/******************************************************************************
*
* $Id$
*
* 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
*
* Using the EtherCAT technology and brand is permitted in compliance with
* the industrial property and similar rights of Beckhoff Automation GmbH.
*
*****************************************************************************/
/** \file
* Vendor specific over EtherCAT protocol handler functions.
*/
/*****************************************************************************/
#include <linux/module.h>
#include "master.h"
#include "slave_config.h"
#include "mailbox.h"
#include "voe_handler.h"
/** VoE mailbox type.
*/
#define EC_MBOX_TYPE_VOE 0x0f
/** VoE header size.
*/
#define EC_VOE_HEADER_SIZE 6
/** VoE response timeout in [ms].
*/
#define EC_VOE_RESPONSE_TIMEOUT 500
/*****************************************************************************/
void ec_voe_handler_state_write_start(ec_voe_handler_t *);
void ec_voe_handler_state_write_response(ec_voe_handler_t *);
void ec_voe_handler_state_read_start(ec_voe_handler_t *);
void ec_voe_handler_state_read_check(ec_voe_handler_t *);
void ec_voe_handler_state_read_response(ec_voe_handler_t *);
void ec_voe_handler_state_read_nosync_start(ec_voe_handler_t *);
void ec_voe_handler_state_read_nosync_response(ec_voe_handler_t *);
void ec_voe_handler_state_end(ec_voe_handler_t *);
void ec_voe_handler_state_error(ec_voe_handler_t *);
/*****************************************************************************/
/** VoE handler constructor.
*
* \return Return value of ec_datagram_prealloc().
*/
int ec_voe_handler_init(
ec_voe_handler_t *voe, /**< VoE handler. */
ec_slave_config_t *sc, /**< Parent slave configuration. */
size_t size /**< Size of memory to reserve. */
)
{
voe->config = sc;
voe->vendor_id = 0x00000000;
voe->vendor_type = 0x0000;
voe->data_size = 0;
voe->dir = EC_DIR_INVALID;
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_INIT;
ec_datagram_init(&voe->datagram);
return ec_datagram_prealloc(&voe->datagram,
size + EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE);
}
/*****************************************************************************/
/** VoE handler destructor.
*/
void ec_voe_handler_clear(
ec_voe_handler_t *voe /**< VoE handler. */
)
{
ec_datagram_clear(&voe->datagram);
}
/*****************************************************************************/
/** Get usable memory size.
*/
size_t ec_voe_handler_mem_size(
const ec_voe_handler_t *voe /**< VoE handler. */
)
{
if (voe->datagram.mem_size >= EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE)
return voe->datagram.mem_size -
(EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE);
else
return 0;
}
/*****************************************************************************
* Application interface.
****************************************************************************/
void ecrt_voe_handler_send_header(ec_voe_handler_t *voe, uint32_t vendor_id,
uint16_t vendor_type)
{
voe->vendor_id = vendor_id;
voe->vendor_type = vendor_type;
}
/*****************************************************************************/
void ecrt_voe_handler_received_header(const ec_voe_handler_t *voe,
uint32_t *vendor_id, uint16_t *vendor_type)
{
uint8_t *header = voe->datagram.data + EC_MBOX_HEADER_SIZE;
if (vendor_id)
*vendor_id = EC_READ_U32(header);
if (vendor_type)
*vendor_type = EC_READ_U16(header + 4);
}
/*****************************************************************************/
uint8_t *ecrt_voe_handler_data(ec_voe_handler_t *voe)
{
return voe->datagram.data + EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE;
}
/*****************************************************************************/
size_t ecrt_voe_handler_data_size(const ec_voe_handler_t *voe)
{
return voe->data_size;
}
/*****************************************************************************/
void ecrt_voe_handler_read(ec_voe_handler_t *voe)
{
voe->dir = EC_DIR_INPUT;
voe->state = ec_voe_handler_state_read_start;
voe->request_state = EC_INT_REQUEST_BUSY;
}
/*****************************************************************************/
void ecrt_voe_handler_read_nosync(ec_voe_handler_t *voe)
{
voe->dir = EC_DIR_INPUT;
voe->state = ec_voe_handler_state_read_nosync_start;
voe->request_state = EC_INT_REQUEST_BUSY;
}
/*****************************************************************************/
void ecrt_voe_handler_write(ec_voe_handler_t *voe, size_t size)
{
voe->dir = EC_DIR_OUTPUT;
voe->data_size = size;
voe->state = ec_voe_handler_state_write_start;
voe->request_state = EC_INT_REQUEST_BUSY;
}
/*****************************************************************************/
ec_request_state_t ecrt_voe_handler_execute(ec_voe_handler_t *voe)
{
if (voe->config->slave) { // FIXME locking?
voe->state(voe);
if (voe->request_state == EC_INT_REQUEST_BUSY)
ec_master_queue_datagram(voe->config->master, &voe->datagram);
} else {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
}
return ec_request_state_translation_table[voe->request_state];
}
/******************************************************************************
* State functions.
