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/******************************************************************************

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT Master.

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 *

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 *  The IgH EtherCAT Master is free software; you can redistribute it and/or

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 *  modify it under the terms of the GNU General Public License version 2, as

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 *  published by the Free Software Foundation.

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 *

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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

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 *  Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License along

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 *  with the IgH EtherCAT Master; if not, write to the Free Software

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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 *

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 *  ---

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 *

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 *  The license mentioned above concerns the source code only. Using the

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 *  EtherCAT technology and brand is only permitted in compliance with the

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 *  industrial property and similar rights of Beckhoff Automation GmbH.

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 *

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 *****************************************************************************/

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/** \file

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 * EtherCAT slave (SDO) state machine.

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 */

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/*****************************************************************************/

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#include "globals.h"

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#include "master.h"

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#include "mailbox.h"

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#include "fsm_slave.h"

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/*****************************************************************************/

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void ec_fsm_slave_state_idle(ec_fsm_slave_t *);

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void ec_fsm_slave_state_ready(ec_fsm_slave_t *);

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int ec_fsm_slave_action_process_sdo(ec_fsm_slave_t *);

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void ec_fsm_slave_state_sdo_request(ec_fsm_slave_t *);

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int ec_fsm_slave_action_process_foe(ec_fsm_slave_t *);

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void ec_fsm_slave_state_foe_request(ec_fsm_slave_t *);

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int ec_fsm_slave_action_process_soe(ec_fsm_slave_t *);

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void ec_fsm_slave_state_soe_request(ec_fsm_slave_t *);

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/*****************************************************************************/

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/** Constructor.

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 */

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void ec_fsm_slave_init(

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        ec_fsm_slave_t *fsm, /**< Slave state machine. */

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        ec_slave_t *slave, /**< EtherCAT slave. */

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        ec_datagram_t *datagram /**< Datagram object to use. */

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        )

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{

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    fsm->slave = slave;

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    fsm->datagram = datagram;

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    fsm->datagram->data_size = 0;

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    EC_SLAVE_DBG(slave, 1, "Init FSM.\n");

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    fsm->state = ec_fsm_slave_state_idle;

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    // init sub-state-machines

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    ec_fsm_coe_init(&fsm->fsm_coe, fsm->datagram);

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    ec_fsm_foe_init(&fsm->fsm_foe, fsm->datagram);

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    ec_fsm_soe_init(&fsm->fsm_soe, fsm->datagram);

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}

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/*****************************************************************************/

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/** Destructor.

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 */

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void ec_fsm_slave_clear(

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        ec_fsm_slave_t *fsm /**< Master state machine. */

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        )

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{

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    // clear sub-state machines

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    ec_fsm_coe_clear(&fsm->fsm_coe);

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    ec_fsm_foe_clear(&fsm->fsm_foe);

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    ec_fsm_soe_clear(&fsm->fsm_soe);

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}

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/*****************************************************************************/

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/** Executes the current state of the state machine.

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 *

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 * If the state machine's datagram is not sent or received yet, the execution

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 * of the state machine is delayed to the next cycle.

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 *

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 * \return true, if the state machine was executed

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 */

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int ec_fsm_slave_exec(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    if (fsm->datagram->state == EC_DATAGRAM_SENT

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        || fsm->datagram->state == EC_DATAGRAM_QUEUED) {

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        // datagram was not sent or received yet.

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        return 0;

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    }

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    fsm->state(fsm);

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    return 1;

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}

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/*****************************************************************************/

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/** Sets the current state of the state machine to READY

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 */

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void ec_fsm_slave_ready(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    if (fsm->state == ec_fsm_slave_state_idle) {

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        EC_SLAVE_DBG(fsm->slave, 1, "Ready for requests.\n");

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        fsm->state = ec_fsm_slave_state_ready;

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    }

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}

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/******************************************************************************

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 * Slave state machine

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 *****************************************************************************/

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/** Slave state: IDLE.

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 */

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void ec_fsm_slave_state_idle(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    // do nothing

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}

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/*****************************************************************************/

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/** Slave state: READY.

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 */

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void ec_fsm_slave_state_ready(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    // Check for pending external SDO requests

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    if (ec_fsm_slave_action_process_sdo(fsm))

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        return;

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    // Check for pending FoE requests

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    if (ec_fsm_slave_action_process_foe(fsm))

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        return;

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    // Check for pending SoE requests

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    if (ec_fsm_slave_action_process_soe(fsm))

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        return;

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}

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/*****************************************************************************/

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/** Check for pending SDO requests and process one.

