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

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 *

     3

 *  $Id$

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 *

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 *  Copyright (C) 2006  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

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 *  and/or modify it under the terms of the GNU General Public License

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 *  as published by the Free Software Foundation; either version 2 of the

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 *  License, or (at your option) any later version.

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 *

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

    15

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

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

    19

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

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 *  along 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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 *  The right to use EtherCAT Technology is granted and comes free of

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 *  charge under condition of compatibility of product made by

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 *  Licensee. People intending to distribute/sell products based on the

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 *  code, have to sign an agreement to guarantee that products using

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 *  software based on IgH EtherCAT master stay compatible with the actual

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 *  EtherCAT specification (which are released themselves as an open

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 *  standard) as the (only) precondition to have the right to use EtherCAT

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 *  Technology, IP and trade marks.

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 *

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

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    34

/** \file

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 * EtherCAT master state machine.

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 */

    37

    38

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

    39

    40

#include "globals.h"

    41

#include "master.h"

    42

#include "mailbox.h"

    43

#include "slave_config.h"

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#ifdef EC_EOE

    45

#include "ethernet.h"

    46

#endif

    47

    48

#include "fsm_master.h"

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    50

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

    51

    52

void ec_fsm_master_state_start(ec_fsm_master_t *);

    53

void ec_fsm_master_state_broadcast(ec_fsm_master_t *);

    54

void ec_fsm_master_state_read_state(ec_fsm_master_t *);

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void ec_fsm_master_state_acknowledge(ec_fsm_master_t *);

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void ec_fsm_master_state_configure_slave(ec_fsm_master_t *);

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void ec_fsm_master_state_clear_addresses(ec_fsm_master_t *);

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void ec_fsm_master_state_scan_slave(ec_fsm_master_t *);

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void ec_fsm_master_state_write_sii(ec_fsm_master_t *);

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void ec_fsm_master_state_sdo_dictionary(ec_fsm_master_t *);

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void ec_fsm_master_state_sdo_request(ec_fsm_master_t *);

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void ec_fsm_master_state_end(ec_fsm_master_t *);

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void ec_fsm_master_state_error(ec_fsm_master_t *);

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    65

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

    66

    67

/** Constructor.

    68

 */

    69

void ec_fsm_master_init(

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        ec_fsm_master_t *fsm, /**< Master state machine. */

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        ec_master_t *master, /**< EtherCAT master. */

    72

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

    73

        )

    74

{

    75

    fsm->master = master;

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    fsm->datagram = datagram;

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    fsm->state = ec_fsm_master_state_start;

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    fsm->idle = 0;

    79

    fsm->slaves_responding = 0;

    80

    fsm->topology_change_pending = 0;

    81

    fsm->slave_states = EC_SLAVE_STATE_UNKNOWN;

    82

    83

    // init sub-state-machines

    84

    ec_fsm_slave_config_init(&fsm->fsm_slave_config, fsm->datagram);

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    ec_fsm_slave_scan_init(&fsm->fsm_slave_scan, fsm->datagram,

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            &fsm->fsm_slave_config, &fsm->fsm_coe_map);

    87

    ec_fsm_sii_init(&fsm->fsm_sii, fsm->datagram);

    88

    ec_fsm_change_init(&fsm->fsm_change, fsm->datagram);

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

    90

    ec_fsm_coe_map_init(&fsm->fsm_coe_map, &fsm->fsm_coe);

    91

}

    92

    93

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

    94

    95

/** Destructor.

    96

 */

    97

void ec_fsm_master_clear(

    98

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

    99

        )

   100

{

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    // clear sub-state machines

   102

    ec_fsm_slave_config_clear(&fsm->fsm_slave_config);

   103

    ec_fsm_slave_scan_clear(&fsm->fsm_slave_scan);

   104

    ec_fsm_sii_clear(&fsm->fsm_sii);

   105

    ec_fsm_change_clear(&fsm->fsm_change);

   106

    ec_fsm_coe_clear(&fsm->fsm_coe);

   107

    ec_fsm_coe_map_clear(&fsm->fsm_coe_map);

   108

}

   109

   110

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

   111

   112

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

   113

 *

   114

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

   115

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

   116

 *

   117

 * \return false, if state machine has terminated

   118

 */

   119

int ec_fsm_master_exec(

   120

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

   121

        )

   122

{

   123

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

   124

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

   125

        // datagram was not sent or received yet.