*****************************************************************************/
/** Start writing VoE data.
*/
void ec_voe_handler_state_write_start(ec_voe_handler_t *voe)
{
ec_slave_t *slave = voe->config->slave;
uint8_t *data;
if (slave->master->debug_level) {
EC_DBG("Writing %u bytes of VoE data to slave %u.\n",
voe->data_size, slave->ring_position);
ec_print_data(ecrt_voe_handler_data(voe), voe->data_size);
}
if (!(slave->sii.mailbox_protocols & EC_MBOX_VOE)) {
EC_ERR("Slave %u does not support VoE!\n", slave->ring_position);
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
data = ec_slave_mbox_prepare_send(slave, &voe->datagram,
EC_MBOX_TYPE_VOE, EC_VOE_HEADER_SIZE + voe->data_size);
if (IS_ERR(data)) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
EC_WRITE_U32(data, voe->vendor_id);
EC_WRITE_U16(data + 4, voe->vendor_type);
voe->retries = EC_FSM_RETRIES;
voe->jiffies_start = jiffies;
voe->state = ec_voe_handler_state_write_response;
}
/*****************************************************************************/
/** Wait for the mailbox response.
*/
void ec_voe_handler_state_write_response(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
if (datagram->state == EC_DATAGRAM_TIMED_OUT && voe->retries--)
return;
if (datagram->state != EC_DATAGRAM_RECEIVED) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Failed to receive VoE write request datagram for"
" slave %u (datagram state %u).\n",
slave->ring_position, datagram->state);
return;
}
if (datagram->working_counter != 1) {
if (!datagram->working_counter) {
unsigned long diff_ms =
(jiffies - voe->jiffies_start) * 1000 / HZ;
if (diff_ms < EC_VOE_RESPONSE_TIMEOUT) {
if (slave->master->debug_level) {
EC_DBG("Slave %u did not respond to VoE write request. "
"Retrying after %u ms...\n",
slave->ring_position, (u32) diff_ms);
}
// no response; send request datagram again
return;
}
}
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Reception of VoE write request failed on slave %u: ",
slave->ring_position);
ec_datagram_print_wc_error(datagram);
return;
}
if (voe->config->master->debug_level)
EC_DBG("VoE write request successful.\n");
voe->request_state = EC_INT_REQUEST_SUCCESS;
voe->state = ec_voe_handler_state_end;
}
/*****************************************************************************/
/** Start reading VoE data.
*/
void ec_voe_handler_state_read_start(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
if (slave->master->debug_level)
EC_DBG("Reading VoE data to slave %u.\n", slave->ring_position);
if (!(slave->sii.mailbox_protocols & EC_MBOX_VOE)) {
EC_ERR("Slave %u does not support VoE!\n", slave->ring_position);
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
ec_slave_mbox_prepare_check(slave, datagram); // can not fail.
voe->jiffies_start = jiffies;
voe->retries = EC_FSM_RETRIES;
voe->state = ec_voe_handler_state_read_check;
}
/*****************************************************************************/
/** Check for new data in the mailbox.
*/
void ec_voe_handler_state_read_check(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
if (datagram->state == EC_DATAGRAM_TIMED_OUT && voe->retries--)
return;
if (datagram->state != EC_DATAGRAM_RECEIVED) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Failed to receive VoE mailbox check datagram from slave %u"
" (datagram state %u).\n",
slave->ring_position, datagram->state);
return;
}
if (datagram->working_counter != 1) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Reception of VoE mailbox check"
" datagram failed on slave %u: ", slave->ring_position);
ec_datagram_print_wc_error(datagram);
return;
}
if (!ec_slave_mbox_check(datagram)) {
unsigned long diff_ms =
(datagram->jiffies_received - voe->jiffies_start) * 1000 / HZ;
if (diff_ms >= EC_VOE_RESPONSE_TIMEOUT) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Timeout while waiting for VoE data on "
"slave %u.\n", slave->ring_position);
return;
}
ec_slave_mbox_prepare_check(slave, datagram); // can not fail.
voe->retries = EC_FSM_RETRIES;
return;
}
// Fetch response
ec_slave_mbox_prepare_fetch(slave, datagram); // can not fail.
voe->retries = EC_FSM_RETRIES;
voe->state = ec_voe_handler_state_read_response;
}
/*****************************************************************************/
/** Read the pending mailbox data.