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 *

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 * \return non-zero, if an SDO request is processed.

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 */

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int ec_fsm_slave_action_process_sdo(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_master_sdo_request_t *request, *next;

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    // search the first external request to be processed

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    list_for_each_entry_safe(request, next, &slave->slave_sdo_requests, list) {

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        list_del_init(&request->list); // dequeue

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        if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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            EC_SLAVE_WARN(slave, "Aborting SDO request %p,"

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                    " slave has error flag set.\n",request);

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            request->req.state = EC_INT_REQUEST_FAILURE;

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            kref_put(&request->refcount,ec_master_sdo_request_release);

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            wake_up(&slave->sdo_queue);

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            fsm->sdo_request = NULL;

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            fsm->state = ec_fsm_slave_state_idle;

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            return 0;

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        }

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        if (slave->current_state == EC_SLAVE_STATE_INIT) {

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            EC_SLAVE_WARN(slave, "Aborting SDO request %p, slave is in INIT.\n",request);

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            request->req.state = EC_INT_REQUEST_FAILURE;

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            kref_put(&request->refcount,ec_master_sdo_request_release);

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            wake_up(&slave->sdo_queue);

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            fsm->sdo_request = NULL;

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            fsm->state = ec_fsm_slave_state_idle;

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            return 0;

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        }

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        request->req.state = EC_INT_REQUEST_BUSY;

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        // Found pending SDO request. Execute it!

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        EC_SLAVE_DBG(slave, 1, "Processing SDO request %p...\n",request);

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        // Start SDO transfer

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        fsm->sdo_request = request;

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        fsm->state = ec_fsm_slave_state_sdo_request;

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        ec_fsm_coe_transfer(&fsm->fsm_coe, slave, &request->req);

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        ec_fsm_coe_exec(&fsm->fsm_coe); // execute immediately

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        ec_master_queue_request_fsm_datagram(fsm->slave->master,fsm->datagram);

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        return 1;

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    }

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    return 0;

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}

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/*****************************************************************************/

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/** Slave state: SDO_REQUEST.

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 */

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void ec_fsm_slave_state_sdo_request(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_master_sdo_request_t *request = fsm->sdo_request;

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    if (ec_fsm_coe_exec(&fsm->fsm_coe))

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    {

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        ec_master_queue_request_fsm_datagram(fsm->slave->master,fsm->datagram);

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        return;

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    }

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    if (!ec_fsm_coe_success(&fsm->fsm_coe)) {

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        EC_SLAVE_ERR(slave, "Failed to process SDO request %p.\n",request);

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        request->req.state = EC_INT_REQUEST_FAILURE;

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        kref_put(&request->refcount,ec_master_sdo_request_release);

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        wake_up(&slave->sdo_queue);

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        fsm->sdo_request = NULL;

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        fsm->state = ec_fsm_slave_state_idle;

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        return;

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    }

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    EC_SLAVE_DBG(slave, 1, "Finished SDO request %p.\n",request);

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    // SDO request finished

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    request->req.state = EC_INT_REQUEST_SUCCESS;

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    kref_put(&request->refcount,ec_master_sdo_request_release);

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    wake_up(&slave->sdo_queue);

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    fsm->sdo_request = NULL;

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    fsm->state = ec_fsm_slave_state_ready;

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}

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/*****************************************************************************/

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/** Check for pending FOE requests and process one.

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 *

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 * \return non-zero, if an FOE request is processed.

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 */

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int ec_fsm_slave_action_process_foe(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_master_foe_request_t *request, *next;

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    // search the first request to be processed

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    list_for_each_entry_safe(request, next, &slave->foe_requests, list) {

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        if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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            EC_SLAVE_WARN(slave, "Aborting FOE request,"

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                    " slave has error flag set.\n");

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            request->req.state = EC_INT_REQUEST_FAILURE;

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            wake_up(&slave->foe_queue);

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            fsm->sdo_request = NULL;

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            fsm->state = ec_fsm_slave_state_idle;

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            return 0;

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        }

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        list_del_init(&request->list); // dequeue

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        request->req.state = EC_INT_REQUEST_BUSY;

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        EC_SLAVE_DBG(slave, 1, "Processing FoE request.\n");

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        fsm->foe_request = &request->req;

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        fsm->state = ec_fsm_slave_state_foe_request;

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        ec_fsm_foe_transfer(&fsm->fsm_foe, slave, &request->req);

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        ec_fsm_foe_exec(&fsm->fsm_foe);

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        ec_master_queue_request_fsm_datagram(fsm->slave->master,fsm->datagram);

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        return 1;

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    }

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    return 0;

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}

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/*****************************************************************************/

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/** Slave state: FOE REQUEST.

