33;
        }

        u->stp_inactivity_timeout = stp_inactive_to;
        u->ssp_inactivity_timeout = ssp_inactive_to;
        u->stp_max_occupancy_timeout = stp_max_occ_to;
        u->ssp_max_occupancy_timeout = ssp_max_occ_to;
        u->no_outbound_task_timeout = no_outbound_task_to;
        u->max_number_concurrent_device_spin_up = max_concurr_spinup;
}

static void scic_sds_controller_initial_state_enter(void *object)
{
        struct scic_sds_controller *scic = object;

        sci_base_state_machine_change_state(&scic->state_machine,
                        SCI_BASE_CONTROLLER_STATE_RESET);
}

static inline void scic_sds_controller_starting_state_exit(void *object)
{
        struct scic_sds_controller *scic = object;

        isci_timer_stop(scic->timeout_timer);
}

#define INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_LOWER_BOUND_NS 853
#define INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_UPPER_BOUND_NS 1280
#define INTERRUPT_COALESCE_TIMEOUT_MAX_US                    2700000
#define INTERRUPT_COALESCE_NUMBER_MAX                        256
#define INTERRUPT_COALESCE_TIMEOUT_ENCODE_MIN                7
#define INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX                28

/**
 * scic_controller_set_interrupt_coalescence() - This method allows the user to
 *    configure the interrupt coalescence.
 * @controller: This parameter represents the handle to the controller object
 *    for which its interrupt coalesce register is overridden.
 * @coalesce_number: Used to control the number of entries in the Completion
 *    Queue before an interrupt is generated. If the number of entries exceed
 *    this number, an interrupt will be generated. The valid range of the input
 *    is [0, 256]. A setting of 0 results in coalescing being disabled.
 * @coalesce_timeout: Timeout value in microseconds. The valid range of the
 *    input is [0, 2700000] . A setting of 0 is allowed and results in no
 *    interrupt coalescing timeout.
 *
 * Indicate if the user successfully set the interrupt coalesce parameters.
 * SCI_SUCCESS The user successfully updated the interrutp coalescence.
 * SCI_FAILURE_INVALID_PARAMETER_VALUE The user input value is out of range.
 */
static enum sci_status scic_controller_set_interrupt_coalescence(
        struct scic_sds_controller *scic_controller,
        u32 coalesce_number,
        u32 coalesce_timeout)
{
        u8 timeout_encode = 0;
        u32 min = 0;
        u32 max = 0;

        /* Check if the input parameters fall in the range. */
        if (coalesce_number > INTERRUPT_COALESCE_NUMBER_MAX)
                return SCI_FAILURE_INVALID_PARAMETER_VALUE;

        /*
         *  Defined encoding for interrupt coalescing timeout:
         *              Value   Min      Max     Units
         *              -----   ---      ---     -----
         *              0       -        -       Disabled
         *              1       13.3     20.0    ns
         *              2       26.7     40.0
         *              3       53.3     80.0
         *              4       106.7    160.0
         *              5       213.3    320.0
         *              6       426.7    640.0
         *              7       853.3    1280.0
         *              8       1.7      2.6     us
         *              9       3.4      5.1
         *              10      6.8      10.2
         *              11      13.7     20.5
         *              12      27.3     41.0
         *              13      54.6     81.9
         *              14      109.2    163.8
         *              15      218.5    327.7
         *              16      436.9    655.4
         *              17      873.8    1310.7
         *              18      1.7      2.6     ms
         *              19      3.5      5.2
         *              20      7.0      10.5
         *              21      14.0     21.0
         *              22      28.0     41.9
         *              23      55.9     83.9
         *              24      111.8    167.8
         *              25      223.7    335.5
         *              26      447.4    671.1
         *              27      894.8    1342.2
         *              28      1.8      2.7     s
         *              Others Undefined */

        /*
         * Use the table above to decide the encode of interrupt coalescing timeout
         * value for register writing. */
        if (coalesce_timeout == 0)
                timeout_encode = 0;
        else{
                /* make the timeout value in unit of (10 ns). */
                coalesce_timeout = coalesce_timeout * 100;
                min = INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_LOWER_BOUND_NS / 10;
                max = INTERRUPT_COALESCE_TIMEOUT_BASE_RANGE_UPPER_BOUND_NS / 10;

                /* get the encode of timeout for register writing. */
                for (timeout_encode = INTERRUPT_COALESCE_TIMEOUT_ENCODE_MIN;
                      timeout_encode <= INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX;
                      timeout_encode++) {
                        if (min <= coalesce_timeout &&  max > coalesce_timeout)
                                break;
                        else if (coalesce_timeout >= max && coalesce_timeout < min * 2
                                 && coalesce_timeout <= INTERRUPT_COALESCE_TIMEOUT_MAX_US * 100) {
                                if ((coalesce_timeout - max) < (2 * min - coalesce_timeout))
                                        break;
                                else{
                                        timeout_encode++;
                                        break;
                                }
                        } else {
                                max = max * 2;
                                min = min * 2;
                        }
                }

                if (timeout_encode == INTERRUPT_COALESCE_TIMEOUT_ENCODE_MAX + 1)
                        /* the value is out of range. */
                        return SCI_FAILURE_INVALID_PARAMETER_VALUE;
        }

        writel(SMU_ICC_GEN_VAL(NUMBER, coalesce_number) |
               SMU_ICC_GEN_VAL(TIMER, timeout_encode),
               &scic_controller->smu_registers->interrupt_coalesce_control);


        scic_controller->interrupt_coalesce_number = (u16)coalesce_number;
        scic_controller->interrupt_coalesce_timeout = coalesce_timeout / 100;

        return SCI_SUCCESS;
}


static void scic_sds_controller_ready_state_enter(void *object)
{
        struct scic_sds_controller *scic = object;

        /* set the default interrupt coalescence number and timeout value. */
        scic_controller_set_interrupt_coalescence(scic, 0x10, 250);
}

static void scic_sds_controller_ready_state_exit(void *object)
{
        struct scic_sds_controller *scic = object;

        /* disable interrupt coalescence. */
        scic_controller_set_interrupt_coalescence(scic, 0, 0);
}

static enum sci_status scic_sds_controller_stop_phys(struct scic_sds_controller *scic)
{
        u32 index;
        enum sci_status status;
        enum sci_status phy_status;
        struct isci_host *ihost = scic_to_ihost(scic);

        status = SCI_SUCCESS;

        for (index = 0; index < SCI_MAX_PHYS; index++) {
                phy_status = scic_sds_phy_stop(&ihost->phys[index].sci);

                if (phy_status != SCI_SUCCESS &&
                    phy_status != SCI_FAILURE_INVALID_STATE) {
                        status = SCI_FAILURE;

                        dev_warn(scic_to_dev(scic),
                                 "%s: Controller stop operation failed to stop "
                                 "phy %d because of status %d.\n",
                                 __func__,
                                 ihost->phys[index].sci.phy_index, phy_status);
                }
        }

        return status;
}

static enum sci_status scic_sds_controller_stop_ports(struct scic_sds_controller *scic)
{
        u32 index;
        enum sci_status port_status;
        enum sci_status status = SCI_SUCCESS;
        struct isci_host *ihost = scic_to_ihost(scic);

        for (index = 0; index < scic->logical_port_entries; index++) {
                struct scic_sds_port *sci_port = &ihost->ports[index].sci;
                scic_sds_port_handler_t stop;

                stop = sci_port->state_handlers->stop_handler;
                port_status = stop(sci_port);

                if ((port_status != SCI_SUCCESS) &&
                    (port_status != SCI_FAILURE_INVALID_STATE)) {
                        status = SCI_FAILURE;

                        dev_warn(scic_to_dev(scic),
                                 "%s: Controller stop operation failed to "
                                 "stop port %d because of status %d.\n",
                                 __func__,
                                 sci_port->logical_port_index,
                                 port_status);
                }
        }

        return status;
}

static enum sci_status scic_sds_controller_stop_devices(struct scic_sds_controller *scic)
{
        u32 index;
        enum sci_status status;
        enum sci_status device_status;

        status = SCI_SUCCESS;

        for (index = 0; index < scic->remote_node_entries; index++) {
                if (scic->device_table[index] != NULL) {
                        /* / @todo What timeout value do we want to provide to this request? */
                        device_status = scic_remote_device_stop(scic->device_table[index], 0);