*/
void ec_voe_handler_state_read_response(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
ec_master_t *master = voe->config->master;
uint8_t *data, mbox_prot;
size_t rec_size;
if (datagram->state == EC_DATAGRAM_TIMED_OUT && voe->retries--)
return;
if (datagram->state != EC_DATAGRAM_RECEIVED) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Failed to receive VoE read datagram for"
" slave %u (datagram state %u).\n",
slave->ring_position, datagram->state);
return;
}
if (datagram->working_counter != 1) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Reception of VoE read response failed on slave %u: ",
slave->ring_position);
ec_datagram_print_wc_error(datagram);
return;
}
data = ec_slave_mbox_fetch(slave, datagram, &mbox_prot, &rec_size);
if (IS_ERR(data)) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
if (mbox_prot != EC_MBOX_TYPE_VOE) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_WARN("Received mailbox protocol 0x%02X as response.\n", mbox_prot);
ec_print_data(data, rec_size);
return;
}
if (rec_size < EC_VOE_HEADER_SIZE) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Received VoE header is incomplete (%u bytes)!\n", rec_size);
return;
}
if (master->debug_level) {
EC_DBG("VoE data:\n");
ec_print_data(data, rec_size);
}
voe->data_size = rec_size - EC_VOE_HEADER_SIZE;
voe->request_state = EC_INT_REQUEST_SUCCESS;
voe->state = ec_voe_handler_state_end; // success
}
/*****************************************************************************/
/** Start reading VoE data without sending a sync message before.
*/
void ec_voe_handler_state_read_nosync_start(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
if (slave->master->debug_level)
EC_DBG("Reading VoE data to slave %u.\n", slave->ring_position);
if (!(slave->sii.mailbox_protocols & EC_MBOX_VOE)) {
EC_ERR("Slave %u does not support VoE!\n", slave->ring_position);
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
ec_slave_mbox_prepare_fetch(slave, datagram); // can not fail.
voe->jiffies_start = jiffies;
voe->retries = EC_FSM_RETRIES;
voe->state = ec_voe_handler_state_read_nosync_response;
}
/*****************************************************************************/
/** Read the pending mailbox data without sending a sync message before. This
* might lead to an empty reponse from the client.
*/
void ec_voe_handler_state_read_nosync_response(ec_voe_handler_t *voe)
{
ec_datagram_t *datagram = &voe->datagram;
ec_slave_t *slave = voe->config->slave;
ec_master_t *master = voe->config->master;
uint8_t *data, mbox_prot;
size_t rec_size;
if (datagram->state == EC_DATAGRAM_TIMED_OUT && voe->retries--)
return;
if (datagram->state != EC_DATAGRAM_RECEIVED) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Failed to receive VoE read datagram for"
" slave %u (datagram state %u).\n",
slave->ring_position, datagram->state);
return;
}
if (datagram->working_counter == 0) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
if (master->debug_level)
EC_DBG("Slave %u did not send VoE data.", slave->ring_position);
return;
}
if (datagram->working_counter != 1) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_WARN("Reception of VoE read response failed on slave %u: ",
slave->ring_position);
ec_datagram_print_wc_error(datagram);
return;
}
if (!(data = ec_slave_mbox_fetch(slave, datagram,
&mbox_prot, &rec_size))) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
return;
}
if (mbox_prot != EC_MBOX_TYPE_VOE) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_WARN("Received mailbox protocol 0x%02X as response.\n", mbox_prot);
ec_print_data(data, rec_size);
return;
}
if (rec_size < EC_VOE_HEADER_SIZE) {
voe->state = ec_voe_handler_state_error;
voe->request_state = EC_INT_REQUEST_FAILURE;
EC_ERR("Received VoE header is incomplete (%u bytes)!\n", rec_size);
return;
}
if (master->debug_level) {
EC_DBG("VoE data:\n");
ec_print_data(data, rec_size);
}
voe->data_size = rec_size - EC_VOE_HEADER_SIZE;
voe->request_state = EC_INT_REQUEST_SUCCESS;
voe->state = ec_voe_handler_state_end; // success
}
/*****************************************************************************/
/** Successful termination state function.
*/
void ec_voe_handler_state_end(ec_voe_handler_t *voe)
{
}
/*****************************************************************************/
/** Failure termination state function.
*/
void ec_voe_handler_state_error(ec_voe_handler_t *voe)
{
}
/*****************************************************************************/
/** \cond */
EXPORT_SYMBOL(ecrt_voe_handler_send_header);
EXPORT_SYMBOL(ecrt_voe_handler_received_header);
EXPORT_SYMBOL(ecrt_voe_handler_data);
EXPORT_SYMBOL(ecrt_voe_handler_data_size);
EXPORT_SYMBOL(ecrt_voe_handler_read);
EXPORT_SYMBOL(ecrt_voe_handler_write);
EXPORT_SYMBOL(ecrt_voe_handler_execute);
/** \endcond */
/*****************************************************************************/