/****************************************************************************** * * $Id$ * * Copyright (C) 2006-2008 Florian Pose, Ingenieurgemeinschaft IgH * * This file is part of the IgH EtherCAT Master. * * The IgH EtherCAT Master is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2, as * published by the Free Software Foundation. * * The IgH EtherCAT Master is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. * * You should have received a copy of the GNU General Public License along * with the IgH EtherCAT Master; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * --- * * The license mentioned above concerns the source code only. Using the * EtherCAT technology and brand is only permitted in compliance with the * industrial property and similar rights of Beckhoff Automation GmbH. * * vim: expandtab * *****************************************************************************/ /** \file EtherCAT master methods. */ /*****************************************************************************/ #include #include #include #include #include #include #include #include #include "globals.h" #include "slave.h" #include "slave_config.h" #include "device.h" #include "datagram.h" #ifdef EC_EOE #include "ethernet.h" #endif #include "master.h" /*****************************************************************************/ /** Set to 1 to enable external datagram injection debugging. */ #define DEBUG_INJECT 0 #ifdef EC_HAVE_CYCLES /** Frame timeout in cycles. */ static cycles_t timeout_cycles; /** Timeout for external datagram injection [cycles]. */ static cycles_t ext_injection_timeout_cycles; #else /** Frame timeout in jiffies. */ static unsigned long timeout_jiffies; /** Timeout for external datagram injection [jiffies]. */ static unsigned long ext_injection_timeout_jiffies; #endif /*****************************************************************************/ void ec_master_clear_slave_configs(ec_master_t *); void ec_master_clear_domains(ec_master_t *); static int ec_master_idle_thread(void *); static int ec_master_operation_thread(void *); #ifdef EC_EOE static int ec_master_eoe_thread(void *); #endif void ec_master_find_dc_ref_clock(ec_master_t *); /*****************************************************************************/ /** Static variables initializer. */ void ec_master_init_static(void) { #ifdef EC_HAVE_CYCLES timeout_cycles = (cycles_t) EC_IO_TIMEOUT /* us */ * (cpu_khz / 1000); ext_injection_timeout_cycles = (cycles_t) EC_SDO_INJECTION_TIMEOUT /* us */ * (cpu_khz / 1000); #else // one jiffy may always elapse between time measurement timeout_jiffies = max(EC_IO_TIMEOUT * HZ / 1000000, 1); ext_injection_timeout_jiffies = max(EC_SDO_INJECTION_TIMEOUT * HZ / 1000000, 1); #endif } /*****************************************************************************/ /** Master constructor. \return 0 in case of success, else < 0 */ int ec_master_init(ec_master_t *master, /**< EtherCAT master */ unsigned int index, /**< master index */ const uint8_t *main_mac, /**< MAC address of main device */ const uint8_t *backup_mac, /**< MAC address of backup device */ dev_t device_number, /**< Character device number. */ struct class *class, /**< Device class. */ unsigned int debug_level /**< Debug level (module parameter). */ ) { int ret; master->index = index; master->reserved = 0; sema_init(&master->master_sem, 1); master->main_mac = main_mac; master->backup_mac = backup_mac; sema_init(&master->device_sem, 1); master->phase = EC_ORPHANED; master->active = 0; master->config_changed = 0; master->injection_seq_fsm = 0; master->injection_seq_rt = 0; master->slaves = NULL; master->slave_count = 0; INIT_LIST_HEAD(&master->configs); master->app_time = 0ULL; master->app_start_time = 0ULL; master->has_app_time = 0; master->scan_busy = 0; master->allow_scan = 1; sema_init(&master->scan_sem, 1); init_waitqueue_head(&master->scan_queue); master->config_busy = 0; master->allow_config = 1; sema_init(&master->config_sem, 1); init_waitqueue_head(&master->config_queue); INIT_LIST_HEAD(&master->datagram_queue); master->datagram_index = 0; INIT_LIST_HEAD(&master->ext_datagram_queue); sema_init(&master->ext_queue_sem, 1); INIT_LIST_HEAD(&master->external_datagram_queue); // send interval in IDLE phase ec_master_set_send_interval(master, 1000000 / HZ); INIT_LIST_HEAD(&master->domains); master->debug_level = debug_level; master->stats.timeouts = 0; master->stats.corrupted = 0; master->stats.unmatched = 0; master->stats.output_jiffies = 0; master->thread = NULL; #ifdef EC_EOE master->eoe_thread = NULL; INIT_LIST_HEAD(&master->eoe_handlers); #endif sema_init(&master->io_sem, 1); master->send_cb = NULL; master->receive_cb = NULL; master->cb_data = NULL; master->app_send_cb = NULL; master->app_receive_cb = NULL; master->app_cb_data = NULL; INIT_LIST_HEAD(&master->sii_requests); init_waitqueue_head(&master->sii_queue); INIT_LIST_HEAD(&master->reg_requests); init_waitqueue_head(&master->reg_queue); // init devices ret = ec_device_init(&master->main_device, master); if (ret < 0) goto out_return; ret = ec_device_init(&master->backup_device, master); if (ret < 0) goto out_clear_main; // init state machine datagram ec_datagram_init(&master->fsm_datagram); snprintf(master->fsm_datagram.name, EC_DATAGRAM_NAME_SIZE, "master-fsm"); ret = ec_datagram_prealloc(&master->fsm_datagram, EC_MAX_DATA_SIZE); if (ret < 0) { ec_datagram_clear(&master->fsm_datagram); EC_MASTER_ERR(master, "Failed to allocate FSM datagram.\n"); goto out_clear_backup; } // create state machine object ec_fsm_master_init(&master->fsm, master, &master->fsm_datagram); // init reference sync datagram ec_datagram_init(&master->ref_sync_datagram); snprintf(master->ref_sync_datagram.name, EC_DATAGRAM_NAME_SIZE, "refsync"); ret = ec_datagram_apwr(&master->ref_sync_datagram, 0, 0x0910, 8); if (ret < 0) { ec_datagram_clear(&master->ref_sync_datagram); EC_MASTER_ERR(master, "Failed to allocate reference" " synchronisation datagram.\n"); goto out_clear_fsm; } // init sync datagram ec_datagram_init(&master->sync_datagram); snprintf(master->sync_datagram.name, EC_DATAGRAM_NAME_SIZE, "sync"); ret = ec_datagram_prealloc(&master->sync_datagram, 4); if (ret < 0) { ec_datagram_clear(&master->sync_datagram); EC_MASTER_ERR(master, "Failed to allocate" " synchronisation datagram.\n"); goto out_clear_ref_sync; } // init sync monitor datagram ec_datagram_init(&master->sync_mon_datagram); snprintf(master->sync_mon_datagram.name, EC_DATAGRAM_NAME_SIZE, "syncmon"); ret = ec_datagram_brd(&master->sync_mon_datagram, 0x092c, 4); if (ret < 0) { ec_datagram_clear(&master->sync_mon_datagram); EC_MASTER_ERR(master, "Failed to allocate sync" " monitoring datagram.\n"); goto out_clear_sync; } ec_master_find_dc_ref_clock(master); // init character device ret = ec_cdev_init(&master->cdev, master, device_number); if (ret) goto out_clear_sync_mon; #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) master->class_device = device_create(class, NULL, MKDEV(MAJOR(device_number), master->index), NULL, "EtherCAT%u", master->index); #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26) master->class_device = device_create(class, NULL, MKDEV(MAJOR(device_number), master->index), "EtherCAT%u", master->index); #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 15) master->class_device = class_device_create(class, NULL, MKDEV(MAJOR(device_number), master->index), NULL, "EtherCAT%u", master->index); #else master->class_device = class_device_create(class, MKDEV(MAJOR(device_number), master->index), NULL, "EtherCAT%u", master->index); #endif if (IS_ERR(master->class_device)) { EC_MASTER_ERR(master, "Failed to create class device!