                        if ((device_status != SCI_SUCCESS) &&
                            (device_status != SCI_FAILURE_INVALID_STATE)) {
                                dev_warn(scic_to_dev(scic),
                                         "%s: Controller stop operation failed "
                                         "to stop device 0x%p because of "
                                         "status %d.\n",
                                         __func__,
                                         scic->device_table[index], device_status);
                        }
                }
        }

        return status;
}

static void scic_sds_controller_stopping_state_enter(void *object)
{
        struct scic_sds_controller *scic = object;

        /* Stop all of the components for this controller */
        scic_sds_controller_stop_phys(scic);
        scic_sds_controller_stop_ports(scic);
        scic_sds_controller_stop_devices(scic);
}

static void scic_sds_controller_stopping_state_exit(void *object)
{
        struct scic_sds_controller *scic = object;

        isci_timer_stop(scic->timeout_timer);
}


/**
 * scic_sds_controller_reset_hardware() -
 *
 * This method will reset the controller hardware.
 */
static void scic_sds_controller_reset_hardware(struct scic_sds_controller *scic)
{
        /* Disable interrupts so we dont take any spurious interrupts */
        scic_controller_disable_interrupts(scic);

        /* Reset the SCU */
        writel(0xFFFFFFFF, &scic->smu_registers->soft_reset_control);

        /* Delay for 1ms to before clearing the CQP and UFQPR. */
        udelay(1000);

        /* The write to the CQGR clears the CQP */
        writel(0x00000000, &scic->smu_registers->completion_queue_get);

        /* The write to the UFQGP clears the UFQPR */
        writel(0, &scic->scu_registers->sdma.unsolicited_frame_get_pointer);
}

static void scic_sds_controller_resetting_state_enter(void *object)
{
        struct scic_sds_controller *scic = object;

        scic_sds_controller_reset_hardware(scic);
        sci_base_state_machine_change_state(&scic->state_machine,
                                            SCI_BASE_CONTROLLER_STATE_RESET);
}

static const struct sci_base_state scic_sds_controller_state_table[] = {
        [SCI_BASE_CONTROLLER_STATE_INITIAL] = {
                .enter_state = scic_sds_controller_initial_state_enter,
        },
        [SCI_BASE_CONTROLLER_STATE_RESET] = {},
        [SCI_BASE_CONTROLLER_STATE_INITIALIZING] = {},
        [SCI_BASE_CONTROLLER_STATE_INITIALIZED] = {},
        [SCI_BASE_CONTROLLER_STATE_STARTING] = {
                .exit_state  = scic_sds_controller_starting_state_exit,
        },
        [SCI_BASE_CONTROLLER_STATE_READY] = {
                .enter_state = scic_sds_controller_ready_state_enter,
                .exit_state  = scic_sds_controller_ready_state_exit,
        },
        [SCI_BASE_CONTROLLER_STATE_RESETTING] = {
                .enter_state = scic_sds_controller_resetting_state_enter,
        },
        [SCI_BASE_CONTROLLER_STATE_STOPPING] = {
                .enter_state = scic_sds_controller_stopping_state_enter,
                .exit_state = scic_sds_controller_stopping_state_exit,
        },
        [SCI_BASE_CONTROLLER_STATE_STOPPED] = {},
        [SCI_BASE_CONTROLLER_STATE_FAILED] = {}
};

static void scic_sds_controller_set_default_config_parameters(struct scic_sds_controller *scic)
{
        /* these defaults are overridden by the platform / firmware */
        struct isci_host *ihost = scic_to_ihost(scic);
        u16 index;

        /* Default to APC mode. */
        scic->oem_parameters.sds1.controller.mode_type = SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE;

        /* Default to APC mode. */
        scic->oem_parameters.sds1.controller.max_concurrent_dev_spin_up = 1;

        /* Default to no SSC operation. */
        scic->oem_parameters.sds1.controller.do_enable_ssc = false;

        /* Initialize all of the port parameter information to narrow ports. */
        for (index = 0; index < SCI_MAX_PORTS; index++) {
                scic->oem_parameters.sds1.ports[index].phy_mask = 0;
        }

        /* Initialize all of the phy parameter information. */
        for (index = 0; index < SCI_MAX_PHYS; index++) {
                /* Default to 6G (i.e. Gen 3) for now. */
                scic->user_parameters.sds1.phys[index].max_speed_generation = 3;

                /* the frequencies cannot be 0 */
                scic->user_parameters.sds1.phys[index].align_insertion_frequency = 0x7f;
                scic->user_parameters.sds1.phys[index].in_connection_align_insertion_frequency = 0xff;
                scic->user_parameters.sds1.phys[index].notify_enable_spin_up_insertion_frequency = 0x33;

                /*
                 * Previous Vitesse based expanders had a arbitration issue that
                 * is worked around by having the upper 32-bits of SAS address
                 * with a value greater then the Vitesse company identifier.
                 * Hence, usage of 0x5FCFFFFF. */
                scic->oem_parameters.sds1.phys[index].sas_address.low = 0x1 + ihost->id;
                scic->oem_parameters.sds1.phys[index].sas_address.high = 0x5FCFFFFF;
        }

        scic->user_parameters.sds1.stp_inactivity_timeout = 5;
        scic->user_parameters.sds1.ssp_inactivity_timeout = 5;
        scic->user_parameters.sds1.stp_max_occupancy_timeout = 5;
        scic->user_parameters.sds1.ssp_max_occupancy_timeout = 20;
        scic->user_parameters.sds1.no_outbound_task_timeout = 20;
}



/**
 * scic_controller_construct() - This method will attempt to construct a
 *    controller object utilizing the supplied parameter information.
 * @c: This parameter specifies the controller to be constructed.
 * @scu_base: mapped base address of the scu registers
 * @smu_base: mapped base address of the smu registers
 *
 * Indicate if the controller was successfully constructed or if it failed in
 * some way. SCI_SUCCESS This value is returned if the controller was
 * successfully constructed. SCI_WARNING_TIMER_CONFLICT This value is returned
 * if the interrupt coalescence timer may cause SAS compliance issues for SMP
 * Target mode response processing. SCI_FAILURE_UNSUPPORTED_CONTROLLER_TYPE
 * This value is returned if the controller does not support the supplied type.
 * SCI_FAILURE_UNSUPPORTED_INIT_DATA_VERSION This value is returned if the
 * controller does not support the supplied initialization data version.
 */
static enum sci_status scic_controller_construct(struct scic_sds_controller *scic,
                                          void __iomem *scu_base,
                                          void __iomem *smu_base)
{
        struct isci_host *ihost = scic_to_ihost(scic);
        u8 i;

        sci_base_state_machine_construct(&scic->state_machine,
                scic, scic_sds_controller_state_table,
                SCI_BASE_CONTROLLER_STATE_INITIAL);

        sci_base_state_machine_start(&scic->state_machine);

        scic->scu_registers = scu_base;
        scic->smu_registers = smu_base;

        scic_sds_port_configuration_agent_construct(&scic->port_agent);

        /* Construct the ports for this controller */
        for (i = 0; i < SCI_MAX_PORTS; i++)
                scic_sds_port_construct(&ihost->ports[i].sci, i, scic);
        scic_sds_port_construct(&ihost->ports[i].sci, SCIC_SDS_DUMMY_PORT, scic);

        /* Construct the phys for this controller */
        for (i = 0; i < SCI_MAX_PHYS; i++) {
                /* Add all the PHYs to the dummy port */
                scic_sds_phy_construct(&ihost->phys[i].sci,
                                       &ihost->ports[SCI_MAX_PORTS].sci, i);
        }

        scic->invalid_phy_mask = 0;

        /* Set the default maximum values */
        scic->completion_event_entries      = SCU_EVENT_COUNT;
        scic->completion_queue_entries      = SCU_COMPLETION_QUEUE_COUNT;
        scic->remote_node_entries           = SCI_MAX_REMOTE_DEVICES;
        scic->logical_port_entries          = SCI_MAX_PORTS;
        scic->task_context_entries          = SCU_IO_REQUEST_COUNT;
        scic->uf_control.buffers.count      = SCU_UNSOLICITED_FRAME_COUNT;
        scic->uf_control.address_table.count = SCU_UNSOLICITED_FRAME_COUNT;

