/******************************************************************************
*
* $Id$
*
* 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.
*
*****************************************************************************/
/**
\file
EtherCAT domain methods.
*/
/*****************************************************************************/
#include <linux/module.h>
#include "globals.h"
#include "master.h"
#include "slave_config.h"
#include "domain.h"
/*****************************************************************************/
void ec_domain_clear_data(ec_domain_t *);
/*****************************************************************************/
/** Domain constructor.
*/
void ec_domain_init(
ec_domain_t *domain, /**< EtherCAT domain. */
ec_master_t *master, /**< Parent master. */
unsigned int index /**< Index. */
)
{
domain->master = master;
domain->index = index;
INIT_LIST_HEAD(&domain->fmmu_configs);
domain->data_size = 0;
domain->tx_size = 0;
domain->data = NULL;
domain->data_origin = EC_ORIG_INTERNAL;
domain->logical_base_address = 0x00000000;
INIT_LIST_HEAD(&domain->datagrams);
domain->working_counter = 0x0000;
domain->expected_working_counter = 0x0000;
domain->working_counter_changes = 0;
domain->notify_jiffies = 0;
}
/*****************************************************************************/
/** Domain destructor.
*/
void ec_domain_clear(ec_domain_t *domain /**< EtherCAT domain */)
{
ec_datagram_t *datagram, *next;
// dequeue and free datagrams
list_for_each_entry_safe(datagram, next, &domain->datagrams, list) {
ec_datagram_clear(datagram);
kfree(datagram);
}
ec_domain_clear_data(domain);
}
/*****************************************************************************/
/** Frees internally allocated memory.
*/
void ec_domain_clear_data(
ec_domain_t *domain /**< EtherCAT domain. */
)
{
if (domain->data_origin == EC_ORIG_INTERNAL && domain->data) {
kfree(domain->data);
}
domain->data = NULL;
domain->data_origin = EC_ORIG_INTERNAL;
}
/*****************************************************************************/
/** Adds an FMMU configuration to the domain.
*/
void ec_domain_add_fmmu_config(
ec_domain_t *domain, /**< EtherCAT domain. */
ec_fmmu_config_t *fmmu /**< FMMU configuration. */
)
{
fmmu->domain = domain;
domain->data_size += fmmu->data_size;
domain->tx_size += fmmu->tx_size;
list_add_tail(&fmmu->list, &domain->fmmu_configs);
EC_MASTER_DBG(domain->master, 1, "Domain %u:"
" Added %u bytes, total %zu.\n",
domain->index, fmmu->data_size, domain->data_size);
}
/*****************************************************************************/
/** Allocates a domain datagram and appends it to the list.
*
* The datagram type and expected working counters are determined by the
* number of input and output fmmus that share the datagram.
*
* \retval 0 Success.
* \retval <0 Error code.
*/
int ec_domain_add_datagram(
ec_domain_t *domain, /**< EtherCAT domain. */
uint32_t logical_offset, /**< Logical offset. */
size_t data_size, /**< Size of the data. */
uint8_t *data, /**< Process data. */
const unsigned int used[] /**< Slave config counter for in/out. */
)
{
ec_datagram_t *datagram;
int ret;
if (!(datagram = kmalloc(sizeof(ec_datagram_t), GFP_KERNEL))) {
EC_MASTER_ERR(domain->master,
"Failed to allocate domain datagram!\n");
return -ENOMEM;
}
ec_datagram_init(datagram);
snprintf(datagram->name, EC_DATAGRAM_NAME_SIZE,
"domain%u-%u", domain->index, logical_offset);
if (used[EC_DIR_OUTPUT] && used[EC_DIR_INPUT]) { // inputs and outputs
ret = ec_datagram_lrw(datagram, logical_offset, data_size, data);
if (ret < 0) {
kfree(datagram);
return ret;
}
// If LRW is used, output FMMUs increment the working counter by 2,
// while input FMMUs increment it by 1.
domain->expected_working_counter +=
used[EC_DIR_OUTPUT] * 2 + used[EC_DIR_INPUT];
} else if (used[EC_DIR_OUTPUT]) { // outputs only
ret = ec_datagram_lwr(datagram, logical_offset, data_size, data);
if (ret < 0) {
kfree(datagram);
return ret;
}
domain->expected_working_counter += used[EC_DIR_OUTPUT];
} else { // inputs only (or nothing)
ret = ec_datagram_lrd(datagram, logical_offset, data_size, data);
if (ret < 0) {
kfree(datagram);
return ret;
}
domain->expected_working_counter += used[EC_DIR_INPUT];
}
ec_datagram_zero(datagram);
list_add_tail(&datagram->list, &domain->datagrams);
datagram->domain = domain;
return 0;
}
/*****************************************************************************/
/** Domain finish helper function.