\n"); ret = PTR_ERR(master->class_device); goto out_clear_cdev; } return 0; out_clear_cdev: ec_cdev_clear(&master->cdev); out_clear_sync_mon: ec_datagram_clear(&master->sync_mon_datagram); out_clear_sync: ec_datagram_clear(&master->sync_datagram); out_clear_ref_sync: ec_datagram_clear(&master->ref_sync_datagram); out_clear_fsm: ec_fsm_master_clear(&master->fsm); ec_datagram_clear(&master->fsm_datagram); out_clear_backup: ec_device_clear(&master->backup_device); out_clear_main: ec_device_clear(&master->main_device); out_return: return ret; } /*****************************************************************************/ /** Destructor. */ void ec_master_clear( ec_master_t *master /**< EtherCAT master */ ) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26) device_unregister(master->class_device); #else class_device_unregister(master->class_device); #endif ec_cdev_clear(&master->cdev); #ifdef EC_EOE ec_master_clear_eoe_handlers(master); #endif ec_master_clear_domains(master); ec_master_clear_slave_configs(master); ec_master_clear_slaves(master); ec_datagram_clear(&master->sync_mon_datagram); ec_datagram_clear(&master->sync_datagram); ec_datagram_clear(&master->ref_sync_datagram); ec_fsm_master_clear(&master->fsm); ec_datagram_clear(&master->fsm_datagram); ec_device_clear(&master->backup_device); ec_device_clear(&master->main_device); } /*****************************************************************************/ #ifdef EC_EOE /** Clear and free all EoE handlers. */ void ec_master_clear_eoe_handlers( ec_master_t *master /**< EtherCAT master */ ) { ec_eoe_t *eoe, *next; list_for_each_entry_safe(eoe, next, &master->eoe_handlers, list) { list_del(&eoe->list); ec_eoe_clear(eoe); kfree(eoe); } } #endif /*****************************************************************************/ /** Clear all slave configurations. */ void ec_master_clear_slave_configs(ec_master_t *master) { ec_slave_config_t *sc, *next; list_for_each_entry_safe(sc, next, &master->configs, list) { list_del(&sc->list); ec_slave_config_clear(sc); kfree(sc); } } /*****************************************************************************/ /** Clear all slaves. */ void ec_master_clear_slaves(ec_master_t *master) { ec_slave_t *slave; master->dc_ref_clock = NULL; // external requests are obsolete, so we wake pending waiters and remove // them from the list while (!list_empty(&master->sii_requests)) { ec_sii_write_request_t *request = list_entry(master->sii_requests.next, ec_sii_write_request_t, list); list_del_init(&request->list); // dequeue EC_MASTER_WARN(master, "Discarding SII request, slave %u about" " to be deleted.\n", request->slave->ring_position); request->state = EC_INT_REQUEST_FAILURE; wake_up(&master->sii_queue); } while (!list_empty(&master->reg_requests)) { ec_reg_request_t *request = list_entry(master->reg_requests.next, ec_reg_request_t, list); list_del_init(&request->list); // dequeue EC_MASTER_WARN(master, "Discarding register request, slave %u" " about to be deleted.\n", request->slave->ring_position); request->state = EC_INT_REQUEST_FAILURE; wake_up(&master->reg_queue); } for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { ec_slave_clear(slave); } if (master->slaves) { kfree(master->slaves); master->slaves = NULL; } master->slave_count = 0; } /*****************************************************************************/ /** Clear all domains. */ void ec_master_clear_domains(ec_master_t *master) { ec_domain_t *domain, *next; list_for_each_entry_safe(domain, next, &master->domains, list) { list_del(&domain->list); ec_domain_clear(domain); kfree(domain); } } /*****************************************************************************/ /** Clear the configuration applied by the application. */ void ec_master_clear_config( ec_master_t *master /**< EtherCAT master. */ ) { down(&master->master_sem); ec_master_clear_domains(master); ec_master_clear_slave_configs(master); up(&master->master_sem); } /*****************************************************************************/ /** Internal sending callback. */ void ec_master_internal_send_cb( void *cb_data /**< Callback data. */ ) { ec_master_t *master = (ec_master_t *) cb_data; down(&master->io_sem); ecrt_master_send_ext(master); up(&master->io_sem); } /*****************************************************************************/ /** Internal receiving callback. */ void ec_master_internal_receive_cb( void *cb_data /**< Callback data. */ ) { ec_master_t *master = (ec_master_t *) cb_data; down(&master->io_sem); ecrt_master_receive(master); up(&master->io_sem); } /*****************************************************************************/ /** Starts the master thread. * * \retval 0 Success. * \retval <0 Error code. */ int ec_master_thread_start( ec_master_t *master, /**< EtherCAT master */ int (*thread_func)(void *), /**< thread function to start */ const char *name /**< Thread name. */ ) { EC_MASTER_INFO(master, "Starting %s thread.\n", name); master->thread = kthread_run(thread_func, master, name); if (IS_ERR(master->thread)) { int err = (int) PTR_ERR(master->thread); EC_MASTER_ERR(master, "Failed to start master thread (error %i)!\n", err); master->thread = NULL; return err; } return 0; } /*****************************************************************************/ /** Stops the master thread. */ void ec_master_thread_stop( ec_master_t *master /**< EtherCAT master */ ) { unsigned long sleep_jiffies; if (!master->thread) { EC_MASTER_WARN(master, "%s(): Already finished!\n", __func__); return; } EC_MASTER_DBG(master, 1, "Stopping master thread.\n"); kthread_stop(master->thread); master->thread = NULL; EC_MASTER_INFO(master, "Master thread exited.\n"); if (master->fsm_datagram.state != EC_DATAGRAM_SENT) return; // wait for FSM datagram sleep_jiffies = max(HZ / 100, 1); // 10 ms, at least 1 jiffy schedule_timeout(sleep_jiffies); } /*****************************************************************************/ /** Transition function from ORPHANED to IDLE phase. */ int ec_master_enter_idle_phase( ec_master_t *master /**< EtherCAT master */ ) { int ret; EC_MASTER_DBG(master, 1, "ORPHANED -> IDLE.\n"); master->send_cb = ec_master_internal_send_cb; master->receive_cb = ec_master_internal_receive_cb; master->cb_data = master; master->phase = EC_IDLE; ret = ec_master_thread_start(master, ec_master_idle_thread, "EtherCAT-IDLE"); if (ret) master->phase = EC_ORPHANED; return ret; } /*****************************************************************************/ /** Transition function from IDLE to ORPHANED phase. */ void ec_master_leave_idle_phase(ec_master_t *master /**< EtherCAT master */) { EC_MASTER_DBG(master, 1, "IDLE -> ORPHANED.\n"); master->phase = EC_ORPHANED; #ifdef EC_EOE ec_master_eoe_stop(master); #endif ec_master_thread_stop(master); down(&master->master_sem); ec_master_clear_slaves(master); up(&master->master_sem); } /*****************************************************************************/ /** Transition function from IDLE to OPERATION phase. */ int ec_master_enter_operation_phase(ec_master_t *master /**< EtherCAT master */) { int ret = 0; ec_slave_t *slave; #ifdef EC_EOE ec_eoe_t *eoe; #endif EC_MASTER_DBG(master, 1, "IDLE -> OPERATION.