   126

        return ec_fsm_master_running(fsm);

   127

    }

   128

   129

    fsm->state(fsm);

   130

    return ec_fsm_master_running(fsm);

   131

}

   132

   133

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

   134

   135

/**

   136

 * \return false, if state machine has terminated

   137

 */

   138

int ec_fsm_master_running(

   139

        const ec_fsm_master_t *fsm /**< Master state machine. */

   140

        )

   141

{

   142

    return fsm->state != ec_fsm_master_state_end

   143

        && fsm->state != ec_fsm_master_state_error;

   144

}

   145

   146

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

   147

   148

/**

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 * \return true, if the state machine is in an idle phase

   150

 */

   151

int ec_fsm_master_idle(

   152

        const ec_fsm_master_t *fsm /**< Master state machine. */

   153

        )

   154

{

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    return fsm->idle;

   156

}

   157

   158

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

   159

 * Master state machine

   160

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

   161

   162

/** Master state: START.

   163

 *

   164

 * Starts with getting slave count and slave states.

   165

 */

   166

void ec_fsm_master_state_start(

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

   168

        )

   169

{

   170

    fsm->idle = 1;

   171

    ec_datagram_brd(fsm->datagram, 0x0130, 2);

   172

    fsm->state = ec_fsm_master_state_broadcast;

   173

}

   174

   175

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

   176

   177

/** Master state: BROADCAST.

   178

 *

   179

 * Processes the broadcast read slave count and slaves states.

   180

 */

   181

void ec_fsm_master_state_broadcast(

   182

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

   183

        )

   184

{

   185

    ec_datagram_t *datagram = fsm->datagram;

   186

    unsigned int i;

   187

    ec_slave_t *slave;

   188

    ec_master_t *master = fsm->master;

   189

   190

    if (datagram->state == EC_DATAGRAM_TIMED_OUT)

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        return; // always retry

   192

   193

    // bus topology change?

   194

    if (datagram->working_counter != fsm->slaves_responding) {

   195

        fsm->topology_change_pending = 1;

   196

        fsm->slaves_responding = datagram->working_counter;

   197

        EC_INFO("%u slave(s) responding.\n", fsm->slaves_responding);

   198

    }

   199

   200

    if (datagram->state != EC_DATAGRAM_RECEIVED) { // link is down

   201

        fsm->state = ec_fsm_master_state_error;

   202

        return;

   203

    }

   204

   205

    // slave states changed?

   206

    if (EC_READ_U8(datagram->data) != fsm->slave_states) {

   207

        char states[EC_STATE_STRING_SIZE];

   208

        fsm->slave_states = EC_READ_U8(datagram->data);

   209

        ec_state_string(fsm->slave_states, states);

   210

        EC_INFO("Slave states: %s.\n", states);

   211

    }

   212

   213

    if (fsm->topology_change_pending) {

   214

        down(&master->scan_sem);

   215

        if (!master->allow_scan) {

   216

            up(&master->scan_sem);

   217

        } else {

   218

            master->scan_busy = 1;

   219

            up(&master->scan_sem);

   220

   221

            // topology change when scan is allowed:

   222

            // clear all slaves and scan the bus

   223

            fsm->topology_change_pending = 0;

   224

            fsm->idle = 0;

   225

            fsm->scan_jiffies = jiffies;

   226

   227

#ifdef EC_EOE

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            ec_master_eoe_stop(master);

   229

            ec_master_clear_eoe_handlers(master);

   230

#endif

   231

            ec_master_destroy_slaves(master);

   232

            master->configs_attached = 0;

   233

   234

            master->slave_count = datagram->working_counter;

   235

   236

            if (!master->slave_count) {

   237

                // no slaves present -> finish state machine.