        /* Initialize the User and OEM parameters to default values. */
        scic_sds_controller_set_default_config_parameters(scic);

        return scic_controller_reset(scic);
}

int scic_oem_parameters_validate(struct scic_sds_oem_params *oem)
{
        int i;

        for (i = 0; i < SCI_MAX_PORTS; i++)
                if (oem->ports[i].phy_mask > SCIC_SDS_PARM_PHY_MASK_MAX)
                        return -EINVAL;

        for (i = 0; i < SCI_MAX_PHYS; i++)
                if (oem->phys[i].sas_address.high == 0 &&
                    oem->phys[i].sas_address.low == 0)
                        return -EINVAL;

        if (oem->controller.mode_type == SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE) {
                for (i = 0; i < SCI_MAX_PHYS; i++)
                        if (oem->ports[i].phy_mask != 0)
                                return -EINVAL;
        } else if (oem->controller.mode_type == SCIC_PORT_MANUAL_CONFIGURATION_MODE) {
                u8 phy_mask = 0;

                for (i = 0; i < SCI_MAX_PHYS; i++)
                        phy_mask |= oem->ports[i].phy_mask;

                if (phy_mask == 0)
                        return -EINVAL;
        } else
                return -EINVAL;

        if (oem->controller.max_concurrent_dev_spin_up > MAX_CONCURRENT_DEVICE_SPIN_UP_COUNT)
                return -EINVAL;

        return 0;
}

static enum sci_status scic_oem_parameters_set(struct scic_sds_controller *scic,
                                        union scic_oem_parameters *scic_parms)
{
        u32 state = scic->state_machine.current_state_id;

        if (state == SCI_BASE_CONTROLLER_STATE_RESET ||
            state == SCI_BASE_CONTROLLER_STATE_INITIALIZING ||
            state == SCI_BASE_CONTROLLER_STATE_INITIALIZED) {

                if (scic_oem_parameters_validate(&scic_parms->sds1))
                        return SCI_FAILURE_INVALID_PARAMETER_VALUE;
                scic->oem_parameters.sds1 = scic_parms->sds1;

                return SCI_SUCCESS;
        }

        return SCI_FAILURE_INVALID_STATE;
}

void scic_oem_parameters_get(
        struct scic_sds_controller *scic,
        union scic_oem_parameters *scic_parms)
{
        memcpy(scic_parms, (&scic->oem_parameters), sizeof(*scic_parms));
}

static void scic_sds_controller_timeout_handler(void *_scic)
{
        struct scic_sds_controller *scic = _scic;
        struct isci_host *ihost = scic_to_ihost(scic);
        struct sci_base_state_machine *sm = &scic->state_machine;

        if (sm->current_state_id == SCI_BASE_CONTROLLER_STATE_STARTING)
                scic_sds_controller_transition_to_ready(scic, SCI_FAILURE_TIMEOUT);
        else if (sm->current_state_id == SCI_BASE_CONTROLLER_STATE_STOPPING) {
                sci_base_state_machine_change_state(sm, SCI_BASE_CONTROLLER_STATE_FAILED);
                isci_host_stop_complete(ihost, SCI_FAILURE_TIMEOUT);
        } else  /* / @todo Now what do we want to do in this case? */
                dev_err(scic_to_dev(scic),
                        "%s: Controller timer fired when controller was not "
                        "in a state being timed.\n",
                        __func__);
}

static enum sci_status scic_sds_controller_initialize_phy_startup(struct scic_sds_controller *scic)
{
        struct isci_host *ihost = scic_to_ihost(scic);

        scic->phy_startup_timer = isci_timer_create(ihost,
                                                    scic,
                                                    scic_sds_controller_phy_startup_timeout_handler);

        if (scic->phy_startup_timer == NULL)
                return SCI_FAILURE_INSUFFICIENT_RESOURCES;
        else {
                scic->next_phy_to_start = 0;
                scic->phy_startup_timer_pending = false;
        }

        return SCI_SUCCESS;
}

static void scic_sds_controller_power_control_timer_start(struct scic_sds_controller *scic)
{
        isci_timer_start(scic->power_control.timer,
                         SCIC_SDS_CONTROLLER_POWER_CONTROL_INTERVAL);

        scic->power_control.timer_started = true;
}

static void scic_sds_controller_power_control_timer_stop(struct scic_sds_controller *scic)
{
        if (scic->power_control.timer_started) {
                isci_timer_stop(scic->power_control.timer);
                scic->power_control.timer_started = false;
        }
}

static void scic_sds_controller_power_control_timer_restart(struct scic_sds_controller *scic)
{
        scic_sds_controller_power_control_timer_stop(scic);
        scic_sds_controller_power_control_timer_start(scic);
}

static void scic_sds_controller_power_control_timer_handler(
        void *controller)
{
        struct scic_sds_controller *scic;

        scic = (struct scic_sds_controller *)controller;

        scic->power_control.phys_granted_power = 0;

        if (scic->power_control.phys_waiting == 0) {
                scic->power_control.timer_started = false;
        } else {
                struct scic_sds_phy *sci_phy = NULL;
                u8 i;

                for (i = 0;
                     (i < SCI_MAX_PHYS)
                     && (scic->power_control.phys_waiting != 0);
                     i++) {
                        if (scic->power_control.requesters[i] != NULL) {
                                if (scic->power_control.phys_granted_power <
                                    scic->oem_parameters.sds1.controller.max_concurrent_dev_spin_up) {
                                        sci_phy = scic->power_control.requesters[i];
                                        scic->power_control.requesters[i] = NULL;
                                        scic->power_control.phys_waiting--;
                                        scic->power_control.phys_granted_power++;
                                        scic_sds_phy_consume_power_handler(sci_phy);
                                } else {
                                        break;
                                }
                        }
                }

                /*
                 * It doesn't matter if the power list is empty, we need to start the
                 * timer in case another phy becomes ready.
                 */
                scic_sds_controller_power_control_timer_start(scic);
        }
}

/**
 * This method inserts the phy in the stagger spinup control queue.
 * @scic:
 *
 *
 */
void scic_sds_controller_power_control_queue_insert(
        struct scic_sds_controller *scic,
        struct scic_sds_phy *sci_phy)
{
        BUG_ON(sci_phy == NULL);

        if (scic->power_control.phys_granted_power <
            scic->oem_parameters.sds1.controller.max_concurrent_dev_spin_up) {
                scic->power_control.phys_granted_power++;
                scic_sds_phy_consume_power_handler(sci_phy);

                /*
                 * stop and start the power_control timer. When the timer fires, the
                 * no_of_phys_granted_power will be set to 0
                 */
                scic_sds_controller_power_control_timer_restart(scic);
        } else {
                /* Add the phy in the waiting list */
                scic->power_control.requesters[sci_phy->phy_index] = sci_phy;
                scic->power_control.phys_waiting++;
        }
}

/**
 * This method removes the phy from the stagger spinup control queue.
 * @scic:
 *
 *
 */
void scic_sds_controller_power_control_queue_remove(
        struct scic_sds_controller *scic,
        struct scic_sds_phy *sci_phy)
{
        BUG_ON(sci_phy == NULL);

        if (scic->power_control.requesters[sci_phy->phy_index] != NULL) {
                scic->power_control.phys_waiting--;
        }

        scic->power_control.requesters[sci_phy->phy_index] = NULL;
}

#define AFE_REGISTER_WRITE_DELAY 10

/* Initialize the AFE for this phy index. We need to read the AFE setup from
 * the OEM parameters
 */
static void scic_sds_controller_afe_initialization(struct scic_sds_controller *scic)
{
        const struct scic_sds_oem_params *oem = &scic->oem_parameters.sds1;
        u32 afe_status;
        u32 phy_id;

        /* Clear DFX Status registers */
        writel(0x0081000f, &scic->scu_registers->afe.afe_dfx_master_control0);
        udelay(AFE_REGISTER_WRITE_DELAY);

        if (is_b0()) {
                /* PM Rx Equalization Save, PM SPhy Rx Acknowledgement
                 * Timer, PM Stagger Timer */
                writel(0x0007BFFF, &scic->scu_registers->afe.afe_pmsn_master_control2);
                udelay(AFE_REGISTER_WRITE_DELAY);
        }