\n"); down(&master->config_sem); master->allow_config = 0; // temporarily disable slave configuration if (master->config_busy) { up(&master->config_sem); // wait for slave configuration to complete ret = wait_event_interruptible(master->config_queue, !master->config_busy); if (ret) { EC_MASTER_INFO(master, "Finishing slave configuration" " interrupted by signal.\n"); goto out_allow; } EC_MASTER_DBG(master, 1, "Waiting for pending slave" " configuration returned.\n"); } else { up(&master->config_sem); } down(&master->scan_sem); master->allow_scan = 0; // 'lock' the slave list if (!master->scan_busy) { up(&master->scan_sem); } else { up(&master->scan_sem); // wait for slave scan to complete ret = wait_event_interruptible(master->scan_queue, !master->scan_busy); if (ret) { EC_MASTER_INFO(master, "Waiting for slave scan" " interrupted by signal.\n"); goto out_allow; } EC_MASTER_DBG(master, 1, "Waiting for pending" " slave scan returned.\n"); } // set states for all slaves for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { ec_slave_request_state(slave, EC_SLAVE_STATE_PREOP); } #ifdef EC_EOE // ... but set EoE slaves to OP list_for_each_entry(eoe, &master->eoe_handlers, list) { if (ec_eoe_is_open(eoe)) ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_OP); } #endif master->phase = EC_OPERATION; master->app_send_cb = NULL; master->app_receive_cb = NULL; master->app_cb_data = NULL; return ret; out_allow: master->allow_scan = 1; master->allow_config = 1; return ret; } /*****************************************************************************/ /** Transition function from OPERATION to IDLE phase. */ void ec_master_leave_operation_phase( ec_master_t *master /**< EtherCAT master */ ) { if (master->active) { ecrt_master_deactivate(master); // also clears config } else { ec_master_clear_config(master); } EC_MASTER_DBG(master, 1, "OPERATION -> IDLE.\n"); master->phase = EC_IDLE; } /*****************************************************************************/ /** Injects external datagrams that fit into the datagram queue. */ void ec_master_inject_external_datagrams( ec_master_t *master /**< EtherCAT master */ ) { ec_datagram_t *datagram, *n; size_t queue_size = 0; list_for_each_entry(datagram, &master->datagram_queue, queue) { queue_size += datagram->data_size; } list_for_each_entry_safe(datagram, n, &master->external_datagram_queue, queue) { queue_size += datagram->data_size; if (queue_size <= master->max_queue_size) { list_del_init(&datagram->queue); #if DEBUG_INJECT EC_MASTER_DBG(master, 0, "Injecting external datagram %08x" " size=%u, queue_size=%u\n", (unsigned int) datagram, datagram->data_size, queue_size); #endif #ifdef EC_HAVE_CYCLES datagram->cycles_sent = 0; #endif datagram->jiffies_sent = 0; ec_master_queue_datagram(master, datagram); } else { if (datagram->data_size > master->max_queue_size) { list_del_init(&datagram->queue); datagram->state = EC_DATAGRAM_ERROR; EC_MASTER_ERR(master, "External datagram %p is too large," " size=%zu, max_queue_size=%zu\n", datagram, datagram->data_size, master->max_queue_size); } else { #ifdef EC_HAVE_CYCLES cycles_t cycles_now = get_cycles(); if (cycles_now - datagram->cycles_sent > ext_injection_timeout_cycles) #else if (jiffies - datagram->jiffies_sent > ext_injection_timeout_jiffies) #endif { unsigned int time_us; list_del_init(&datagram->queue); datagram->state = EC_DATAGRAM_ERROR; #ifdef EC_HAVE_CYCLES time_us = (unsigned int) ((cycles_now - datagram->cycles_sent) * 1000LL) / cpu_khz; #else time_us = (unsigned int) ((jiffies - datagram->jiffies_sent) * 1000000 / HZ); #endif EC_MASTER_ERR(master, "Timeout %u us: Injecting" " external datagram %p size=%zu," " max_queue_size=%zu\n", time_us, datagram, datagram->data_size, master->max_queue_size); } #if DEBUG_INJECT else { EC_MASTER_DBG(master, 0, "Deferred injecting" " of external datagram %p" " size=%u, queue_size=%u\n", datagram, datagram->data_size, queue_size); } #endif } } } } /*****************************************************************************/ /** Sets the expected interval between calls to ecrt_master_send * and calculates the maximum amount of data to queue. */ void ec_master_set_send_interval( ec_master_t *master, /**< EtherCAT master */ unsigned int send_interval /**< Send interval */ ) { master->send_interval = send_interval; master->max_queue_size = (send_interval * 1000) / EC_BYTE_TRANSMISSION_TIME_NS; master->max_queue_size -= master->max_queue_size / 10; } /*****************************************************************************/ /** Places an external datagram in the sdo datagram queue. */ void ec_master_queue_external_datagram( ec_master_t *master, /**< EtherCAT master */ ec_datagram_t *datagram /**< datagram */ ) { ec_datagram_t *queued_datagram; down(&master->io_sem); // check, if the datagram is already queued list_for_each_entry(queued_datagram, &master->external_datagram_queue, queue) { if (queued_datagram == datagram) { datagram->state = EC_DATAGRAM_QUEUED; return; } } #if DEBUG_INJECT EC_MASTER_DBG(master, 0, "Requesting external datagram %p size=%u\n", datagram, datagram->data_size); #endif list_add_tail(&datagram->queue, &master->external_datagram_queue); datagram->state = EC_DATAGRAM_QUEUED; #ifdef EC_HAVE_CYCLES datagram->cycles_sent = get_cycles(); #endif datagram->jiffies_sent = jiffies; master->fsm.idle = 0; up(&master->io_sem); } /*****************************************************************************/ /** Places a datagram in the datagram queue. */ void ec_master_queue_datagram( ec_master_t *master, /**< EtherCAT master */ ec_datagram_t *datagram /**< datagram */ ) { ec_datagram_t *queued_datagram; if (datagram->state == EC_DATAGRAM_SENT) return; // check, if the datagram is already queued list_for_each_entry(queued_datagram, &master->datagram_queue, queue) { if (queued_datagram == datagram) { datagram->skip_count++; EC_MASTER_DBG(master, 1, "skipping datagram %p.\n", datagram); datagram->state = EC_DATAGRAM_QUEUED; return; } } list_add_tail(&datagram->queue, &master->datagram_queue); datagram->state = EC_DATAGRAM_QUEUED; } /*****************************************************************************/ /** Places a datagram in the non-application datagram queue. */ void ec_master_queue_datagram_ext( ec_master_t *master, /**< EtherCAT master */ ec_datagram_t *datagram /**< datagram */ ) { down(&master->ext_queue_sem); list_add_tail(&datagram->queue, &master->ext_datagram_queue); up(&master->ext_queue_sem); } /*****************************************************************************/ /** Sends the datagrams in the queue. * */ void ec_master_send_datagrams(ec_master_t *master /**< EtherCAT master */) { ec_datagram_t *datagram, *next; size_t datagram_size; uint8_t *frame_data, *cur_data; void *follows_word; #ifdef EC_HAVE_CYCLES cycles_t cycles_start, cycles_sent, cycles_end; #endif unsigned long jiffies_sent; unsigned int frame_count, more_datagrams_waiting; struct list_head sent_datagrams; #ifdef EC_HAVE_CYCLES cycles_start = get_cycles(); #endif frame_count = 0; INIT_LIST_HEAD(&sent_datagrams); EC_MASTER_DBG(master, 