   238

                master->scan_busy = 0;

   239

                wake_up_interruptible(&master->scan_queue);

   240

                fsm->state = ec_fsm_master_state_end;

   241

                return;

   242

            }

   243

   244

            // init slaves

   245

            for (i = 0; i < master->slave_count; i++) {

   246

                if (!(slave = (ec_slave_t *) kmalloc(sizeof(ec_slave_t),

   247

                                GFP_ATOMIC))) {

   248

                    EC_ERR("Failed to allocate slave %i!\n", i);

   249

                    ec_master_destroy_slaves(master);

   250

                    master->scan_busy = 0;

   251

                    wake_up_interruptible(&master->scan_queue);

   252

                    fsm->state = ec_fsm_master_state_error;

   253

                    return;

   254

                }

   255

   256

                if (ec_slave_init(slave, master, i, i + 1)) {

   257

                    // freeing of "slave" already done

   258

                    ec_master_destroy_slaves(master);

   259

                    master->scan_busy = 0;

   260

                    wake_up_interruptible(&master->scan_queue);

   261

                    fsm->state = ec_fsm_master_state_error;

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                    return;

   263

                }

   264

   265

                // do not force reconfiguration in operation mode to avoid

   266

                // unnecesssary process data interruptions

   267

                if (master->mode != EC_MASTER_MODE_OPERATION)

   268

                    slave->force_config = 1;

   269

   270

                list_add_tail(&slave->list, &master->slaves);

   271

            }

   272

   273

            // broadcast clear all station addresses

   274

            ec_datagram_bwr(datagram, 0x0010, 2);

   275

            EC_WRITE_U16(datagram->data, 0x0000);

   276

            fsm->retries = EC_FSM_RETRIES;

   277

            fsm->state = ec_fsm_master_state_clear_addresses;

   278

            return;

   279

        }

   280

    }

   281

   282

    if (list_empty(&master->slaves)) {

   283

        fsm->state = ec_fsm_master_state_end;

   284

    } else {

   285

        // fetch state from first slave

   286

        fsm->slave = list_entry(master->slaves.next, ec_slave_t, list);

   287

        ec_datagram_fprd(fsm->datagram, fsm->slave->station_address,

   288

                0x0130, 2);

   289

        fsm->retries = EC_FSM_RETRIES;

   290

        fsm->state = ec_fsm_master_state_read_state;

   291

    }

   292

}

   293

   294

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

   295

   296

/** Check for pending SII write requests and process one.

   297

 * 

   298

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

   299

 */

   300

int ec_fsm_master_action_process_sii(

   301

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

   302

        )

   303

{

   304

    ec_master_t *master = fsm->master;

   305

    ec_sii_write_request_t *request;

   306

   307

    // search the first request to be processed

   308

    while (1) {

   309

        down(&master->sii_sem);

   310

        if (list_empty(&master->sii_requests)) {

   311

            up(&master->sii_sem);

   312

            break;

   313

        }

   314

        // get first request

   315

        request = list_entry(master->sii_requests.next,

   316

                ec_sii_write_request_t, list);

   317

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

   318

        request->state = EC_REQUEST_BUSY;

   319

        up(&master->sii_sem);

   320

   321

        // found pending SII write operation. execute it!

   322

        if (master->debug_level)

   323

            EC_DBG("Writing SII data to slave %u...\n",

   324

                    request->slave->ring_position);

   325

        fsm->sii_request = request;

   326

        fsm->sii_index = 0;

   327

        ec_fsm_sii_write(&fsm->fsm_sii, request->slave, request->word_offset,

   328

                request->data, EC_FSM_SII_USE_CONFIGURED_ADDRESS);

   329

        fsm->state = ec_fsm_master_state_write_sii;

   330

        fsm->state(fsm); // execute immediately

   331

        return 1;

   332

    }

   333

   334

    return 0;

   335

}

   336

   337

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

   338

   339

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

   340

 * 

   341

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

   342

 */

   343

int ec_fsm_master_action_process_sdo(

   344

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

   345

        )

   346

{

   347

    ec_master_t *master = fsm->master;

   348

    ec_master_sdo_request_t *request;

   349

    ec_sdo_request_t *req;

   350

    ec_slave_t *slave;

   351

   352

    // search for internal requests to be processed

   353

    list_for_each_entry(slave, &master->slaves, list) {

   354

        if (!slave->config)

   355

            continue;

   356

        list_for_each_entry(req, &slave->config->sdo_requests, list) {

   357

            if (req->state == EC_REQUEST_QUEUED) {

   358

   359

                if (ec_sdo_request_timed_out(req)) {

   360

                    req->state = EC_REQUEST_FAILURE;

   361

                    if (master->debug_level)

   362

                        EC_DBG("Sdo request for slave %u timed out...\n",

   363

                                slave->ring_position);