        /* Configure bias currents to normal */
        if (is_a0())
                writel(0x00005500, &scic->scu_registers->afe.afe_bias_control);
        else if (is_a2())
                writel(0x00005A00, &scic->scu_registers->afe.afe_bias_control);
        else if (is_b0())
                writel(0x00005F00, &scic->scu_registers->afe.afe_bias_control);

        udelay(AFE_REGISTER_WRITE_DELAY);

        /* Enable PLL */
        if (is_b0())
                writel(0x80040A08, &scic->scu_registers->afe.afe_pll_control0);
        else
                writel(0x80040908, &scic->scu_registers->afe.afe_pll_control0);

        udelay(AFE_REGISTER_WRITE_DELAY);

        /* Wait for the PLL to lock */
        do {
                afe_status = readl(&scic->scu_registers->afe.afe_common_block_status);
                udelay(AFE_REGISTER_WRITE_DELAY);
        } while ((afe_status & 0x00001000) == 0);

        if (is_a0() || is_a2()) {
                /* Shorten SAS SNW lock time (RxLock timer value from 76 us to 50 us) */
                writel(0x7bcc96ad, &scic->scu_registers->afe.afe_pmsn_master_control0);
                udelay(AFE_REGISTER_WRITE_DELAY);
        }

        for (phy_id = 0; phy_id < SCI_MAX_PHYS; phy_id++) {
                const struct sci_phy_oem_params *oem_phy = &oem->phys[phy_id];

                if (is_b0()) {
                         /* Configure transmitter SSC parameters */
                        writel(0x00030000, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_ssc_control);
                        udelay(AFE_REGISTER_WRITE_DELAY);
                } else {
                        /*
                         * All defaults, except the Receive Word Alignament/Comma Detect
                         * Enable....(0xe800) */
                        writel(0x00004512, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_xcvr_control0);
                        udelay(AFE_REGISTER_WRITE_DELAY);

                        writel(0x0050100F, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_xcvr_control1);
                        udelay(AFE_REGISTER_WRITE_DELAY);
                }

                /*
                 * Power up TX and RX out from power down (PWRDNTX and PWRDNRX)
                 * & increase TX int & ext bias 20%....(0xe85c) */
                if (is_a0())
                        writel(0x000003D4, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_channel_control);
                else if (is_a2())
                        writel(0x000003F0, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_channel_control);
                else {
                         /* Power down TX and RX (PWRDNTX and PWRDNRX) */
                        writel(0x000003d7, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_channel_control);
                        udelay(AFE_REGISTER_WRITE_DELAY);

                        /*
                         * Power up TX and RX out from power down (PWRDNTX and PWRDNRX)
                         * & increase TX int & ext bias 20%....(0xe85c) */
                        writel(0x000003d4, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_channel_control);
                }
                udelay(AFE_REGISTER_WRITE_DELAY);

                if (is_a0() || is_a2()) {
                        /* Enable TX equalization (0xe824) */
                        writel(0x00040000, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_control);
                        udelay(AFE_REGISTER_WRITE_DELAY);
                }

                /*
                 * RDPI=0x0(RX Power On), RXOOBDETPDNC=0x0, TPD=0x0(TX Power On),
                 * RDD=0x0(RX Detect Enabled) ....(0xe800) */
                writel(0x00004100, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_xcvr_control0);
                udelay(AFE_REGISTER_WRITE_DELAY);

                /* Leave DFE/FFE on */
                if (is_a0())
                        writel(0x3F09983F, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_rx_ssc_control0);
                else if (is_a2())
                        writel(0x3F11103F, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_rx_ssc_control0);
                else {
                        writel(0x3F11103F, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_rx_ssc_control0);
                        udelay(AFE_REGISTER_WRITE_DELAY);
                        /* Enable TX equalization (0xe824) */
                        writel(0x00040000, &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_control);
                }
                udelay(AFE_REGISTER_WRITE_DELAY);

                writel(oem_phy->afe_tx_amp_control0,
                        &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_amp_control0);
                udelay(AFE_REGISTER_WRITE_DELAY);

                writel(oem_phy->afe_tx_amp_control1,
                        &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_amp_control1);
                udelay(AFE_REGISTER_WRITE_DELAY);

                writel(oem_phy->afe_tx_amp_control2,
                        &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_amp_control2);
                udelay(AFE_REGISTER_WRITE_DELAY);

                writel(oem_phy->afe_tx_amp_control3,
                        &scic->scu_registers->afe.scu_afe_xcvr[phy_id].afe_tx_amp_control3);
                udelay(AFE_REGISTER_WRITE_DELAY);
        }

        /* Transfer control to the PEs */
        writel(0x00010f00, &scic->scu_registers->afe.afe_dfx_master_control0);
        udelay(AFE_REGISTER_WRITE_DELAY);
}

static enum sci_status scic_controller_set_mode(struct scic_sds_controller *scic,
                                                enum sci_controller_mode operating_mode)
{
        enum sci_status status          = SCI_SUCCESS;

        if ((scic->state_machine.current_state_id ==
                                SCI_BASE_CONTROLLER_STATE_INITIALIZING) ||
            (scic->state_machine.current_state_id ==
                                SCI_BASE_CONTROLLER_STATE_INITIALIZED)) {
                switch (operating_mode) {
                case SCI_MODE_SPEED:
                        scic->remote_node_entries      = SCI_MAX_REMOTE_DEVICES;
                        scic->task_context_entries     = SCU_IO_REQUEST_COUNT;
                        scic->uf_control.buffers.count =
                                SCU_UNSOLICITED_FRAME_COUNT;
                        scic->completion_event_entries = SCU_EVENT_COUNT;
                        scic->completion_queue_entries =
                                SCU_COMPLETION_QUEUE_COUNT;
                        break;

                case SCI_MODE_SIZE:
                        scic->remote_node_entries      = SCI_MIN_REMOTE_DEVICES;
                        scic->task_context_entries     = SCI_MIN_IO_REQUESTS;
                        scic->uf_control.buffers.count =
                                SCU_MIN_UNSOLICITED_FRAMES;
                        scic->completion_event_entries = SCU_MIN_EVENTS;
                        scic->completion_queue_entries =
                                SCU_MIN_COMPLETION_QUEUE_ENTRIES;
                        break;

                default:
                        status = SCI_FAILURE_INVALID_PARAMETER_VALUE;
                        break;
                }
        } else
                status = SCI_FAILURE_INVALID_STATE;

        return status;
}

static void scic_sds_controller_initialize_power_control(struct scic_sds_controller *scic)
{
        struct isci_host *ihost = scic_to_ihost(scic);
        scic->power_control.timer = isci_timer_create(ihost,
                                                      scic,
                                        scic_sds_controller_power_control_timer_handler);

        memset(scic->power_control.requesters, 0,
               sizeof(scic->power_control.requesters));

        scic->power_control.phys_waiting = 0;
        scic->power_control.phys_granted_power = 0;
}

static enum sci_status scic_controller_initialize(struct scic_sds_controller *scic)
{
        struct sci_base_state_machine *sm = &scic->state_machine;
        enum sci_status result = SCI_SUCCESS;
        struct isci_host *ihost = scic_to_ihost(scic);
        u32 index, state;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_RESET) {
                dev_warn(scic_to_dev(scic),
                         "SCIC Controller initialize operation requested "
                         "in invalid state\n");
                return SCI_FAILURE_INVALID_STATE;
        }

        sci_base_state_machine_change_state(sm, SCI_BASE_CONTROLLER_STATE_INITIALIZING);

        scic->timeout_timer = isci_timer_create(ihost, scic,
                                                scic_sds_controller_timeout_handler);

        scic_sds_controller_initialize_phy_startup(scic);

        scic_sds_controller_initialize_power_control(scic);

        /*
         * There is nothing to do here for B0 since we do not have to
         * program the AFE registers.
         * / @todo The AFE settings are supposed to be correct for the B0 but
         * /       presently they seem to be wrong. */
        scic_sds_controller_afe_initialization(scic);

        if (result == SCI_SUCCESS) {
                u32 status;
                u32 terminate_loop;

                /* Take the hardware out of reset */
                writel(0, &scic->smu_registers->soft_reset_control);

                /*
                 * / @todo Provide meaningfull error code for hardware failure
                 * result = SCI_FAILURE_CONTROLLER_HARDWARE; */
                result = SCI_FAILURE;
                terminate_loop = 100;

                while (terminate_loop-- && (result != SCI_SUCCESS)) {
                        /* Loop until the hardware reports success */
                        udelay(SCU_CONTEXT_RAM_INIT_STALL_TIME);
                        status = readl(&scic->smu_registers->control_status);