2, "ec_master_send_datagrams\n"); do { // fetch pointer to transmit socket buffer frame_data = ec_device_tx_data(&master->main_device); cur_data = frame_data + EC_FRAME_HEADER_SIZE; follows_word = NULL; more_datagrams_waiting = 0; // fill current frame with datagrams list_for_each_entry(datagram, &master->datagram_queue, queue) { if (datagram->state != EC_DATAGRAM_QUEUED) continue; // does the current datagram fit in the frame? datagram_size = EC_DATAGRAM_HEADER_SIZE + datagram->data_size + EC_DATAGRAM_FOOTER_SIZE; if (cur_data - frame_data + datagram_size > ETH_DATA_LEN) { more_datagrams_waiting = 1; break; } list_add_tail(&datagram->sent, &sent_datagrams); datagram->index = master->datagram_index++; EC_MASTER_DBG(master, 2, "adding datagram 0x%02X\n", datagram->index); // set "datagram following" flag in previous frame if (follows_word) EC_WRITE_U16(follows_word, EC_READ_U16(follows_word) | 0x8000); // EtherCAT datagram header EC_WRITE_U8 (cur_data, datagram->type); EC_WRITE_U8 (cur_data + 1, datagram->index); memcpy(cur_data + 2, datagram->address, EC_ADDR_LEN); EC_WRITE_U16(cur_data + 6, datagram->data_size & 0x7FF); EC_WRITE_U16(cur_data + 8, 0x0000); follows_word = cur_data + 6; cur_data += EC_DATAGRAM_HEADER_SIZE; // EtherCAT datagram data memcpy(cur_data, datagram->data, datagram->data_size); cur_data += datagram->data_size; // EtherCAT datagram footer EC_WRITE_U16(cur_data, 0x0000); // reset working counter cur_data += EC_DATAGRAM_FOOTER_SIZE; } if (list_empty(&sent_datagrams)) { EC_MASTER_DBG(master, 2, "nothing to send.\n"); break; } // EtherCAT frame header EC_WRITE_U16(frame_data, ((cur_data - frame_data - EC_FRAME_HEADER_SIZE) & 0x7FF) | 0x1000); // pad frame while (cur_data - frame_data < ETH_ZLEN - ETH_HLEN) EC_WRITE_U8(cur_data++, 0x00); EC_MASTER_DBG(master, 2, "frame size: %zu\n", cur_data - frame_data); // send frame ec_device_send(&master->main_device, cur_data - frame_data); #ifdef EC_HAVE_CYCLES cycles_sent = get_cycles(); #endif jiffies_sent = jiffies; // set datagram states and sending timestamps list_for_each_entry_safe(datagram, next, &sent_datagrams, sent) { datagram->state = EC_DATAGRAM_SENT; #ifdef EC_HAVE_CYCLES datagram->cycles_sent = cycles_sent; #endif datagram->jiffies_sent = jiffies_sent; list_del_init(&datagram->sent); // empty list of sent datagrams } frame_count++; } while (more_datagrams_waiting); #ifdef EC_HAVE_CYCLES if (unlikely(master->debug_level > 1)) { cycles_end = get_cycles(); EC_MASTER_DBG(master, 0, "ec_master_send_datagrams" " sent %u frames in %uus.\n", frame_count, (unsigned int) (cycles_end - cycles_start) * 1000 / cpu_khz); } #endif } /*****************************************************************************/ /** Processes a received frame. * * This function is called by the network driver for every received frame. * * \return 0 in case of success, else < 0 */ void ec_master_receive_datagrams(ec_master_t *master, /**< EtherCAT master */ const uint8_t *frame_data, /**< frame data */ size_t size /**< size of the received data */ ) { size_t frame_size, data_size; uint8_t datagram_type, datagram_index; unsigned int cmd_follows, matched; const uint8_t *cur_data; ec_datagram_t *datagram; if (unlikely(size < EC_FRAME_HEADER_SIZE)) { if (master->debug_level) { EC_MASTER_DBG(master, 0, "Corrupted frame received" " (size %zu < %u byte):\n", size, EC_FRAME_HEADER_SIZE); ec_print_data(frame_data, size); } master->stats.corrupted++; ec_master_output_stats(master); return; } cur_data = frame_data; // check length of entire frame frame_size = EC_READ_U16(cur_data) & 0x07FF; cur_data += EC_FRAME_HEADER_SIZE; if (unlikely(frame_size > size)) { if (master->debug_level) { EC_MASTER_DBG(master, 0, "Corrupted frame received" " (invalid frame size %zu for " "received size %zu):\n", frame_size, size); ec_print_data(frame_data, size); } master->stats.corrupted++; ec_master_output_stats(master); return; } cmd_follows = 1; while (cmd_follows) { // process datagram header datagram_type = EC_READ_U8 (cur_data); datagram_index = EC_READ_U8 (cur_data + 1); data_size = EC_READ_U16(cur_data + 6) & 0x07FF; cmd_follows = EC_READ_U16(cur_data + 6) & 0x8000; cur_data += EC_DATAGRAM_HEADER_SIZE; if (unlikely(cur_data - frame_data + data_size + EC_DATAGRAM_FOOTER_SIZE > size)) { if (master->debug_level) { EC_MASTER_DBG(master, 0, "Corrupted frame received" " (invalid data size %zu):\n", data_size); ec_print_data(frame_data, size); } master->stats.corrupted++; ec_master_output_stats(master); return; } // search for matching datagram in the queue matched = 0; list_for_each_entry(datagram, &master->datagram_queue, queue) { if (datagram->index == datagram_index && datagram->state == EC_DATAGRAM_SENT && datagram->type == datagram_type && datagram->data_size == data_size) { matched = 1; break; } } // no matching datagram was found if (!matched) { master->stats.unmatched++; ec_master_output_stats(master); if (unlikely(master->debug_level > 0)) { EC_MASTER_DBG(master, 0, "UNMATCHED datagram:\n"); ec_print_data(cur_data - EC_DATAGRAM_HEADER_SIZE, EC_DATAGRAM_HEADER_SIZE + data_size + EC_DATAGRAM_FOOTER_SIZE); #ifdef EC_DEBUG_RING ec_device_debug_ring_print(&master->main_device); #endif } cur_data += data_size + EC_DATAGRAM_FOOTER_SIZE; continue; } // copy received data into the datagram memory memcpy(datagram->data, cur_data, data_size); cur_data += data_size; // set the datagram's working counter datagram->working_counter = EC_READ_U16(cur_data); cur_data += EC_DATAGRAM_FOOTER_SIZE; // dequeue the received datagram datagram->state = EC_DATAGRAM_RECEIVED; #ifdef EC_HAVE_CYCLES datagram->cycles_received = master->main_device.cycles_poll; #endif datagram->jiffies_received = master->main_device.jiffies_poll; list_del_init(&datagram->queue); } } /*****************************************************************************/ /** Output master statistics. * * This function outputs statistical data on demand, but not more often than * necessary. The output happens at most once a second. */ void ec_master_output_stats(ec_master_t *master /**< EtherCAT master */) { if (unlikely(jiffies - master->stats.output_jiffies >= HZ)) { master->stats.output_jiffies = jiffies; if (master->stats.timeouts) { EC_MASTER_WARN(master, "%u datagram%s TIMED OUT!\n", master->stats.timeouts, master->stats.timeouts == 1 ? "" : "s"); master->stats.timeouts = 0; } if (master->stats.corrupted) { EC_MASTER_WARN(master, "%u frame%s CORRUPTED!\n", master->stats.corrupted, master->stats.corrupted == 1 ? "" : "s"); master->stats.corrupted = 0; } if (master->stats.unmatched) { EC_MASTER_WARN(master, "%u datagram%s UNMATCHED!