*
* Detects, if a slave configuration has already been taken into account for
* a datagram's expected working counter calculation.
*
* Walks through the list of all FMMU configurations for the current datagram
* and ends before the current datagram.
*/
int shall_count(
const ec_fmmu_config_t *cur_fmmu, /**< Current FMMU with direction to
search for. */
const ec_fmmu_config_t *first_fmmu /**< Datagram's first FMMU. */
)
{
for (; first_fmmu != cur_fmmu;
first_fmmu = list_entry(first_fmmu->list.next,
ec_fmmu_config_t, list)) {
if (first_fmmu->sc == cur_fmmu->sc
&& first_fmmu->dir == cur_fmmu->dir) {
return 0; // was already counted
}
}
return 1;
}
/*****************************************************************************/
/** Finishes a domain.
*
* This allocates the necessary datagrams and writes the correct logical
* addresses to every configured FMMU.
*
* \todo Check for FMMUs that do not fit into any datagram.
*
* \retval 0 Success
* \retval <0 Error code.
*/
int ec_domain_finish(
ec_domain_t *domain, /**< EtherCAT domain. */
uint32_t base_address /**< Logical base address. */
)
{
uint32_t datagram_offset;
size_t datagram_size;
unsigned int datagram_count;
unsigned int datagram_used[EC_DIR_COUNT];
ec_fmmu_config_t *fmmu;
const ec_fmmu_config_t *datagram_first_fmmu = NULL;
const ec_datagram_t *datagram;
int ret;
domain->logical_base_address = base_address;
if (domain->data_size && domain->data_origin == EC_ORIG_INTERNAL) {
if (!(domain->data =
(uint8_t *) kmalloc(domain->data_size, GFP_KERNEL))) {
EC_MASTER_ERR(domain->master, "Failed to allocate %zu bytes"
" internal memory for domain %u!\n",
domain->data_size, domain->index);
return -ENOMEM;
}
}
// Cycle through all domain FMMUs and
// - correct the logical base addresses
// - set up the datagrams to carry the process data
// - calculate the datagrams' expected working counters
datagram_offset = 0;
datagram_size = 0;
datagram_count = 0;
datagram_used[EC_DIR_OUTPUT] = 0;
datagram_used[EC_DIR_INPUT] = 0;
if (!list_empty(&domain->fmmu_configs)) {
datagram_first_fmmu =
list_entry(domain->fmmu_configs.next, ec_fmmu_config_t, list);
}
list_for_each_entry(fmmu, &domain->fmmu_configs, list) {
// Correct logical FMMU address
fmmu->logical_start_address += base_address;
fmmu->domain_address += base_address;
// Increment input/output counter to determine datagram types
// and calculate expected working counters
if (shall_count(fmmu, datagram_first_fmmu)) {
datagram_used[fmmu->dir]++;
}
// If the current FMMU's data do not fit in the current datagram,
// allocate a new one.
if (datagram_size + fmmu->tx_size > EC_MAX_DATA_SIZE) {
ret = ec_domain_add_datagram(domain,
domain->logical_base_address + datagram_offset,
datagram_size, domain->data + datagram_offset,
datagram_used);
if (ret < 0)
return ret;
datagram_offset += datagram_size;
datagram_size = 0;
datagram_count++;
datagram_used[EC_DIR_OUTPUT] = 0;
datagram_used[EC_DIR_INPUT] = 0;
datagram_first_fmmu = fmmu;
}
datagram_size += fmmu->tx_size;
}
// Allocate last datagram, if data are left (this is also the case if the
// process data fit into a single datagram)
if (datagram_size) {
ret = ec_domain_add_datagram(domain,
domain->logical_base_address + datagram_offset,
datagram_size, domain->data + datagram_offset,
datagram_used);
if (ret < 0)
return ret;
datagram_count++;
}
EC_MASTER_INFO(domain->master, "Domain%u: Logical address 0x%08x,"
" %zu byte, expected working counter %u.\n", domain->index,
domain->logical_base_address, domain->data_size,
domain->expected_working_counter);
list_for_each_entry(datagram, &domain->datagrams, list) {
EC_MASTER_INFO(domain->master, " Datagram %s: Logical offset 0x%08x,"
" %zu byte, type %s.\n", datagram->name,
EC_READ_U32(datagram->address), datagram->data_size,
ec_datagram_type_string(datagram));
}
return 0;
}
/*****************************************************************************/
/** Get the number of FMMU configurations of the domain.
*/
unsigned int ec_domain_fmmu_count(const ec_domain_t *domain)
{
const ec_fmmu_config_t *fmmu;
unsigned int num = 0;
list_for_each_entry(fmmu, &domain->fmmu_configs, list) {
num++;
}
return num;
}
/*****************************************************************************/
/** Get a certain FMMU configuration via its position in the list.