                        if ((status & SCU_RAM_INIT_COMPLETED) ==
                                        SCU_RAM_INIT_COMPLETED)
                                result = SCI_SUCCESS;
                }
        }

        if (result == SCI_SUCCESS) {
                u32 max_supported_ports;
                u32 max_supported_devices;
                u32 max_supported_io_requests;
                u32 device_context_capacity;

                /*
                 * Determine what are the actaul device capacities that the
                 * hardware will support */
                device_context_capacity =
                        readl(&scic->smu_registers->device_context_capacity);


                max_supported_ports = smu_dcc_get_max_ports(device_context_capacity);
                max_supported_devices = smu_dcc_get_max_remote_node_context(device_context_capacity);
                max_supported_io_requests = smu_dcc_get_max_task_context(device_context_capacity);

                /*
                 * Make all PEs that are unassigned match up with the
                 * logical ports
                 */
                for (index = 0; index < max_supported_ports; index++) {
                        struct scu_port_task_scheduler_group_registers __iomem
                                *ptsg = &scic->scu_registers->peg0.ptsg;

                        writel(index, &ptsg->protocol_engine[index]);
                }

                /* Record the smaller of the two capacity values */
                scic->logical_port_entries =
                        min(max_supported_ports, scic->logical_port_entries);

                scic->task_context_entries =
                        min(max_supported_io_requests,
                            scic->task_context_entries);

                scic->remote_node_entries =
                        min(max_supported_devices, scic->remote_node_entries);

                /*
                 * Now that we have the correct hardware reported minimum values
                 * build the MDL for the controller.  Default to a performance
                 * configuration.
                 */
                scic_controller_set_mode(scic, SCI_MODE_SPEED);
        }

        /* Initialize hardware PCI Relaxed ordering in DMA engines */
        if (result == SCI_SUCCESS) {
                u32 dma_configuration;

                /* Configure the payload DMA */
                dma_configuration =
                        readl(&scic->scu_registers->sdma.pdma_configuration);
                dma_configuration |=
                        SCU_PDMACR_GEN_BIT(PCI_RELAXED_ORDERING_ENABLE);
                writel(dma_configuration,
                        &scic->scu_registers->sdma.pdma_configuration);

                /* Configure the control DMA */
                dma_configuration =
                        readl(&scic->scu_registers->sdma.cdma_configuration);
                dma_configuration |=
                        SCU_CDMACR_GEN_BIT(PCI_RELAXED_ORDERING_ENABLE);
                writel(dma_configuration,
                        &scic->scu_registers->sdma.cdma_configuration);
        }

        /*
         * Initialize the PHYs before the PORTs because the PHY registers
         * are accessed during the port initialization.
         */
        if (result == SCI_SUCCESS) {
                /* Initialize the phys */
                for (index = 0;
                     (result == SCI_SUCCESS) && (index < SCI_MAX_PHYS);
                     index++) {
                        result = scic_sds_phy_initialize(
                                &ihost->phys[index].sci,
                                &scic->scu_registers->peg0.pe[index].tl,
                                &scic->scu_registers->peg0.pe[index].ll);
                }
        }

        if (result == SCI_SUCCESS) {
                /* Initialize the logical ports */
                for (index = 0;
                     (index < scic->logical_port_entries) &&
                     (result == SCI_SUCCESS);
                     index++) {
                        result = scic_sds_port_initialize(
                                &ihost->ports[index].sci,
                                &scic->scu_registers->peg0.ptsg.port[index],
                                &scic->scu_registers->peg0.ptsg.protocol_engine,
                                &scic->scu_registers->peg0.viit[index]);
                }
        }

        if (result == SCI_SUCCESS)
                result = scic_sds_port_configuration_agent_initialize(
                                scic,
                                &scic->port_agent);

        /* Advance the controller state machine */
        if (result == SCI_SUCCESS)
                state = SCI_BASE_CONTROLLER_STATE_INITIALIZED;
        else
                state = SCI_BASE_CONTROLLER_STATE_FAILED;
        sci_base_state_machine_change_state(sm, state);

        return result;
}

static enum sci_status scic_user_parameters_set(
        struct scic_sds_controller *scic,
        union scic_user_parameters *scic_parms)
{
        u32 state = scic->state_machine.current_state_id;

        if (state == SCI_BASE_CONTROLLER_STATE_RESET ||
            state == SCI_BASE_CONTROLLER_STATE_INITIALIZING ||
            state == SCI_BASE_CONTROLLER_STATE_INITIALIZED) {
                u16 index;

                /*
                 * Validate the user parameters.  If they are not legal, then
                 * return a failure.
                 */
                for (index = 0; index < SCI_MAX_PHYS; index++) {
                        struct sci_phy_user_params *user_phy;

                        user_phy = &scic_parms->sds1.phys[index];

                        if (!((user_phy->max_speed_generation <=
                                                SCIC_SDS_PARM_MAX_SPEED) &&
                              (user_phy->max_speed_generation >
                                                SCIC_SDS_PARM_NO_SPEED)))
                                return SCI_FAILURE_INVALID_PARAMETER_VALUE;

                        if (user_phy->in_connection_align_insertion_frequency <
                                        3)
                                return SCI_FAILURE_INVALID_PARAMETER_VALUE;

                        if ((user_phy->in_connection_align_insertion_frequency <
                                                3) ||
                            (user_phy->align_insertion_frequency == 0) ||
                            (user_phy->
                                notify_enable_spin_up_insertion_frequency ==
                                                0))
                                return SCI_FAILURE_INVALID_PARAMETER_VALUE;
                }

                if ((scic_parms->sds1.stp_inactivity_timeout == 0) ||
                    (scic_parms->sds1.ssp_inactivity_timeout == 0) ||
                    (scic_parms->sds1.stp_max_occupancy_timeout == 0) ||
                    (scic_parms->sds1.ssp_max_occupancy_timeout == 0) ||
                    (scic_parms->sds1.no_outbound_task_timeout == 0))
                        return SCI_FAILURE_INVALID_PARAMETER_VALUE;

                memcpy(&scic->user_parameters, scic_parms, sizeof(*scic_parms));

                return SCI_SUCCESS;
        }

        return SCI_FAILURE_INVALID_STATE;
}

static int scic_controller_mem_init(struct scic_sds_controller *scic)
{
        struct device *dev = scic_to_dev(scic);
        dma_addr_t dma_handle;
        enum sci_status result;

        scic->completion_queue = dmam_alloc_coherent(dev,
                        scic->completion_queue_entries * sizeof(u32),
                        &dma_handle, GFP_KERNEL);
        if (!scic->completion_queue)
                return -ENOMEM;

        writel(lower_32_bits(dma_handle),
                &scic->smu_registers->completion_queue_lower);
        writel(upper_32_bits(dma_handle),
                &scic->smu_registers->completion_queue_upper);

        scic->remote_node_context_table = dmam_alloc_coherent(dev,
                        scic->remote_node_entries *
                                sizeof(union scu_remote_node_context),
                        &dma_handle, GFP_KERNEL);
        if (!scic->remote_node_context_table)
                return -ENOMEM;

        writel(lower_32_bits(dma_handle),
                &scic->smu_registers->remote_node_context_lower);
        writel(upper_32_bits(dma_handle),
                &scic->smu_registers->remote_node_context_upper);

        scic->task_context_table = dmam_alloc_coherent(dev,
                        scic->task_context_entries *
                                sizeof(struct scu_task_context),
                        &dma_handle, GFP_KERNEL);
        if (!scic->task_context_table)
                return -ENOMEM;

        writel(lower_32_bits(dma_handle),
                &scic->smu_registers->host_task_table_lower);
        writel(upper_32_bits(dma_handle),
                &scic->smu_registers->host_task_table_upper);

        result = scic_sds_unsolicited_frame_control_construct(scic);
        if (result)
                return result;

