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

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006-2012  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT master userspace library.

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 *

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 *  The IgH EtherCAT master userspace library is free software; you can

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 *  redistribute it and/or modify it under the terms of the GNU Lesser General

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 *  Public License as published by the Free Software Foundation; version 2.1

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 *  of the License.

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 *

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 *  The IgH EtherCAT master userspace library is distributed in the hope that

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 *  it will be useful, but WITHOUT ANY WARRANTY; without even the implied

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 *  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU Lesser General Public License for more details.

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 *

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

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 *  along with the IgH EtherCAT master userspace library. If not, see

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 *  <http://www.gnu.org/licenses/>.

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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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 *

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 * EtherCAT master application interface.

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 *

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 * \defgroup ApplicationInterface EtherCAT Application Interface

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 *

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 * EtherCAT interface for realtime applications. This interface is designed

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 * for realtime modules that want to use EtherCAT. There are functions to

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 * request a master, to map process data, to communicate with slaves via CoE

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 * and to configure and activate the bus.

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 *

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 * Changes in version 1.5.2:

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 *

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 * - Added redundancy_active flag to ec_domain_state_t.

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 * - Added ecrt_master_link_state() method and ec_master_link_state_t to query

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 *   the state of a redundant link.

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 * - Added the EC_HAVE_REDUNDANCY define, to check, if the interface contains

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 *   redundancy features.

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 * - Added ecrt_sdo_request_index() to change SDO index and subindex after

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 *   handler creation.

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 * - Added interface for retrieving CoE emergency messages, i. e.

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 *   ecrt_slave_config_emerg_size(), ecrt_slave_config_emerg_pop(),

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 *   ecrt_slave_config_emerg_clear(), ecrt_slave_config_emerg_overruns() and

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 *   the defines EC_HAVE_EMERGENCY and EC_COE_EMERGENCY_MSG_SIZE.

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 * - Added interface for direct EtherCAT register access: Added data type

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 *   ec_reg_request_t and methods ecrt_slave_config_create_reg_request(),

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 *   ecrt_reg_request_data(), ecrt_reg_request_state(),

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 *   ecrt_reg_request_write(), ecrt_reg_request_read() and the feature flag

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 *   EC_HAVE_REG_ACCESS.

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 * - Added method to select the reference clock,

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 *   ecrt_master_select_reference_clock() and the feature flag

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 *   EC_HAVE_SELECT_REF_CLOCK to check, if the method is available.

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 * - Added method to get the reference clock time,

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 *   ecrt_master_reference_clock_time() and the feature flag

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 *   EC_HAVE_REF_CLOCK_TIME to have the possibility to synchronize the master

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 *   clock to the reference clock.

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 * - Changed the data types of the shift times in ecrt_slave_config_dc() to

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 *   int32_t to correctly display negative shift times.

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 * - Added ecrt_slave_config_reg_pdo_entry_pos() and the feature flag

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 *   EC_HAVE_REG_BY_POS for registering PDO entries with non-unique indices

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 *   via their positions in the mapping.

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 *

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 * Changes in version 1.5:

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 *

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 * - Added the distributed clocks feature and the respective method

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 *   ecrt_slave_config_dc() to configure a slave for cyclic operation, and

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 *   ecrt_master_application_time(), ecrt_master_sync_reference_clock() and

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 *   ecrt_master_sync_slave_clocks() for offset and drift compensation. The

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 *   EC_TIMEVAL2NANO() macro can be used for epoch time conversion, while the

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 *   ecrt_master_sync_monitor_queue() and ecrt_master_sync_monitor_process()

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 *   methods can be used to monitor the synchrony.

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 * - Improved the callback mechanism. ecrt_master_callbacks() now takes two

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 *   callback functions for sending and receiving datagrams.

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 *   ecrt_master_send_ext() is used to execute the sending of non-application

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 *   datagrams.

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 * - Added watchdog configuration (method ecrt_slave_config_watchdog(),

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 *   #ec_watchdog_mode_t, \a watchdog_mode parameter in ec_sync_info_t and

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 *   ecrt_slave_config_sync_manager()).

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 * - Added ecrt_slave_config_complete_sdo() method to download an SDO during

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 *   configuration via CompleteAccess.

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 * - Added ecrt_master_deactivate() to remove the bus configuration.

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 * - Added ecrt_open_master() and ecrt_master_reserve() separation for

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 *   userspace.

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 * - Added bus information interface (methods ecrt_master(),

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 *   ecrt_master_get_slave(), ecrt_master_get_sync_manager(),

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 *   ecrt_master_get_pdo() and ecrt_master_get_pdo_entry()) to get information

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 *   about the currently connected slaves and the PDO entries provided.