*/
const ec_fmmu_config_t *ec_domain_find_fmmu(
const ec_domain_t *domain, /**< EtherCAT domain. */
unsigned int pos /**< List position. */
)
{
const ec_fmmu_config_t *fmmu;
list_for_each_entry(fmmu, &domain->fmmu_configs, list) {
if (pos--)
continue;
return fmmu;
}
return NULL;
}
/******************************************************************************
* Application interface
*****************************************************************************/
int ecrt_domain_reg_pdo_entry_list(ec_domain_t *domain,
const ec_pdo_entry_reg_t *regs)
{
const ec_pdo_entry_reg_t *reg;
ec_slave_config_t *sc;
int ret;
EC_MASTER_DBG(domain->master, 1, "ecrt_domain_reg_pdo_entry_list("
"domain = 0x%p, regs = 0x%p)\n", domain, regs);
for (reg = regs; reg->index; reg++) {
sc = ecrt_master_slave_config_err(domain->master, reg->alias,
reg->position, reg->vendor_id, reg->product_code);
if (IS_ERR(sc))
return PTR_ERR(sc);
ret = ecrt_slave_config_reg_pdo_entry(sc, reg->index,
reg->subindex, domain, reg->bit_position);
if (ret < 0)
return ret;
*reg->offset = ret;
}
return 0;
}
/*****************************************************************************/
size_t ecrt_domain_size(const ec_domain_t *domain)
{
return domain->data_size;
}
/*****************************************************************************/
void ecrt_domain_external_memory(ec_domain_t *domain, uint8_t *mem)
{
EC_MASTER_DBG(domain->master, 1, "ecrt_domain_external_memory("
"domain = 0x%p, mem = 0x%p)\n", domain, mem);
ec_mutex_lock(&domain->master->master_mutex);
ec_domain_clear_data(domain);
domain->data = mem;
domain->data_origin = EC_ORIG_EXTERNAL;
ec_mutex_unlock(&domain->master->master_mutex);
}
/*****************************************************************************/
uint8_t *ecrt_domain_data(ec_domain_t *domain)
{
return domain->data;
}
/*****************************************************************************/
void ecrt_domain_process(ec_domain_t *domain)
{
uint16_t working_counter_sum;
ec_datagram_t *datagram;
working_counter_sum = 0x0000;
list_for_each_entry(datagram, &domain->datagrams, list) {
ec_datagram_output_stats(datagram);
if (datagram->state == EC_DATAGRAM_RECEIVED) {
working_counter_sum += datagram->working_counter;
}
}
if (working_counter_sum != domain->working_counter) {
domain->working_counter_changes++;
domain->working_counter = working_counter_sum;
}
if (domain->working_counter_changes &&
jiffies - domain->notify_jiffies > HZ) {
domain->notify_jiffies = jiffies;
if (domain->working_counter_changes == 1) {
EC_MASTER_INFO(domain->master, "Domain %u: Working counter"
" changed to %u/%u.\n", domain->index,
domain->working_counter, domain->expected_working_counter);
} else {
EC_MASTER_INFO(domain->master, "Domain %u: %u working counter"
" changes - now %u/%u.\n", domain->index,
domain->working_counter_changes, domain->working_counter,
domain->expected_working_counter);
}
domain->working_counter_changes = 0;
}
}
/*****************************************************************************/
void ecrt_domain_queue(ec_domain_t *domain)
{
ec_datagram_t *datagram;
list_for_each_entry(datagram, &domain->datagrams, list) {
ec_master_queue_datagram(domain->master, datagram);
}
}
/*****************************************************************************/
void ecrt_domain_state(const ec_domain_t *domain, ec_domain_state_t *state)
{
state->working_counter = domain->working_counter;
if (domain->working_counter) {
if (domain->working_counter == domain->expected_working_counter) {
state->wc_state = EC_WC_COMPLETE;
} else {
state->wc_state = EC_WC_INCOMPLETE;
}
} else {
state->wc_state = EC_WC_ZERO;
}
}
/*****************************************************************************/
/** \cond */
EXPORT_SYMBOL(ecrt_domain_reg_pdo_entry_list);
EXPORT_SYMBOL(ecrt_domain_size);
EXPORT_SYMBOL(ecrt_domain_external_memory);
EXPORT_SYMBOL(ecrt_domain_data);
EXPORT_SYMBOL(ecrt_domain_process);
EXPORT_SYMBOL(ecrt_domain_queue);
EXPORT_SYMBOL(ecrt_domain_state);
/** \endcond */
/*****************************************************************************/