        /*
         * Inform the silicon as to the location of the UF headers and
         * address table.
         */
        writel(lower_32_bits(scic->uf_control.headers.physical_address),
                &scic->scu_registers->sdma.uf_header_base_address_lower);
        writel(upper_32_bits(scic->uf_control.headers.physical_address),
                &scic->scu_registers->sdma.uf_header_base_address_upper);

        writel(lower_32_bits(scic->uf_control.address_table.physical_address),
                &scic->scu_registers->sdma.uf_address_table_lower);
        writel(upper_32_bits(scic->uf_control.address_table.physical_address),
                &scic->scu_registers->sdma.uf_address_table_upper);

        return 0;
}

int isci_host_init(struct isci_host *isci_host)
{
        int err = 0, i;
        enum sci_status status;
        union scic_oem_parameters oem;
        union scic_user_parameters scic_user_params;
        struct isci_pci_info *pci_info = to_pci_info(isci_host->pdev);

        isci_timer_list_construct(isci_host);

        spin_lock_init(&isci_host->state_lock);
        spin_lock_init(&isci_host->scic_lock);
        spin_lock_init(&isci_host->queue_lock);
        init_waitqueue_head(&isci_host->eventq);

        isci_host_change_state(isci_host, isci_starting);
        isci_host->can_queue = ISCI_CAN_QUEUE_VAL;

        status = scic_controller_construct(&isci_host->sci, scu_base(isci_host),
                                           smu_base(isci_host));

        if (status != SCI_SUCCESS) {
                dev_err(&isci_host->pdev->dev,
                        "%s: scic_controller_construct failed - status = %x\n",
                        __func__,
                        status);
                return -ENODEV;
        }

        isci_host->sas_ha.dev = &isci_host->pdev->dev;
        isci_host->sas_ha.lldd_ha = isci_host;

        /*
         * grab initial values stored in the controller object for OEM and USER
         * parameters
         */
        isci_user_parameters_get(isci_host, &scic_user_params);
        status = scic_user_parameters_set(&isci_host->sci,
                                          &scic_user_params);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                         "%s: scic_user_parameters_set failed\n",
                         __func__);
                return -ENODEV;
        }

        scic_oem_parameters_get(&isci_host->sci, &oem);

        /* grab any OEM parameters specified in orom */
        if (pci_info->orom) {
                status = isci_parse_oem_parameters(&oem,
                                                   pci_info->orom,
                                                   isci_host->id);
                if (status != SCI_SUCCESS) {
                        dev_warn(&isci_host->pdev->dev,
                                 "parsing firmware oem parameters failed\n");
                        return -EINVAL;
                }
        }

        status = scic_oem_parameters_set(&isci_host->sci, &oem);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                                "%s: scic_oem_parameters_set failed\n",
                                __func__);
                return -ENODEV;
        }

        tasklet_init(&isci_host->completion_tasklet,
                     isci_host_completion_routine, (unsigned long)isci_host);

        INIT_LIST_HEAD(&isci_host->requests_to_complete);
        INIT_LIST_HEAD(&isci_host->requests_to_errorback);

        spin_lock_irq(&isci_host->scic_lock);
        status = scic_controller_initialize(&isci_host->sci);
        spin_unlock_irq(&isci_host->scic_lock);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                         "%s: scic_controller_initialize failed -"
                         " status = 0x%x\n",
                         __func__, status);
                return -ENODEV;
        }

        err = scic_controller_mem_init(&isci_host->sci);
        if (err)
                return err;

        isci_host->dma_pool = dmam_pool_create(DRV_NAME, &isci_host->pdev->dev,
                                               sizeof(struct isci_request),
                                               SLAB_HWCACHE_ALIGN, 0);

        if (!isci_host->dma_pool)
                return -ENOMEM;

        for (i = 0; i < SCI_MAX_PORTS; i++)
                isci_port_init(&isci_host->ports[i], isci_host, i);

        for (i = 0; i < SCI_MAX_PHYS; i++)
                isci_phy_init(&isci_host->phys[i], isci_host, i);

        for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
                struct isci_remote_device *idev = &isci_host->devices[i];

                INIT_LIST_HEAD(&idev->reqs_in_process);
                INIT_LIST_HEAD(&idev->node);
                spin_lock_init(&idev->state_lock);
        }

        return 0;
}

void scic_sds_controller_link_up(struct scic_sds_controller *scic,
                struct scic_sds_port *port, struct scic_sds_phy *phy)
{
        switch (scic->state_machine.current_state_id) {
        case SCI_BASE_CONTROLLER_STATE_STARTING:
                scic_sds_controller_phy_timer_stop(scic);
                scic->port_agent.link_up_handler(scic, &scic->port_agent,
                                                 port, phy);
                scic_sds_controller_start_next_phy(scic);
                break;
        case SCI_BASE_CONTROLLER_STATE_READY:
                scic->port_agent.link_up_handler(scic, &scic->port_agent,
                                                 port, phy);
                break;
        default:
                dev_dbg(scic_to_dev(scic),
                        "%s: SCIC Controller linkup event from phy %d in "
                        "unexpected state %d\n", __func__, phy->phy_index,
                        scic->state_machine.current_state_id);
        }
}

void scic_sds_controller_link_down(struct scic_sds_controller *scic,
                struct scic_sds_port *port, struct scic_sds_phy *phy)
{
        switch (scic->state_machine.current_state_id) {
        case SCI_BASE_CONTROLLER_STATE_STARTING:
        case SCI_BASE_CONTROLLER_STATE_READY:
                scic->port_agent.link_down_handler(scic, &scic->port_agent,
                                                   port, phy);
                break;
        default:
                dev_dbg(scic_to_dev(scic),
                        "%s: SCIC Controller linkdown event from phy %d in "
                        "unexpected state %d\n",
                        __func__,
                        phy->phy_index,
                        scic->state_machine.current_state_id);
        }
}

/**
 * This is a helper method to determine if any remote devices on this
 * controller are still in the stopping state.
 *
 */
static bool scic_sds_controller_has_remote_devices_stopping(
        struct scic_sds_controller *controller)
{
        u32 index;

        for (index = 0; index < controller->remote_node_entries; index++) {
                if ((controller->device_table[index] != NULL) &&
                   (controller->device_table[index]->state_machine.current_state_id
                    == SCI_BASE_REMOTE_DEVICE_STATE_STOPPING))
                        return true;
        }

        return false;
}

/**
 * This method is called by the remote device to inform the controller
 * object that the remote device has stopped.
 */
void scic_sds_controller_remote_device_stopped(struct scic_sds_controller *scic,
                                               struct scic_sds_remote_device *sci_dev)
{
        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_STOPPING) {
                dev_dbg(scic_to_dev(scic),
                        "SCIC Controller 0x%p remote device stopped event "
                        "from device 0x%p in unexpected state %d\n",
                        scic, sci_dev,
                        scic->state_machine.current_state_id);
                return;
        }

        if (!scic_sds_controller_has_remote_devices_stopping(scic)) {
                sci_base_state_machine_change_state(&scic->state_machine,
                                SCI_BASE_CONTROLLER_STATE_STOPPED);
        }
}

/**
 * This method will write to the SCU PCP register the request value. The method
 *    is used to suspend/resume ports, devices, and phys.
 * @scic:
 *
 *
 */
void scic_sds_controller_post_request(
        struct scic_sds_controller *scic,
        u32 request)
{
        dev_dbg(scic_to_dev(scic),
                "%s: SCIC Controller 0x%p post request 0x%08x\n",
                __func__,
                scic,
                request);

        writel(request, &scic->smu_registers->post_context_port);
}

/**
 * This method will copy the soft copy of the task context into the physical
 *    memory accessible by the controller.
 * @scic: This parameter specifies the controller for which to copy
 *    the task context.
 * @sci_req: This parameter specifies the request for which the task
 *    context is being copied.
 *
 * After this call is made the SCIC_SDS_IO_REQUEST object will always point to
 * the physical memory version of the task context. Thus, all subsequent
 * updates to the task context are performed in the TC table (i.e. DMAable
 * memory). none
 */
void scic_sds_controller_copy_task_context(
        struct scic_sds_controller *scic,
        struct scic_sds_request *sci_req)
{
        struct scu_task_context *task_context_buffer;

        task_context_buffer = scic_sds_controller_get_task_context_buffer(
                scic, sci_req->io_tag);

        memcpy(task_context_buffer,
               sci_req->task_context_buffer,
               offsetof(struct scu_task_context, sgl_snapshot_ac));

        /*
         * Now that the soft copy of the TC has been copied into the TC
         * table accessible by the silicon.  Thus, any further changes to
         * the TC (e.g. TC termination) occur in the appropriate location. */
        sci_req->task_context_buffer = task_context_buffer;
}

