/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsPowerPCQorIQInterCom
*
* @brief Inter-Processor Communication implementation.
*/
/*
* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <libcpu/powerpc-utility.h>
#include <bsp/intercom.h>
#ifdef RTEMS_MULTIPROCESSING
typedef struct {
intercom_packet *head;
intercom_packet *tail;
} mpic_fifo;
static mpic_fifo fifo;
static void mpci_service(intercom_packet *packet, void *arg)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
packet->glue.next = NULL;
if (fifo.head != NULL) {
fifo.tail->glue.next = packet;
} else {
fifo.head = packet;
}
fifo.tail = packet;
rtems_interrupt_enable(level);
rtems_multiprocessing_announce();
}
static void mpci_init(void)
{
qoriq_intercom_service_install(INTERCOM_TYPE_MPCI, mpci_service, NULL);
}
static intercom_packet *packet_of_prefix(rtems_packet_prefix *prefix)
{
return (intercom_packet *) ((char *) prefix - sizeof(intercom_packet));
}
static rtems_packet_prefix *prefix_of_packet(intercom_packet *packet)
{
return (rtems_packet_prefix *) packet->data;
}
static void mpci_get_packet(rtems_packet_prefix **prefix_ptr)
{
intercom_packet *packet = qoriq_intercom_allocate_packet(
INTERCOM_TYPE_MPCI,
INTERCOM_SIZE_512
);
*prefix_ptr = prefix_of_packet(packet);
}
static void mpci_return_packet(rtems_packet_prefix *prefix)
{
intercom_packet *packet = packet_of_prefix(prefix);
qoriq_intercom_free_packet(packet);
}
static void mpci_send_packet(uint32_t destination_node, rtems_packet_prefix *prefix)
{
intercom_packet *packet = packet_of_prefix(prefix);
if (destination_node != MPCI_ALL_NODES) {
qoriq_intercom_send_packet((int) destination_node - 1, packet);
} else {
uint32_t self = ppc_processor_id();
int other = self == 0 ? 1 : 0;
qoriq_intercom_send_packet(other, packet);
}
}
static void mpci_receive_packet(rtems_packet_prefix **prefix_ptr)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
intercom_packet *packet = fifo.head;
if (packet != NULL) {
fifo.head = packet->glue.next;
*prefix_ptr = prefix_of_packet(packet);
} else {
*prefix_ptr = NULL;
}
rtems_interrupt_enable(level);
}
rtems_mpci_table qoriq_intercom_mpci = {
.default_timeout = UINT32_MAX,
.maximum_packet_size = 512,
.initialization = mpci_init,
.get_packet = mpci_get_packet,
.return_packet = mpci_return_packet,
.send_packet = mpci_send_packet,
.receive_packet = mpci_receive_packet
};
#endif /* RTEMS_MULTIPROCESSING */