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 * - Added ecrt_master_sdo_download(), ecrt_master_sdo_download_complete() and

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 *   ecrt_master_sdo_upload() methods to let an application transfer SDOs

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 *   before activating the master.

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 * - Changed the meaning of the negative return values of

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 *   ecrt_slave_config_reg_pdo_entry() and ecrt_slave_config_sdo*().

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 * - Implemented the Vendor-specific over EtherCAT mailbox protocol. See

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 *   ecrt_slave_config_create_voe_handler().

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 * - Renamed ec_sdo_request_state_t to #ec_request_state_t, because it is also

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 *   used by VoE handlers.

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 * - Removed 'const' from argument of ecrt_sdo_request_state(), because the

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 *   userspace library has to modify object internals.

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 * - Added 64-bit data access macros.

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 * - Added ecrt_slave_config_idn() method for storing SoE IDN configurations,

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 *   and ecrt_master_read_idn() and ecrt_master_write_idn() to read/write IDNs

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 *   ad-hoc via the user-space library.

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 * - Added ecrt_master_reset() to initiate retrying to configure slaves.

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 *

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 * @{

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 */

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

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#ifndef __ECRT_H__

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#define __ECRT_H__

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#ifdef __KERNEL__

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#include <asm/byteorder.h>

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#include <linux/types.h>

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#include <linux/time.h>

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#else

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#include <stdlib.h> // for size_t

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#include <stdint.h>

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#include <sys/time.h> // for struct timeval

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#endif

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

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 * Global definitions

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

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/** EtherCAT realtime interface major version number.

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 */

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#define ECRT_VER_MAJOR 1

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/** EtherCAT realtime interface minor version number.

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 */

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#define ECRT_VER_MINOR 5

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/** EtherCAT realtime interface version word generator.

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 */

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#define ECRT_VERSION(a, b) (((a) << 8) + (b))

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/** EtherCAT realtime interface version word.

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 */

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#define ECRT_VERSION_MAGIC ECRT_VERSION(ECRT_VER_MAJOR, ECRT_VER_MINOR)

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

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 * Feature flags

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

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/** Defined, if the redundancy features are available.

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 *

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 * I. e. if the \a redundancy_active flag in ec_domain_state_t and the

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 * ecrt_master_link_state() method are available.

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 */

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#define EC_HAVE_REDUNDANCY

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/** Defined, if the CoE emergency ring feature is available.

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 *

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 * I. e. if the ecrt_slave_config_emerg_*() methods are available.

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 */

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#define EC_HAVE_EMERGENCY

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/** Defined, if the register access interface is available.

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 *

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 * I. e. if the methods ecrt_slave_config_create_reg_request(),

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 * ecrt_reg_request_data(), ecrt_reg_request_state(), ecrt_reg_request_write()

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 * and ecrt_reg_request_read() are available.

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 */

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#define EC_HAVE_REG_ACCESS

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/** Defined if the method ecrt_master_select_reference_clock() is available.

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 */

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#define EC_HAVE_SELECT_REF_CLOCK

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/** Defined if the method ecrt_master_reference_clock_time() is available.

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 */

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#define EC_HAVE_REF_CLOCK_TIME

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/** Defined if the method ecrt_slave_config_reg_pdo_entry_pos() is available.

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 */

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#define EC_HAVE_REG_BY_POS

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

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/** End of list marker.

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 *

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 * This can be used with ecrt_slave_config_pdos().

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 */

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#define EC_END ~0U

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/** Maximum number of sync managers per slave.

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 */

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#define EC_MAX_SYNC_MANAGERS 16

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/** Maximum string length.

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 *

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 * Used in ec_slave_info_t.

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 */

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#define EC_MAX_STRING_LENGTH 64

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/** Maximum number of slave ports. */

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#define EC_MAX_PORTS 4

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/** Timeval to nanoseconds conversion.

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 *

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 * This macro converts a Unix epoch time to EtherCAT DC time.

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 *

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 * \see void ecrt_master_application_time()

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 *

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 * \param TV struct timeval containing epoch time.

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 */

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#define EC_TIMEVAL2NANO(TV) \

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    (((TV).tv_sec - 946684800ULL) * 1000000000ULL + (TV).tv_usec * 1000ULL)

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/** Size of a CoE emergency message in byte.

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 *

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 * \see ecrt_slave_config_emerg_pop().