\n", master->stats.unmatched, master->stats.unmatched == 1 ? "" : "s"); master->stats.unmatched = 0; } } } /*****************************************************************************/ #ifdef EC_USE_HRTIMER /* * Sleep related functions: */ static enum hrtimer_restart ec_master_nanosleep_wakeup(struct hrtimer *timer) { struct hrtimer_sleeper *t = container_of(timer, struct hrtimer_sleeper, timer); struct task_struct *task = t->task; t->task = NULL; if (task) wake_up_process(task); return HRTIMER_NORESTART; } /*****************************************************************************/ #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) /* compatibility with new hrtimer interface */ static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) { return timer->expires; } /*****************************************************************************/ static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) { timer->expires = time; } #endif /*****************************************************************************/ void ec_master_nanosleep(const unsigned long nsecs) { struct hrtimer_sleeper t; enum hrtimer_mode mode = HRTIMER_MODE_REL; hrtimer_init(&t.timer, CLOCK_MONOTONIC, mode); t.timer.function = ec_master_nanosleep_wakeup; t.task = current; #ifdef CONFIG_HIGH_RES_TIMERS #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) t.timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_RESTART; #elif LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26) t.timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ; #elif LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 28) t.timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED; #endif #endif hrtimer_set_expires(&t.timer, ktime_set(0, nsecs)); do { set_current_state(TASK_INTERRUPTIBLE); hrtimer_start(&t.timer, hrtimer_get_expires(&t.timer), mode); if (likely(t.task)) schedule(); hrtimer_cancel(&t.timer); mode = HRTIMER_MODE_ABS; } while (t.task && !signal_pending(current)); } #endif // EC_USE_HRTIMER /*****************************************************************************/ /** Master kernel thread function for IDLE phase. */ static int ec_master_idle_thread(void *priv_data) { ec_master_t *master = (ec_master_t *) priv_data; ec_slave_t *slave = NULL; int fsm_exec; size_t sent_bytes; // send interval in IDLE phase ec_master_set_send_interval(master, 1000000 / HZ); EC_MASTER_DBG(master, 1, "Idle thread running with send interval = %u us," " max data size=%zu\n", master->send_interval, master->max_queue_size); while (!kthread_should_stop()) { ec_datagram_output_stats(&master->fsm_datagram); // receive down(&master->io_sem); ecrt_master_receive(master); up(&master->io_sem); fsm_exec = 0; // execute master & slave state machines if (down_interruptible(&master->master_sem)) break; fsm_exec = ec_fsm_master_exec(&master->fsm); for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { ec_fsm_slave_exec(&slave->fsm); } up(&master->master_sem); // queue and send down(&master->io_sem); if (fsm_exec) { ec_master_queue_datagram(master, &master->fsm_datagram); } ec_master_inject_external_datagrams(master); ecrt_master_send(master); sent_bytes = master->main_device.tx_skb[ master->main_device.tx_ring_index]->len; up(&master->io_sem); if (ec_fsm_master_idle(&master->fsm)) { #ifdef EC_USE_HRTIMER ec_master_nanosleep(master->send_interval * 1000); #else set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1); #endif } else { #ifdef EC_USE_HRTIMER ec_master_nanosleep(sent_bytes * EC_BYTE_TRANSMISSION_TIME_NS); #else schedule(); #endif } } EC_MASTER_DBG(master, 1, "Master IDLE thread exiting...\n"); return 0; } /*****************************************************************************/ /** Master kernel thread function for OPERATION phase. */ static int ec_master_operation_thread(void *priv_data) { ec_master_t *master = (ec_master_t *) priv_data; ec_slave_t *slave = NULL; int fsm_exec; EC_MASTER_DBG(master, 1, "Operation thread running" " with fsm interval = %u us, max data size=%zu\n", master->send_interval, master->max_queue_size); while (!kthread_should_stop()) { ec_datagram_output_stats(&master->fsm_datagram); if (master->injection_seq_rt == master->injection_seq_fsm) { // output statistics ec_master_output_stats(master); fsm_exec = 0; // execute master & slave state machines if (down_interruptible(&master->master_sem)) break; fsm_exec += ec_fsm_master_exec(&master->fsm); for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { ec_fsm_slave_exec(&slave->fsm); } up(&master->master_sem); // inject datagrams (let the rt thread queue them, see ecrt_master_send) if (fsm_exec) master->injection_seq_fsm++; } #ifdef EC_USE_HRTIMER // the op thread should not work faster than the sending RT thread ec_master_nanosleep(master->send_interval * 1000); #else if (ec_fsm_master_idle(&master->fsm)) { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1); } else { schedule(); } #endif } EC_MASTER_DBG(master, 1, "Master OP thread exiting...\n"); return 0; } /*****************************************************************************/ #ifdef EC_EOE /** Starts Ethernet over EtherCAT processing on demand. */ void ec_master_eoe_start(ec_master_t *master /**< EtherCAT master */) { struct sched_param param = { .sched_priority = 0 }; if (master->eoe_thread) { EC_MASTER_WARN(master, "EoE already running!\n"); return; } if (list_empty(&master->eoe_handlers)) return; if (!master->send_cb || !master->receive_cb) { EC_MASTER_WARN(master, "No EoE processing" " because of missing callbacks!\n"); return; } EC_MASTER_INFO(master, "Starting EoE thread.\n"); master->eoe_thread = kthread_run(ec_master_eoe_thread, master, "EtherCAT-EoE"); if (IS_ERR(master->eoe_thread)) { int err = (int) PTR_ERR(master->eoe_thread); EC_MASTER_ERR(master, "Failed to start EoE thread (error %i)!\n", err); master->eoe_thread = NULL; return; } sched_setscheduler(master->eoe_thread, SCHED_NORMAL, ¶m); set_user_nice(master->eoe_thread, 0); } /*****************************************************************************/ /** Stops the Ethernet over EtherCAT processing. */ void ec_master_eoe_stop(ec_master_t *master /**< EtherCAT master */) { if (master->eoe_thread) { EC_MASTER_INFO(master, "Stopping EoE thread.\n"); kthread_stop(master->eoe_thread); master->eoe_thread = NULL; EC_MASTER_INFO(master, "EoE thread exited.\n"); } } /*****************************************************************************/ /** Does the Ethernet over EtherCAT processing. */ static int ec_master_eoe_thread(void *priv_data) { ec_master_t *master = (ec_master_t *) priv_data; ec_eoe_t *eoe; unsigned int none_open, sth_to_send, all_idle; EC_MASTER_DBG(master, 1, "EoE thread running.\n"); while (!kthread_should_stop()) { none_open = 1; all_idle = 1; list_for_each_entry(eoe, &master->eoe_handlers, list) { if (ec_eoe_is_open(eoe)) { none_open = 0; break; } } if (none_open) goto schedule; // receive datagrams master->receive_cb(master->cb_data); // actual EoE processing sth_to_send = 0; list_for_each_entry(eoe, &master->eoe_handlers, list) { ec_eoe_run(eoe); if (eoe->queue_datagram) { sth_to_send = 1; } if (!ec_eoe_is_idle(eoe)) { all_idle = 0; } } if (sth_to_send) { list_for_each_entry(eoe, &master->eoe_handlers, list) { ec_eoe_queue(eoe); } // (try to) send datagrams down(&master->ext_queue_sem); master->send_cb(master->cb_data); up(&master->ext_queue_sem); } schedule: if (all_idle) { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1); } else { schedule(); } } EC_MASTER_DBG(master, 1, "EoE thread exiting...