   364

                    continue;

   365

                }

   366

   367

                if (slave->current_state == EC_SLAVE_STATE_INIT ||

   368

                        slave->error_flag) {

   369

                    req->state = EC_REQUEST_FAILURE;

   370

                    continue;

   371

                }

   372

   373

                req->state = EC_REQUEST_BUSY;

   374

                if (master->debug_level)

   375

                    EC_DBG("Processing Sdo request for slave %u...\n",

   376

                            slave->ring_position);

   377

   378

                fsm->idle = 0;

   379

                fsm->sdo_request = req;

   380

                fsm->slave = slave;

   381

                fsm->state = ec_fsm_master_state_sdo_request;

   382

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

   383

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

   384

                return 1;

   385

            }

   386

        }

   387

    }

   388

   389

    // search the first external request to be processed

   390

    while (1) {

   391

        down(&master->sdo_sem);

   392

        if (list_empty(&master->slave_sdo_requests)) {

   393

            up(&master->sdo_sem);

   394

            break;

   395

        }

   396

        // get first request

   397

        request = list_entry(master->slave_sdo_requests.next,

   398

                ec_master_sdo_request_t, list);

   399

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

   400

        request->req.state = EC_REQUEST_BUSY;

   401

        up(&master->sdo_sem);

   402

   403

        slave = request->slave;

   404

        if (slave->current_state == EC_SLAVE_STATE_INIT) {

   405

            EC_ERR("Discarding Sdo request, slave %u is in INIT.\n",

   406

                    slave->ring_position);

   407

            request->req.state = EC_REQUEST_FAILURE;

   408

            wake_up(&master->sdo_queue);

   409

            continue;

   410

        }

   411

   412

        // Found pending Sdo request. Execute it!

   413

        if (master->debug_level)

   414

            EC_DBG("Processing Sdo request for slave %u...\n",

   415

                    slave->ring_position);

   416

   417

        // Start uploading Sdo

   418

        fsm->idle = 0;

   419

        fsm->sdo_request = &request->req;

   420

        fsm->slave = slave;

   421

        fsm->state = ec_fsm_master_state_sdo_request;

   422

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

   423

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

   424

        return 1;

   425

    }

   426

   427

    return 0;

   428

}

   429

   430

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

   431

   432

/** Master action: IDLE.

   433

 *

   434

 * Does secondary work.

   435

 */

   436

void ec_fsm_master_action_idle(

   437

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

   438

        )

   439

{

   440

    ec_master_t *master = fsm->master;

   441

    ec_slave_t *slave;

   442

   443

    // Check for pending Sdo requests

   444

    if (ec_fsm_master_action_process_sdo(fsm))

   445

        return;

   446

   447

    // check, if slaves have an Sdo dictionary to read out.

   448

    list_for_each_entry(slave, &master->slaves, list) {

   449

        if (!(slave->sii.mailbox_protocols & EC_MBOX_COE)

   450

                || slave->sdo_dictionary_fetched

   451

                || slave->current_state == EC_SLAVE_STATE_INIT

   452

                || jiffies - slave->jiffies_preop < EC_WAIT_SDO_DICT * HZ

   453

                || slave->error_flag) continue;

   454

   455

        if (master->debug_level) {

   456

            EC_DBG("Fetching Sdo dictionary from slave %u.\n",

   457

                    slave->ring_position);

   458

        }

   459

   460

        slave->sdo_dictionary_fetched = 1;

   461

   462

        // start fetching Sdo dictionary

   463

        fsm->idle = 0;

   464

        fsm->slave = slave;

   465

        fsm->state = ec_fsm_master_state_sdo_dictionary;

   466

        ec_fsm_coe_dictionary(&fsm->fsm_coe, slave);

   467

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

   468

        return;

   469

    }

   470

   471

    // check for pending SII write operations.

   472

    if (ec_fsm_master_action_process_sii(fsm))

   473

        return; // SII write request found

   474

   475

    fsm->state = ec_fsm_master_state_end;

   476

}

   477

   478

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

   479

   480

/** Master action: Get state of next slave.

   481

 */

   482

void ec_fsm_master_action_next_slave_state(

   483

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

   484

        )

   485

{

   486

    ec_master_t *master = fsm->master;

   487

    ec_slave_t *slave = fsm->slave;