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 */

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#define EC_COE_EMERGENCY_MSG_SIZE 8

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

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 * Data types

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

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struct ec_master;

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typedef struct ec_master ec_master_t; /**< \see ec_master */

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struct ec_slave_config;

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typedef struct ec_slave_config ec_slave_config_t; /**< \see ec_slave_config */

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struct ec_domain;

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typedef struct ec_domain ec_domain_t; /**< \see ec_domain */

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struct ec_sdo_request;

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typedef struct ec_sdo_request ec_sdo_request_t; /**< \see ec_sdo_request. */

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struct ec_voe_handler;

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typedef struct ec_voe_handler ec_voe_handler_t; /**< \see ec_voe_handler. */

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struct ec_reg_request;

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typedef struct ec_reg_request ec_reg_request_t; /**< \see ec_sdo_request. */

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

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/** Master state.

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 *

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 * This is used for the output parameter of ecrt_master_state().

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 *

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 * \see ecrt_master_state().

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 */

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typedef struct {

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    unsigned int slaves_responding; /**< Sum of responding slaves on all

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                                      Ethernet devices. */

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    unsigned int al_states : 4; /**< Application-layer states of all slaves.

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                                  The states are coded in the lower 4 bits.

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                                  If a bit is set, it means that at least one

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                                  slave in the bus is in the corresponding

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                                  state:

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                                  - Bit 0: \a INIT

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                                  - Bit 1: \a PREOP

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                                  - Bit 2: \a SAFEOP

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                                  - Bit 3: \a OP */

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    unsigned int link_up : 1; /**< \a true, if at least one Ethernet link is

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                                up. */

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} ec_master_state_t;

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

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/** Redundant link state.

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 *

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 * This is used for the output parameter of ecrt_master_link_state().

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 *

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 * \see ecrt_master_link_state().

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 */

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typedef struct {

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    unsigned int slaves_responding; /**< Sum of responding slaves on the given

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                                      link. */

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    unsigned int al_states : 4; /**< Application-layer states of the slaves on

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                                  the given link.  The states are coded in the

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                                  lower 4 bits.  If a bit is set, it means

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                                  that at least one slave in the bus is in the

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                                  corresponding state:

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                                  - Bit 0: \a INIT

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                                  - Bit 1: \a PREOP

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                                  - Bit 2: \a SAFEOP

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                                  - Bit 3: \a OP */

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    unsigned int link_up : 1; /**< \a true, if the given Ethernet link is up.

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                               */

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} ec_master_link_state_t;

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

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/** Slave configuration state.

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 *

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 * This is used as an output parameter of ecrt_slave_config_state().

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 *

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 * \see ecrt_slave_config_state().

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 */

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typedef struct  {

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    unsigned int online : 1; /**< The slave is online. */

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    unsigned int operational : 1; /**< The slave was brought into \a OP state

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                                    using the specified configuration. */

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    unsigned int al_state : 4; /**< The application-layer state of the slave.

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                                 - 1: \a INIT

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                                 - 2: \a PREOP

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                                 - 4: \a SAFEOP

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                                 - 8: \a OP

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                                 Note that each state is coded in a different

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                                 bit! */

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} ec_slave_config_state_t;

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

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/** Master information.

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 *

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 * This is used as an output parameter of ecrt_master().

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 *

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 * \see ecrt_master().

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 */

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typedef struct {

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   unsigned int slave_count; /**< Number of slaves in the bus. */

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   unsigned int link_up : 1; /**< \a true, if the network link is up. */

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   uint8_t scan_busy; /**< \a true, while the master is scanning the bus */

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   uint64_t app_time; /**< Application time. */

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} ec_master_info_t;

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

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/** EtherCAT slave port descriptor.

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 */

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typedef enum {

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    EC_PORT_NOT_IMPLEMENTED, /**< Port is not implemented. */

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    EC_PORT_NOT_CONFIGURED, /**< Port is not configured. */

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    EC_PORT_EBUS, /**< Port is an E-Bus. */

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    EC_PORT_MII /**< Port is a MII. */

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} ec_slave_port_desc_t;

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

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/** EtherCAT slave port information.

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 */

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typedef struct {

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    uint8_t link_up; /**< Link detected. */

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    uint8_t loop_closed; /**< Loop closed. */

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    uint8_t signal_detected; /**< Detected signal on RX port. */

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} ec_slave_port_link_t;

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

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/** Slave information.

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 *

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 * This is used as an output parameter of ecrt_master_get_slave().

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 *

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 * \see ecrt_master_get_slave().

