forked from Imagelibrary/rtems
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSBSPsPowerPCQorIQInterCom
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*
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* @brief Inter-Processor Communication implementation.
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*/
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/*
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* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <assert.h>
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#include <libcpu/powerpc-utility.h>
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#include <bsp/intercom.h>
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#ifdef RTEMS_MULTIPROCESSING
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typedef struct {
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intercom_packet *head;
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intercom_packet *tail;
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} mpic_fifo;
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static mpic_fifo fifo;
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static void mpci_service(intercom_packet *packet, void *arg)
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{
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rtems_interrupt_level level;
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rtems_interrupt_disable(level);
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packet->glue.next = NULL;
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if (fifo.head != NULL) {
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fifo.tail->glue.next = packet;
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} else {
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fifo.head = packet;
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}
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fifo.tail = packet;
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rtems_interrupt_enable(level);
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rtems_multiprocessing_announce();
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}
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static void mpci_init(void)
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{
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qoriq_intercom_service_install(INTERCOM_TYPE_MPCI, mpci_service, NULL);
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}
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static intercom_packet *packet_of_prefix(rtems_packet_prefix *prefix)
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{
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return (intercom_packet *) ((char *) prefix - sizeof(intercom_packet));
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}
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static rtems_packet_prefix *prefix_of_packet(intercom_packet *packet)
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{
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return (rtems_packet_prefix *) packet->data;
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}
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static void mpci_get_packet(rtems_packet_prefix **prefix_ptr)
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{
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intercom_packet *packet = qoriq_intercom_allocate_packet(
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INTERCOM_TYPE_MPCI,
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INTERCOM_SIZE_512
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);
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*prefix_ptr = prefix_of_packet(packet);
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}
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static void mpci_return_packet(rtems_packet_prefix *prefix)
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{
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intercom_packet *packet = packet_of_prefix(prefix);
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qoriq_intercom_free_packet(packet);
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}
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static void mpci_send_packet(uint32_t destination_node, rtems_packet_prefix *prefix)
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{
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intercom_packet *packet = packet_of_prefix(prefix);
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if (destination_node != MPCI_ALL_NODES) {
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qoriq_intercom_send_packet((int) destination_node - 1, packet);
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} else {
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uint32_t self = ppc_processor_id();
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int other = self == 0 ? 1 : 0;
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qoriq_intercom_send_packet(other, packet);
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}
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}
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static void mpci_receive_packet(rtems_packet_prefix **prefix_ptr)
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{
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rtems_interrupt_level level;
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rtems_interrupt_disable(level);
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intercom_packet *packet = fifo.head;
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if (packet != NULL) {
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fifo.head = packet->glue.next;
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*prefix_ptr = prefix_of_packet(packet);
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} else {
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*prefix_ptr = NULL;
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}
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rtems_interrupt_enable(level);
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}
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rtems_mpci_table qoriq_intercom_mpci = {
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.default_timeout = UINT32_MAX,
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.maximum_packet_size = 512,
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.initialization = mpci_init,
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.get_packet = mpci_get_packet,
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.return_packet = mpci_return_packet,
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.send_packet = mpci_send_packet,
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.receive_packet = mpci_receive_packet
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};
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#endif /* RTEMS_MULTIPROCESSING */
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