forked from Imagelibrary/rtems
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* @ingroup raspberrypi
|
|
*
|
|
* @brief Raspberry pi SMP management functions provided to SuperCore
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2016 Pavel Pisa <pisa@cmp.felk.cvut.cz>
|
|
*
|
|
* Czech Technical University in Prague
|
|
* Zikova 1903/4
|
|
* 166 36 Praha 6
|
|
* Czech Republic
|
|
*
|
|
* Reuses some ideas from Rohini Kulkarni <krohini1593@gmail.com>
|
|
* GSoC 2015 project and Altera Cyclone-V SMP code
|
|
* by embedded brains GmbH & Co. KG
|
|
*
|
|
* 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 <rtems/score/smpimpl.h>
|
|
|
|
#include <bsp/start.h>
|
|
#include <bsp/raspberrypi.h>
|
|
#include <bsp.h>
|
|
#include <bsp/arm-cp15-start.h>
|
|
#include <libcpu/arm-cp15.h>
|
|
#include <rtems.h>
|
|
#include <bsp/irq-generic.h>
|
|
#include <assert.h>
|
|
|
|
bool _CPU_SMP_Start_processor( uint32_t cpu_index )
|
|
{
|
|
bool started;
|
|
uint32_t cpu_index_self = _SMP_Get_current_processor();
|
|
|
|
if (cpu_index != cpu_index_self) {
|
|
|
|
BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) = (uint32_t)_start;
|
|
_ARM_Send_event();
|
|
|
|
/*
|
|
* Wait for secondary processor to complete its basic initialization so
|
|
* that we can enable the unified L2 cache.
|
|
*/
|
|
started = _Per_CPU_State_wait_for_non_initial_state(cpu_index, 0);
|
|
} else {
|
|
started = false;
|
|
}
|
|
|
|
return started;
|
|
}
|
|
|
|
uint32_t _CPU_SMP_Initialize(void)
|
|
{
|
|
return 4;
|
|
}
|
|
|
|
void _CPU_SMP_Finalize_initialization( uint32_t cpu_count )
|
|
{
|
|
/* Do nothing */
|
|
}
|
|
|
|
void _CPU_SMP_Prepare_start_multitasking( void )
|
|
{
|
|
/* Do nothing */
|
|
}
|
|
|
|
void _CPU_SMP_Send_interrupt( uint32_t target_cpu_index )
|
|
{
|
|
/* Generates IPI */
|
|
BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE +
|
|
0x10 * target_cpu_index) = 0x1;
|
|
}
|