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 */

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typedef struct {

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    uint16_t position; /**< Offset of the slave in the ring. */

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    uint32_t vendor_id; /**< Vendor-ID stored on the slave. */

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    uint32_t product_code; /**< Product-Code stored on the slave. */

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    uint32_t revision_number; /**< Revision-Number stored on the slave. */

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    uint32_t serial_number; /**< Serial-Number stored on the slave. */

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    uint16_t alias; /**< The slaves alias if not equal to 0. */

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    int16_t current_on_ebus; /**< Used current in mA. */

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    struct {

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        ec_slave_port_desc_t desc; /**< Physical port type. */

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        ec_slave_port_link_t link; /**< Port link state. */

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        uint32_t receive_time; /**< Receive time on DC transmission delay

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                                 measurement. */

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        uint16_t next_slave; /**< Ring position of next DC slave on that

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                               port.  */

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        uint32_t delay_to_next_dc; /**< Delay [ns] to next DC slave. */

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    } ports[EC_MAX_PORTS]; /**< Port information. */

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    uint8_t al_state; /**< Current state of the slave. */

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    uint8_t error_flag; /**< Error flag for that slave. */

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    uint8_t sync_count; /**< Number of sync managers. */

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    uint16_t sdo_count; /**< Number of SDOs. */

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    char name[EC_MAX_STRING_LENGTH]; /**< Name of the slave. */

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} ec_slave_info_t;

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

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/** Domain working counter interpretation.

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 *

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 * This is used in ec_domain_state_t.

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 */

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typedef enum {

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    EC_WC_ZERO = 0,   /**< No registered process data were exchanged. */

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    EC_WC_INCOMPLETE, /**< Some of the registered process data were

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                        exchanged. */

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    EC_WC_COMPLETE    /**< All registered process data were exchanged. */

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} ec_wc_state_t;

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

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   403

/** Domain state.

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 *

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 * This is used for the output parameter of ecrt_domain_state().

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 */

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typedef struct {

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    unsigned int working_counter; /**< Value of the last working counter. */

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    ec_wc_state_t wc_state; /**< Working counter interpretation. */

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    unsigned int redundancy_active; /**< Redundant link is in use. */

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} ec_domain_state_t;

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

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/** Direction type for PDO assignment functions.

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 */

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typedef enum {

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    EC_DIR_INVALID, /**< Invalid direction. Do not use this value. */

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    EC_DIR_OUTPUT, /**< Values written by the master. */

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    EC_DIR_INPUT, /**< Values read by the master. */

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    EC_DIR_COUNT /**< Number of directions. For internal use only. */

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} ec_direction_t;

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

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/** Watchdog mode for sync manager configuration.

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 *

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 * Used to specify, if a sync manager's watchdog is to be enabled.

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 */

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typedef enum {

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    EC_WD_DEFAULT, /**< Use the default setting of the sync manager. */

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    EC_WD_ENABLE, /**< Enable the watchdog. */

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    EC_WD_DISABLE, /**< Disable the watchdog. */

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} ec_watchdog_mode_t;

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   436

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

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   438

/** PDO entry configuration information.

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 *

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 * This is the data type of the \a entries field in ec_pdo_info_t.

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 *

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 * \see ecrt_slave_config_pdos().

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 */

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typedef struct {

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    uint16_t index; /**< PDO entry index. */

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    uint8_t subindex; /**< PDO entry subindex. */

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    uint8_t bit_length; /**< Size of the PDO entry in bit. */

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} ec_pdo_entry_info_t;

   449

   450

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

   451

   452

/** PDO configuration information.

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 *

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 * This is the data type of the \a pdos field in ec_sync_info_t.

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 *

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 * \see ecrt_slave_config_pdos().

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 */

   458

typedef struct {

   459

    uint16_t index; /**< PDO index. */

   460

    unsigned int n_entries; /**< Number of PDO entries in \a entries to map.

   461

                              Zero means, that the default mapping shall be

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                              used (this can only be done if the slave is

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                              present at bus configuration time). */

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    ec_pdo_entry_info_t *entries; /**< Array of PDO entries to map. Can either

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                                    be \a NULL, or must contain at

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                                    least \a n_entries values. */

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} ec_pdo_info_t;

   468

   469

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

   470

   471

/** Sync manager configuration information.

   472

 *

   473

 * This can be use to configure multiple sync managers including the PDO

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 * assignment and PDO mapping. It is used as an input parameter type in

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 * ecrt_slave_config_pdos().

   476

 */

   477

typedef struct {

   478

    uint8_t index; /**< Sync manager index. Must be less

   479

                     than #EC_MAX_SYNC_MANAGERS for a valid sync manager,

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                     but can also be \a 0xff to mark the end of the list. */

   481

    ec_direction_t dir; /**< Sync manager direction. */

   482

    unsigned int n_pdos; /**< Number of PDOs in \a pdos. */

   483

    ec_pdo_info_t *pdos; /**< Array with PDOs to assign. This must contain

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                            at least \a n_pdos PDOs. */

   485

    ec_watchdog_mode_t watchdog_mode; /**< Watchdog mode. */