\n"); return 0; } #endif /*****************************************************************************/ /** Detaches the slave configurations from the slaves. */ void ec_master_detach_slave_configs( ec_master_t *master /**< EtherCAT master. */ ) { ec_slave_config_t *sc; list_for_each_entry(sc, &master->configs, list) { ec_slave_config_detach(sc); } } /*****************************************************************************/ /** Attaches the slave configurations to the slaves. */ void ec_master_attach_slave_configs( ec_master_t *master /**< EtherCAT master. */ ) { ec_slave_config_t *sc; list_for_each_entry(sc, &master->configs, list) { ec_slave_config_attach(sc); } } /*****************************************************************************/ /** Common implementation for ec_master_find_slave() * and ec_master_find_slave_const(). */ #define EC_FIND_SLAVE \ do { \ if (alias) { \ for (; slave < master->slaves + master->slave_count; \ slave++) { \ if (slave->effective_alias == alias) \ break; \ } \ if (slave == master->slaves + master->slave_count) \ return NULL; \ } \ \ slave += position; \ if (slave < master->slaves + master->slave_count) { \ return slave; \ } else { \ return NULL; \ } \ } while (0) /** Finds a slave in the bus, given the alias and position. */ ec_slave_t *ec_master_find_slave( ec_master_t *master, /**< EtherCAT master. */ uint16_t alias, /**< Slave alias. */ uint16_t position /**< Slave position. */ ) { ec_slave_t *slave = master->slaves; EC_FIND_SLAVE; } /** Finds a slave in the bus, given the alias and position. * * Const version. */ const ec_slave_t *ec_master_find_slave_const( const ec_master_t *master, /**< EtherCAT master. */ uint16_t alias, /**< Slave alias. */ uint16_t position /**< Slave position. */ ) { const ec_slave_t *slave = master->slaves; EC_FIND_SLAVE; } /*****************************************************************************/ /** Get the number of slave configurations provided by the application. * * \return Number of configurations. */ unsigned int ec_master_config_count( const ec_master_t *master /**< EtherCAT master. */ ) { const ec_slave_config_t *sc; unsigned int count = 0; list_for_each_entry(sc, &master->configs, list) { count++; } return count; } /*****************************************************************************/ /** Common implementation for ec_master_get_config() * and ec_master_get_config_const(). */ #define EC_FIND_CONFIG \ do { \ list_for_each_entry(sc, &master->configs, list) { \ if (pos--) \ continue; \ return sc; \ } \ return NULL; \ } while (0) /** Get a slave configuration via its position in the list. * * \return Slave configuration or \a NULL. */ ec_slave_config_t *ec_master_get_config( const ec_master_t *master, /**< EtherCAT master. */ unsigned int pos /**< List position. */ ) { ec_slave_config_t *sc; EC_FIND_CONFIG; } /** Get a slave configuration via its position in the list. * * Const version. * * \return Slave configuration or \a NULL. */ const ec_slave_config_t *ec_master_get_config_const( const ec_master_t *master, /**< EtherCAT master. */ unsigned int pos /**< List position. */ ) { const ec_slave_config_t *sc; EC_FIND_CONFIG; } /*****************************************************************************/ /** Get the number of domains. * * \return Number of domains. */ unsigned int ec_master_domain_count( const ec_master_t *master /**< EtherCAT master. */ ) { const ec_domain_t *domain; unsigned int count = 0; list_for_each_entry(domain, &master->domains, list) { count++; } return count; } /*****************************************************************************/ /** Common implementation for ec_master_find_domain() and * ec_master_find_domain_const(). */ #define EC_FIND_DOMAIN \ do { \ list_for_each_entry(domain, &master->domains, list) { \ if (index--) \ continue; \ return domain; \ } \ \ return NULL; \ } while (0) /** Get a domain via its position in the list. * * \return Domain pointer, or \a NULL if not found. */ ec_domain_t *ec_master_find_domain( ec_master_t *master, /**< EtherCAT master. */ unsigned int index /**< Domain index. */ ) { ec_domain_t *domain; EC_FIND_DOMAIN; } /** Get a domain via its position in the list. * * Const version. * * \return Domain pointer, or \a NULL if not found. */ const ec_domain_t *ec_master_find_domain_const( const ec_master_t *master, /**< EtherCAT master. */ unsigned int index /**< Domain index. */ ) { const ec_domain_t *domain; EC_FIND_DOMAIN; } /*****************************************************************************/ #ifdef EC_EOE /** Get the number of EoE handlers. * * \return Number of EoE handlers. */ uint16_t ec_master_eoe_handler_count( const ec_master_t *master /**< EtherCAT master. */ ) { const ec_eoe_t *eoe; unsigned int count = 0; list_for_each_entry(eoe, &master->eoe_handlers, list) { count++; } return count; } /*****************************************************************************/ /** Get an EoE handler via its position in the list. * * Const version. * * \return EoE handler pointer, or \a NULL if not found. */ const ec_eoe_t *ec_master_get_eoe_handler_const( const ec_master_t *master, /**< EtherCAT master. */ uint16_t index /**< EoE handler index. */ ) { const ec_eoe_t *eoe; list_for_each_entry(eoe, &master->eoe_handlers, list) { if (index--) continue; return eoe; } return NULL; } #endif /*****************************************************************************/ /** Set the debug level. * * \retval 0 Success. * \retval -EINVAL Invalid debug level. */ int ec_master_debug_level( ec_master_t *master, /**< EtherCAT master. */ unsigned int level /**< Debug level. May be 0, 1 or 2. */ ) { if (level > 2) { EC_MASTER_ERR(master, "Invalid debug level %u!\n", level); return -EINVAL; } if (level != master->debug_level) { master->debug_level = level; EC_MASTER_INFO(master, "Master debug level set to %u.\n", master->debug_level); } return 0; } /*****************************************************************************/ /** Finds the DC reference clock. */ void ec_master_find_dc_ref_clock( ec_master_t *master /**< EtherCAT master. */ ) { ec_slave_t *slave, *ref = NULL; for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { if (slave->base_dc_supported && slave->has_dc_system_time) { ref = slave; break; } } master->dc_ref_clock = ref; // This call always succeeds, because the datagram has been pre-allocated. ec_datagram_frmw(&master->sync_datagram, ref ? ref->station_address : 0xffff, 0x0910, 4); } /*****************************************************************************/ /** Calculates the bus topology; recursion function. */ int ec_master_calc_topology_rec( ec_master_t *master, /**< EtherCAT master. */ ec_slave_t *port0_slave, /**< Slave at port 0. */ unsigned int *slave_position /**< Slave position. */ ) { ec_slave_t *slave = master->slaves + *slave_position; unsigned int i; int ret; slave->ports[0].next_slave = port0_slave; for (i = 1; i < EC_MAX_PORTS; i++) { if (!slave->ports[i].link.loop_closed) { *slave_position = *slave_position + 1; if (*slave_position < master->slave_count) { slave->ports[i].next_slave = master->slaves + *slave_position; ret = ec_master_calc_topology_rec(master, slave, slave_position); if (ret) return ret; } else { return -1; } } } return 0; } /*****************************************************************************/ /** Calculates the bus topology. */ void ec_master_calc_topology( ec_master_t *master /**< EtherCAT master. */ ) { unsigned int slave_position = 0; if (master->slave_count == 0) return; if (ec_master_calc_topology_rec(master, NULL, &slave_position)) EC_MASTER_ERR(master, "Failed to calculate bus topology.