/**
 * This method returns the task context buffer for the given io tag.
 * @scic:
 * @io_tag:
 *
 * struct scu_task_context*
 */
struct scu_task_context *scic_sds_controller_get_task_context_buffer(
        struct scic_sds_controller *scic,
        u16 io_tag
        ) {
        u16 task_index = scic_sds_io_tag_get_index(io_tag);

        if (task_index < scic->task_context_entries) {
                return &scic->task_context_table[task_index];
        }

        return NULL;
}

struct scic_sds_request *scic_request_by_tag(struct scic_sds_controller *scic,
                                             u16 io_tag)
{
        u16 task_index;
        u16 task_sequence;

        task_index = scic_sds_io_tag_get_index(io_tag);

        if (task_index  < scic->task_context_entries) {
                if (scic->io_request_table[task_index] != NULL) {
                        task_sequence = scic_sds_io_tag_get_sequence(io_tag);

                        if (task_sequence == scic->io_request_sequence[task_index]) {
                                return scic->io_request_table[task_index];
                        }
                }
        }

        return NULL;
}

/**
 * This method allocates remote node index and the reserves the remote node
 *    context space for use. This method can fail if there are no more remote
 *    node index available.
 * @scic: This is the controller object which contains the set of
 *    free remote node ids
 * @sci_dev: This is the device object which is requesting the a remote node
 *    id
 * @node_id: This is the remote node id that is assinged to the device if one
 *    is available
 *
 * enum sci_status SCI_FAILURE_OUT_OF_RESOURCES if there are no available remote
 * node index available.
 */
enum sci_status scic_sds_controller_allocate_remote_node_context(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *sci_dev,
        u16 *node_id)
{
        u16 node_index;
        u32 remote_node_count = scic_sds_remote_device_node_count(sci_dev);

        node_index = scic_sds_remote_node_table_allocate_remote_node(
                &scic->available_remote_nodes, remote_node_count
                );

        if (node_index != SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) {
                scic->device_table[node_index] = sci_dev;

                *node_id = node_index;

                return SCI_SUCCESS;
        }

        return SCI_FAILURE_INSUFFICIENT_RESOURCES;
}

/**
 * This method frees the remote node index back to the available pool.  Once
 *    this is done the remote node context buffer is no longer valid and can
 *    not be used.
 * @scic:
 * @sci_dev:
 * @node_id:
 *
 */
void scic_sds_controller_free_remote_node_context(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *sci_dev,
        u16 node_id)
{
        u32 remote_node_count = scic_sds_remote_device_node_count(sci_dev);

        if (scic->device_table[node_id] == sci_dev) {
                scic->device_table[node_id] = NULL;

                scic_sds_remote_node_table_release_remote_node_index(
                        &scic->available_remote_nodes, remote_node_count, node_id
                        );
        }
}

/**
 * This method returns the union scu_remote_node_context for the specified remote
 *    node id.
 * @scic:
 * @node_id:
 *
 * union scu_remote_node_context*
 */
union scu_remote_node_context *scic_sds_controller_get_remote_node_context_buffer(
        struct scic_sds_controller *scic,
        u16 node_id
        ) {
        if (
                (node_id < scic->remote_node_entries)
                && (scic->device_table[node_id] != NULL)
                ) {
                return &scic->remote_node_context_table[node_id];
        }

        return NULL;
}

/**
 *
 * @resposne_buffer: This is the buffer into which the D2H register FIS will be
 *    constructed.
 * @frame_header: This is the frame header returned by the hardware.
 * @frame_buffer: This is the frame buffer returned by the hardware.
 *
 * This method will combind the frame header and frame buffer to create a SATA
 * D2H register FIS none
 */
void scic_sds_controller_copy_sata_response(
        void *response_buffer,
        void *frame_header,
        void *frame_buffer)
{
        memcpy(response_buffer, frame_header, sizeof(u32));

        memcpy(response_buffer + sizeof(u32),
               frame_buffer,
               sizeof(struct dev_to_host_fis) - sizeof(u32));
}

/**
 * This method releases the frame once this is done the frame is available for
 *    re-use by the hardware.  The data contained in the frame header and frame
 *    buffer is no longer valid. The UF queue get pointer is only updated if UF
 *    control indicates this is appropriate.
 * @scic:
 * @frame_index:
 *
 */
void scic_sds_controller_release_frame(
        struct scic_sds_controller *scic,
        u32 frame_index)
{
        if (scic_sds_unsolicited_frame_control_release_frame(
                    &scic->uf_control, frame_index) == true)
                writel(scic->uf_control.get,
                        &scic->scu_registers->sdma.unsolicited_frame_get_pointer);
}

/**
 * scic_controller_start_io() - This method is called by the SCI user to
 *    send/start an IO request. If the method invocation is successful, then
 *    the IO request has been queued to the hardware for processing.
 * @controller: the handle to the controller object for which to start an IO
 *    request.
 * @remote_device: the handle to the remote device object for which to start an
 *    IO request.
 * @io_request: the handle to the io request object to start.
 * @io_tag: This parameter specifies a previously allocated IO tag that the
 *    user desires to be utilized for this request. This parameter is optional.
 *     The user is allowed to supply SCI_CONTROLLER_INVALID_IO_TAG as the value
 *    for this parameter.
 *
 * - IO tags are a protected resource.  It is incumbent upon the SCI Core user
 * to ensure that each of the methods that may allocate or free available IO
 * tags are handled in a mutually exclusive manner.  This method is one of said
 * methods requiring proper critical code section protection (e.g. semaphore,
 * spin-lock, etc.). - For SATA, the user is required to manage NCQ tags.  As a
 * result, it is expected the user will have set the NCQ tag field in the host
 * to device register FIS prior to calling this method.  There is also a
 * requirement for the user to call scic_stp_io_set_ncq_tag() prior to invoking
 * the scic_controller_start_io() method. scic_controller_allocate_tag() for
 * more information on allocating a tag. Indicate if the controller
 * successfully started the IO request. SCI_SUCCESS if the IO request was
 * successfully started. Determine the failure situations and return values.
 */
enum sci_status scic_controller_start_io(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *rdev,
        struct scic_sds_request *req,
        u16 io_tag)
{
        enum sci_status status;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_READY) {
                dev_warn(scic_to_dev(scic), "invalid state to start I/O");
                return SCI_FAILURE_INVALID_STATE;
        }

        status = scic_sds_remote_device_start_io(scic, rdev, req);
        if (status != SCI_SUCCESS)
                return status;

        scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;
        scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(req));
        return SCI_SUCCESS;
}

/**
 * scic_controller_terminate_request() - This method is called by the SCI Core
 *    user to terminate an ongoing (i.e. started) core IO request.  This does
 *    not abort the IO request at the target, but rather removes the IO request
 *    from the host controller.
 * @controller: the handle to the controller object for which to terminate a
 *    request.
 * @remote_device: the handle to the remote device object for which to
 *    terminate a request.
 * @request: the handle to the io or task management request object to
 *    terminate.
 *
 * Indicate if the controller successfully began the terminate process for the
 * IO request. SCI_SUCCESS if the terminate process was successfully started
 * for the request. Determine the failure situations and return values.
 */
enum sci_status scic_controller_terminate_request(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *rdev,
        struct scic_sds_request *req)
{
        enum sci_status status;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_READY) {
                dev_warn(scic_to_dev(scic),
                         "invalid state to terminate request\n");
                return SCI_FAILURE_INVALID_STATE;
        }

        status = scic_sds_io_request_terminate(req);
        if (status != SCI_SUCCESS)
                return status;

        /*
         * Utilize the original post context command and or in the POST_TC_ABORT
         * request sub-type.
         */
        scic_sds_controller_post_request(scic,
                scic_sds_request_get_post_context(req) |
                SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT);
        return SCI_SUCCESS;
}