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 */

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void ec_fsm_slave_state_foe_request(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_foe_request_t *request = fsm->foe_request;

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    if (ec_fsm_foe_exec(&fsm->fsm_foe))

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    {

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        ec_master_queue_request_fsm_datagram(fsm->slave->master,fsm->datagram);

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        return;

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    }

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    if (!ec_fsm_foe_success(&fsm->fsm_foe)) {

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        EC_SLAVE_ERR(slave, "Failed to handle FoE request.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

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        wake_up(&slave->foe_queue);

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        fsm->foe_request = NULL;

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        fsm->state = ec_fsm_slave_state_idle;

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        return;

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    }

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    // finished transferring FoE

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    EC_SLAVE_DBG(slave, 1, "Successfully transferred %zu bytes of FoE"

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            " data.\n", request->data_size);

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    request->state = EC_INT_REQUEST_SUCCESS;

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    wake_up(&slave->foe_queue);

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    fsm->foe_request = NULL;

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    fsm->state = ec_fsm_slave_state_ready;

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}

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/*****************************************************************************/

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/** Check for pending SoE requests and process one.

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 *

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 * \return non-zero, if a request is processed.

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 */

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int ec_fsm_slave_action_process_soe(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

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        )

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{

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    ec_slave_t *slave = fsm->slave;

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    ec_master_soe_request_t *req, *next;

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    // search the first request to be processed

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    list_for_each_entry_safe(req, next, &slave->soe_requests, list) {

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        list_del_init(&req->list); // dequeue

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        if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {

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            EC_SLAVE_WARN(slave, "Aborting SoE request,"

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                    " slave has error flag set.\n");

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            req->req.state = EC_INT_REQUEST_FAILURE;

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            wake_up(&slave->soe_queue);

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            fsm->state = ec_fsm_slave_state_idle;

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            return 0;

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        }

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        if (slave->current_state == EC_SLAVE_STATE_INIT) {

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            EC_SLAVE_WARN(slave, "Aborting SoE request, slave is in INIT.\n");

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            req->req.state = EC_INT_REQUEST_FAILURE;

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            wake_up(&slave->soe_queue);

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            fsm->state = ec_fsm_slave_state_idle;

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            return 0;

   362

        }

   363

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        req->req.state = EC_INT_REQUEST_BUSY;

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        // Found pending request. Execute it!

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        EC_SLAVE_DBG(slave, 1, "Processing SoE request...\n");

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   369

        // Start SoE transfer

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        fsm->soe_request = &req->req;

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        fsm->state = ec_fsm_slave_state_soe_request;

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        ec_fsm_soe_transfer(&fsm->fsm_soe, slave, &req->req);

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        ec_fsm_soe_exec(&fsm->fsm_soe); // execute immediately

   374

        ec_master_queue_request_fsm_datagram(fsm->slave->master, fsm->datagram);

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        return 1;

   376

    }

   377

    return 0;

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}

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   380

/*****************************************************************************/

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/** Slave state: SOE_REQUEST.

   383

 */

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void ec_fsm_slave_state_soe_request(

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        ec_fsm_slave_t *fsm /**< Slave state machine. */

   386

        )

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{

   388

    ec_slave_t *slave = fsm->slave;

   389

    ec_soe_request_t *request = fsm->soe_request;

   390

   391

    if (ec_fsm_soe_exec(&fsm->fsm_soe)) {

   392

        ec_master_queue_request_fsm_datagram(fsm->slave->master, fsm->datagram);

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        return;

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    }

   395

   396

    if (!ec_fsm_soe_success(&fsm->fsm_soe)) {

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        EC_SLAVE_ERR(slave, "Failed to process SoE request.\n");

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        request->state = EC_INT_REQUEST_FAILURE;

   399

        wake_up(&slave->soe_queue);

   400

        fsm->soe_request = NULL;

   401

        fsm->state = ec_fsm_slave_state_idle;

   402

        return;

   403

    }

   404

   405

    EC_SLAVE_DBG(slave, 1, "Finished SoE request.\n");

   406

   407

    // SoE request finished

   408

    request->state = EC_INT_REQUEST_SUCCESS;

   409

    wake_up(&slave->soe_queue);

   410

   411

    fsm->soe_request = NULL;

   412

    fsm->state = ec_fsm_slave_state_ready;

   413

}

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/*****************************************************************************/