\n"); } /*****************************************************************************/ /** Calculates the bus transmission delays. */ void ec_master_calc_transmission_delays( ec_master_t *master /**< EtherCAT master. */ ) { ec_slave_t *slave; for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { ec_slave_calc_port_delays(slave); } if (master->dc_ref_clock) { uint32_t delay = 0; ec_slave_calc_transmission_delays_rec(master->dc_ref_clock, &delay); } } /*****************************************************************************/ /** Distributed-clocks calculations. */ void ec_master_calc_dc( ec_master_t *master /**< EtherCAT master. */ ) { // find DC reference clock ec_master_find_dc_ref_clock(master); // calculate bus topology ec_master_calc_topology(master); ec_master_calc_transmission_delays(master); } /*****************************************************************************/ /** Request OP state for configured slaves. */ void ec_master_request_op( ec_master_t *master /**< EtherCAT master. */ ) { unsigned int i; ec_slave_t *slave; if (!master->active) return; EC_MASTER_DBG(master, 1, "Requesting OP...\n"); // request OP for all configured slaves for (i = 0; i < master->slave_count; i++) { slave = master->slaves + i; if (slave->config) { ec_slave_request_state(slave, EC_SLAVE_STATE_OP); } } // always set DC reference clock to OP if (master->dc_ref_clock) { ec_slave_request_state(master->dc_ref_clock, EC_SLAVE_STATE_OP); } } /****************************************************************************** * Application interface *****************************************************************************/ /** Same as ecrt_master_create_domain(), but with ERR_PTR() return value. */ ec_domain_t *ecrt_master_create_domain_err( ec_master_t *master /**< master */ ) { ec_domain_t *domain, *last_domain; unsigned int index; EC_MASTER_DBG(master, 1, "ecrt_master_create_domain(master = 0x%p)\n", master); if (!(domain = (ec_domain_t *) kmalloc(sizeof(ec_domain_t), GFP_KERNEL))) { EC_MASTER_ERR(master, "Error allocating domain memory!\n"); return ERR_PTR(-ENOMEM); } down(&master->master_sem); if (list_empty(&master->domains)) { index = 0; } else { last_domain = list_entry(master->domains.prev, ec_domain_t, list); index = last_domain->index + 1; } ec_domain_init(domain, master, index); list_add_tail(&domain->list, &master->domains); up(&master->master_sem); EC_MASTER_DBG(master, 1, "Created domain %u.\n", domain->index); return domain; } /*****************************************************************************/ ec_domain_t *ecrt_master_create_domain( ec_master_t *master /**< master */ ) { ec_domain_t *d = ecrt_master_create_domain_err(master); return IS_ERR(d) ? NULL : d; } /*****************************************************************************/ int ecrt_master_activate(ec_master_t *master) { uint32_t domain_offset; ec_domain_t *domain; int ret; #ifdef EC_EOE int eoe_was_running; #endif EC_MASTER_DBG(master, 1, "ecrt_master_activate(master = 0x%p)\n", master); if (master->active) { EC_MASTER_WARN(master, "%s: Master already active!\n", __func__); return 0; } down(&master->master_sem); // finish all domains domain_offset = 0; list_for_each_entry(domain, &master->domains, list) { ret = ec_domain_finish(domain, domain_offset); if (ret < 0) { up(&master->master_sem); EC_MASTER_ERR(master, "Failed to finish domain 0x%p!\n", domain); return ret; } domain_offset += domain->data_size; } up(&master->master_sem); // restart EoE process and master thread with new locking ec_master_thread_stop(master); #ifdef EC_EOE eoe_was_running = master->eoe_thread != NULL; ec_master_eoe_stop(master); #endif EC_MASTER_DBG(master, 1, "FSM datagram is %p.\n", &master->fsm_datagram); master->injection_seq_fsm = 0; master->injection_seq_rt = 0; master->send_cb = master->app_send_cb; master->receive_cb = master->app_receive_cb; master->cb_data = master->app_cb_data; #ifdef EC_EOE if (eoe_was_running) { ec_master_eoe_start(master); } #endif ret = ec_master_thread_start(master, ec_master_operation_thread, "EtherCAT-OP"); if (ret < 0) { EC_MASTER_ERR(master, "Failed to start master thread!\n"); return ret; } master->allow_config = 1; // request the current configuration master->allow_scan = 1; // allow re-scanning on topology change master->active = 1; // notify state machine, that the configuration shall now be applied master->config_changed = 1; return 0; } /*****************************************************************************/ void ecrt_master_deactivate(ec_master_t *master) { ec_slave_t *slave; #ifdef EC_EOE ec_eoe_t *eoe; int eoe_was_running; #endif EC_MASTER_DBG(master, 1, "%s(master = 0x%p)\n", __func__, master); if (!master->active) { EC_MASTER_WARN(master, "%s: Master not active.\n", __func__); return; } ec_master_thread_stop(master); #ifdef EC_EOE eoe_was_running = master->eoe_thread != NULL; ec_master_eoe_stop(master); #endif master->send_cb = ec_master_internal_send_cb; master->receive_cb = ec_master_internal_receive_cb; master->cb_data = master; ec_master_clear_config(master); for (slave = master->slaves; slave < master->slaves + master->slave_count; slave++) { // set states for all slaves ec_slave_request_state(slave, EC_SLAVE_STATE_PREOP); // mark for reconfiguration, because the master could have no // possibility for a reconfiguration between two sequential operation // phases. slave->force_config = 1; } #ifdef EC_EOE // ... but leave EoE slaves in OP list_for_each_entry(eoe, &master->eoe_handlers, list) { if (ec_eoe_is_open(eoe)) ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_OP); } #endif master->app_time = 0ULL; master->app_start_time = 0ULL; master->has_app_time = 0; #ifdef EC_EOE if (eoe_was_running) { ec_master_eoe_start(master); } #endif if (ec_master_thread_start(master, ec_master_idle_thread, "EtherCAT-IDLE")) EC_MASTER_WARN(master, "Failed to restart master thread!\n"); master->allow_scan = 1; master->allow_config = 1; master->active = 0; } /*****************************************************************************/ void ecrt_master_send(ec_master_t *master) { ec_datagram_t *datagram, *n; if (master->injection_seq_rt != master->injection_seq_fsm) { // inject datagrams produced by master & slave FSMs ec_master_queue_datagram(master, &master->fsm_datagram); master->injection_seq_rt = master->injection_seq_fsm; } ec_master_inject_external_datagrams(master); if (unlikely(!master->main_device.link_state)) { // link is down, no datagram can be sent list_for_each_entry_safe(datagram, n, &master->datagram_queue, queue) { datagram->state = EC_DATAGRAM_ERROR; list_del_init(&datagram->queue); } // query link state ec_device_poll(&master->main_device); // clear frame statistics ec_device_clear_stats(&master->main_device); return; } // send frames ec_master_send_datagrams(master); } /*****************************************************************************/ void ecrt_master_receive(ec_master_t *master) { ec_datagram_t *datagram, *next; // receive datagrams ec_device_poll(&master->main_device); // dequeue all datagrams that timed out list_for_each_entry_safe(datagram, next, &master->datagram_queue, queue) { if (datagram->state != EC_DATAGRAM_SENT) continue; #ifdef EC_HAVE_CYCLES if (master->main_device.cycles_poll - datagram->cycles_sent > timeout_cycles) { #else if (master->main_device.jiffies_poll - datagram->jiffies_sent > timeout_jiffies) { #endif list_del_init(&datagram->queue); datagram->state = EC_DATAGRAM_TIMED_OUT; master->stats.timeouts++; ec_master_output_stats(master); if (unlikely(master->debug_level > 0)) { unsigned int time_us; #ifdef EC_HAVE_CYCLES time_us = (unsigned int) (master->main_device.cycles_poll - datagram->cycles_sent) * 1000 / cpu_khz; #else time_us = (unsigned int) ((master->main_device.jiffies_poll - datagram->jiffies_sent) * 1000000 / HZ); #endif EC_MASTER_DBG(master, 0, "TIMED OUT datagram %p," " index %02X waited %u us.