/**
 * scic_controller_complete_io() - This method will perform core specific
 *    completion operations for an IO request.  After this method is invoked,
 *    the user should consider the IO request as invalid until it is properly
 *    reused (i.e. re-constructed).
 * @controller: The handle to the controller object for which to complete the
 *    IO request.
 * @remote_device: The handle to the remote device object for which to complete
 *    the IO request.
 * @io_request: the handle to the io request object to complete.
 *
 * - IO tags are a protected resource.  It is incumbent upon the SCI Core user
 * to ensure that each of the methods that may allocate or free available IO
 * tags are handled in a mutually exclusive manner.  This method is one of said
 * methods requiring proper critical code section protection (e.g. semaphore,
 * spin-lock, etc.). - If the IO tag for a request was allocated, by the SCI
 * Core user, using the scic_controller_allocate_io_tag() method, then it is
 * the responsibility of the caller to invoke the scic_controller_free_io_tag()
 * method to free the tag (i.e. this method will not free the IO tag). Indicate
 * if the controller successfully completed the IO request. SCI_SUCCESS if the
 * completion process was successful.
 */
enum sci_status scic_controller_complete_io(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *rdev,
        struct scic_sds_request *request)
{
        enum sci_status status;
        u16 index;

        switch (scic->state_machine.current_state_id) {
        case SCI_BASE_CONTROLLER_STATE_STOPPING:
                /* XXX: Implement this function */
                return SCI_FAILURE;
        case SCI_BASE_CONTROLLER_STATE_READY:
                status = scic_sds_remote_device_complete_io(scic, rdev, request);
                if (status != SCI_SUCCESS)
                        return status;

                index = scic_sds_io_tag_get_index(request->io_tag);
                scic->io_request_table[index] = NULL;
                return SCI_SUCCESS;
        default:
                dev_warn(scic_to_dev(scic), "invalid state to complete I/O");
                return SCI_FAILURE_INVALID_STATE;
        }

}

enum sci_status scic_controller_continue_io(struct scic_sds_request *sci_req)
{
        struct scic_sds_controller *scic = sci_req->owning_controller;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_READY) {
                dev_warn(scic_to_dev(scic), "invalid state to continue I/O");
                return SCI_FAILURE_INVALID_STATE;
        }

        scic->io_request_table[scic_sds_io_tag_get_index(sci_req->io_tag)] = sci_req;
        scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(sci_req));
        return SCI_SUCCESS;
}

/**
 * scic_controller_start_task() - This method is called by the SCIC user to
 *    send/start a framework task management request.
 * @controller: the handle to the controller object for which to start the task
 *    management request.
 * @remote_device: the handle to the remote device object for which to start
 *    the task management request.
 * @task_request: the handle to the task request object to start.
 * @io_tag: This parameter specifies a previously allocated IO tag that the
 *    user desires to be utilized for this request.  Note this not the io_tag
 *    of the request being managed.  It is to be utilized for the task request
 *    itself. This parameter is optional.  The user is allowed to supply
 *    SCI_CONTROLLER_INVALID_IO_TAG as the value for this parameter.
 *
 * - IO tags are a protected resource.  It is incumbent upon the SCI Core user
 * to ensure that each of the methods that may allocate or free available IO
 * tags are handled in a mutually exclusive manner.  This method is one of said
 * methods requiring proper critical code section protection (e.g. semaphore,
 * spin-lock, etc.). - The user must synchronize this task with completion
 * queue processing.  If they are not synchronized then it is possible for the
 * io requests that are being managed by the task request can complete before
 * starting the task request. scic_controller_allocate_tag() for more
 * information on allocating a tag. Indicate if the controller successfully
 * started the IO request. SCI_TASK_SUCCESS if the task request was
 * successfully started. SCI_TASK_FAILURE_REQUIRES_SCSI_ABORT This value is
 * returned if there is/are task(s) outstanding that require termination or
 * completion before this request can succeed.
 */
enum sci_task_status scic_controller_start_task(
        struct scic_sds_controller *scic,
        struct scic_sds_remote_device *rdev,
        struct scic_sds_request *req,
        u16 task_tag)
{
        enum sci_status status;

        if (scic->state_machine.current_state_id !=
            SCI_BASE_CONTROLLER_STATE_READY) {
                dev_warn(scic_to_dev(scic),
                         "%s: SCIC Controller starting task from invalid "
                         "state\n",
                         __func__);
                return SCI_TASK_FAILURE_INVALID_STATE;
        }

        status = scic_sds_remote_device_start_task(scic, rdev, req);
        switch (status) {
        case SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS:
                scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;

                /*
                 * We will let framework know this task request started successfully,
                 * although core is still woring on starting the request (to post tc when
                 * RNC is resumed.)
                 */
                return SCI_SUCCESS;
        case SCI_SUCCESS:
                scic->io_request_table[scic_sds_io_tag_get_index(req->io_tag)] = req;

                scic_sds_controller_post_request(scic,
                        scic_sds_request_get_post_context(req));
                break;
        default:
                break;
        }

        return status;
}

/**
 * scic_controller_allocate_io_tag() - This method will allocate a tag from the
 *    pool of free IO tags. Direct allocation of IO tags by the SCI Core user
 *    is optional. The scic_controller_start_io() method will allocate an IO
 *    tag if this method is not utilized and the tag is not supplied to the IO
 *    construct routine.  Direct allocation of IO tags may provide additional
 *    performance improvements in environments capable of supporting this usage
 *    model.  Additionally, direct allocation of IO tags also provides
 *    additional flexibility to the SCI Core user.  Specifically, the user may
 *    retain IO tags across the lives of multiple IO requests.
 * @controller: the handle to the controller object for which to allocate the
 *    tag.
 *
 * IO tags are a protected resource.  It is incumbent upon the SCI Core user to
 * ensure that each of the methods that may allocate or free available IO tags
 * are handled in a mutually exclusive manner.  This method is one of said
 * methods requiring proper critical code section protection (e.g. semaphore,
 * spin-lock, etc.). An unsigned integer representing an available IO tag.
 * SCI_CONTROLLER_INVALID_IO_TAG This value is returned if there are no
 * currently available tags to be allocated. All return other values indicate a
 * legitimate tag.
 */
u16 scic_controller_allocate_io_tag(
        struct scic_sds_controller *scic)
{
        u16 task_context;
        u16 sequence_count;

        if (!sci_pool_empty(scic->tci_pool)) {
                sci_pool_get(scic->tci_pool, task_context);

                sequence_count = scic->io_request_sequence[task_context];

                return scic_sds_io_tag_construct(sequence_count, task_context);
        }

        return SCI_CONTROLLER_INVALID_IO_TAG;
}

/**
 * scic_controller_free_io_tag() - This method will free an IO tag to the pool
 *    of free IO tags. This method provides the SCI Core user more flexibility
 *    with regards to IO tags.  The user may desire to keep an IO tag after an
 *    IO request has completed, because they plan on re-using the tag for a
 *    subsequent IO request.  This method is only legal if the tag was
 *    allocated via scic_controller_allocate_io_tag().
 * @controller: This parameter specifies the handle to the controller object
 *    for which to free/return the tag.
 * @io_tag: This parameter represents the tag to be freed to the pool of
 *    available tags.
 *
 * - IO tags are a protected resource.  It is incumbent upon the SCI Core user
 * to ensure that each of the methods that may allocate or free available IO
 * tags are handled in a mutually exclusive manner.  This method is one of said
 * methods requiring proper critical code section protection (e.g. semaphore,
 * spin-lock, etc.). - If the IO tag for a request was allocated, by the SCI
 * Core user, using the scic_controller_allocate_io_tag() method, then it is
 * the responsibility of the caller to invoke this method to free the tag. This
 * method returns an indication of whether the tag was successfully put back
 * (freed) to the pool of available tags. SCI_SUCCESS This return value
 * indicates the tag was successfully placed into the pool of available IO
 * tags. SCI_FAILURE_INVALID_IO_TAG This value is returned if the supplied tag
 * is not a valid IO tag value.
 */
enum sci_status scic_controller_free_io_tag(
        struct scic_sds_controller *scic,
        u16 io_tag)
{
        u16 sequence;
        u16 index;

        BUG_ON(io_tag == SCI_CONTROLLER_INVALID_IO_TAG);

        sequence = scic_sds_io_tag_get_sequence(io_tag);
        index    = scic_sds_io_tag_get_index(io_tag);

        if (!sci_pool_full(scic->tci_pool)) {
                if (sequence == scic->io_request_sequence[index]) {
                        scic_sds_io_sequence_increment(
                                scic->io_request_sequence[index]);

                        sci_pool_put(scic->tci_pool, index);

                        return SCI_SUCCESS;
                }
        }

        return SCI_FAILURE_INVALID_IO_TAG;
}