\n", datagram, datagram->index, time_us); } } } } /*****************************************************************************/ void ecrt_master_send_ext(ec_master_t *master) { ec_datagram_t *datagram, *next; list_for_each_entry_safe(datagram, next, &master->ext_datagram_queue, queue) { list_del(&datagram->queue); ec_master_queue_datagram(master, datagram); } ecrt_master_send(master); } /*****************************************************************************/ /** Same as ecrt_master_slave_config(), but with ERR_PTR() return value. */ ec_slave_config_t *ecrt_master_slave_config_err(ec_master_t *master, uint16_t alias, uint16_t position, uint32_t vendor_id, uint32_t product_code) { ec_slave_config_t *sc; unsigned int found = 0; EC_MASTER_DBG(master, 1, "ecrt_master_slave_config(master = 0x%p," " alias = %u, position = %u, vendor_id = 0x%08x," " product_code = 0x%08x)\n", master, alias, position, vendor_id, product_code); list_for_each_entry(sc, &master->configs, list) { if (sc->alias == alias && sc->position == position) { found = 1; break; } } if (found) { // config with same alias/position already existing if (sc->vendor_id != vendor_id || sc->product_code != product_code) { EC_MASTER_ERR(master, "Slave type mismatch. Slave was" " configured as 0x%08X/0x%08X before. Now configuring" " with 0x%08X/0x%08X.\n", sc->vendor_id, sc->product_code, vendor_id, product_code); return ERR_PTR(-ENOENT); } } else { EC_MASTER_DBG(master, 1, "Creating slave configuration for %u:%u," " 0x%08X/0x%08X.\n", alias, position, vendor_id, product_code); if (!(sc = (ec_slave_config_t *) kmalloc(sizeof(ec_slave_config_t), GFP_KERNEL))) { EC_MASTER_ERR(master, "Failed to allocate memory" " for slave configuration.\n"); return ERR_PTR(-ENOMEM); } ec_slave_config_init(sc, master, alias, position, vendor_id, product_code); down(&master->master_sem); // try to find the addressed slave ec_slave_config_attach(sc); ec_slave_config_load_default_sync_config(sc); list_add_tail(&sc->list, &master->configs); up(&master->master_sem); } return sc; } /*****************************************************************************/ ec_slave_config_t *ecrt_master_slave_config(ec_master_t *master, uint16_t alias, uint16_t position, uint32_t vendor_id, uint32_t product_code) { ec_slave_config_t *sc = ecrt_master_slave_config_err(master, alias, position, vendor_id, product_code); return IS_ERR(sc) ? NULL : sc; } /*****************************************************************************/ int ecrt_master(ec_master_t *master, ec_master_info_t *master_info) { EC_MASTER_DBG(master, 1, "ecrt_master(master = 0x%p," " master_info = 0x%p)\n", master, master_info); master_info->slave_count = master->slave_count; master_info->link_up = master->main_device.link_state; master_info->scan_busy = master->scan_busy; master_info->app_time = master->app_time; return 0; } /*****************************************************************************/ int ecrt_master_get_slave(ec_master_t *master, uint16_t slave_position, ec_slave_info_t *slave_info) { const ec_slave_t *slave; if (down_interruptible(&master->master_sem)) { return -EINTR; } slave = ec_master_find_slave_const(master, 0, slave_position); slave_info->position = slave->ring_position; slave_info->vendor_id = slave->sii.vendor_id; slave_info->product_code = slave->sii.product_code; slave_info->revision_number = slave->sii.revision_number; slave_info->serial_number = slave->sii.serial_number; slave_info->alias = slave->effective_alias; slave_info->current_on_ebus = slave->sii.current_on_ebus; slave_info->al_state = slave->current_state; slave_info->error_flag = slave->error_flag; slave_info->sync_count = slave->sii.sync_count; slave_info->sdo_count = ec_slave_sdo_count(slave); if (slave->sii.name) { strncpy(slave_info->name, slave->sii.name, EC_MAX_STRING_LENGTH); } else { slave_info->name[0] = 0; } up(&master->master_sem); return 0; } /*****************************************************************************/ void ecrt_master_callbacks(ec_master_t *master, void (*send_cb)(void *), void (*receive_cb)(void *), void *cb_data) { EC_MASTER_DBG(master, 1, "ecrt_master_callbacks(master = 0x%p," " send_cb = 0x%p, receive_cb = 0x%p, cb_data = 0x%p)\n", master, send_cb, receive_cb, cb_data); master->app_send_cb = send_cb; master->app_receive_cb = receive_cb; master->app_cb_data = cb_data; } /*****************************************************************************/ void ecrt_master_state(const ec_master_t *master, ec_master_state_t *state) { state->slaves_responding = master->fsm.slaves_responding; state->al_states = master->fsm.slave_states; state->link_up = master->main_device.link_state; } /*****************************************************************************/ void ecrt_master_application_time(ec_master_t *master, uint64_t app_time) { master->app_time = app_time; if (unlikely(!master->has_app_time)) { master->app_start_time = app_time; master->has_app_time = 1; } } /*****************************************************************************/ void ecrt_master_sync_reference_clock(ec_master_t *master) { EC_WRITE_U32(master->ref_sync_datagram.data, master->app_time); ec_master_queue_datagram(master, &master->ref_sync_datagram); } /*****************************************************************************/ void ecrt_master_sync_slave_clocks(ec_master_t *master) { ec_datagram_zero(&master->sync_datagram); ec_master_queue_datagram(master, &master->sync_datagram); } /*****************************************************************************/ void ecrt_master_sync_monitor_queue(ec_master_t *master) { ec_datagram_zero(&master->sync_mon_datagram); ec_master_queue_datagram(master, &master->sync_mon_datagram); } /*****************************************************************************/ uint32_t ecrt_master_sync_monitor_process(ec_master_t *master) { if (master->sync_mon_datagram.state == EC_DATAGRAM_RECEIVED) { return EC_READ_U32(master->sync_mon_datagram.data) & 0x7fffffff; } else { return 0xffffffff; } } /*****************************************************************************/ /** \cond */ EXPORT_SYMBOL(ecrt_master_create_domain); EXPORT_SYMBOL(ecrt_master_activate); EXPORT_SYMBOL(ecrt_master_deactivate); EXPORT_SYMBOL(ecrt_master_send); EXPORT_SYMBOL(ecrt_master_send_ext); EXPORT_SYMBOL(ecrt_master_receive); EXPORT_SYMBOL(ecrt_master_callbacks); EXPORT_SYMBOL(ecrt_master); EXPORT_SYMBOL(ecrt_master_get_slave); EXPORT_SYMBOL(ecrt_master_slave_config); EXPORT_SYMBOL(ecrt_master_state); EXPORT_SYMBOL(ecrt_master_application_time); EXPORT_SYMBOL(ecrt_master_sync_reference_clock); EXPORT_SYMBOL(ecrt_master_sync_slave_clocks); EXPORT_SYMBOL(ecrt_master_sync_monitor_queue); EXPORT_SYMBOL(ecrt_master_sync_monitor_process); /** \endcond */ /*****************************************************************************/