forked from Imagelibrary/rtems
255 lines
6.5 KiB
C
255 lines
6.5 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* @ingroup bsp_clock
|
|
*
|
|
* @brief Clock Tick Device Driver Shell
|
|
*/
|
|
|
|
/*
|
|
* COPYRIGHT (c) 1989-2014.
|
|
* On-Line Applications Research Corporation (OAR).
|
|
*
|
|
* 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 <stdlib.h>
|
|
|
|
#include <bsp.h>
|
|
#include <rtems/clockdrv.h>
|
|
#include <rtems/score/percpu.h>
|
|
#include <rtems/score/smpimpl.h>
|
|
#include <rtems/score/timecounter.h>
|
|
#include <rtems/score/thread.h>
|
|
#include <rtems/score/watchdogimpl.h>
|
|
|
|
#ifdef Clock_driver_nanoseconds_since_last_tick
|
|
#error "Update driver to use the timecounter instead of nanoseconds extension"
|
|
#endif
|
|
|
|
/**
|
|
* @defgroup bsp_clock Clock Support
|
|
*
|
|
* @ingroup RTEMSBSPsShared
|
|
*
|
|
* @brief Clock support
|
|
*
|
|
*/
|
|
#if CLOCK_DRIVER_USE_FAST_IDLE && CLOCK_DRIVER_ISRS_PER_TICK
|
|
#error "Fast Idle PLUS n ISRs per tick is not supported"
|
|
#endif
|
|
|
|
/**
|
|
* @brief Do nothing by default.
|
|
*/
|
|
#ifndef Clock_driver_support_install_isr
|
|
#define Clock_driver_support_install_isr(isr)
|
|
#endif
|
|
|
|
/**
|
|
* @brief This method is rarely used so default it.
|
|
*/
|
|
#ifndef Clock_driver_support_find_timer
|
|
#define Clock_driver_support_find_timer()
|
|
#endif
|
|
|
|
/**
|
|
* @brief Do nothing by default.
|
|
*/
|
|
#ifndef Clock_driver_support_at_tick
|
|
#define Clock_driver_support_at_tick()
|
|
#endif
|
|
|
|
/**
|
|
* @brief Do nothing by default.
|
|
*/
|
|
#ifndef Clock_driver_support_set_interrupt_affinity
|
|
#define Clock_driver_support_set_interrupt_affinity(online_processors)
|
|
#endif
|
|
|
|
/*
|
|
* A specialized clock driver may use for example rtems_timecounter_tick_simple()
|
|
* instead of the default.
|
|
*/
|
|
#ifndef Clock_driver_timecounter_tick
|
|
static void Clock_driver_timecounter_tick( void )
|
|
{
|
|
#if defined(CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER)
|
|
rtems_clock_tick();
|
|
#elif defined(RTEMS_SMP) && defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR)
|
|
uint32_t cpu_max;
|
|
uint32_t cpu_index;
|
|
|
|
cpu_max = _SMP_Get_processor_maximum();
|
|
|
|
for ( cpu_index = 0 ; cpu_index < cpu_max ; ++cpu_index ) {
|
|
Per_CPU_Control *cpu;
|
|
|
|
cpu = _Per_CPU_Get_by_index( cpu_index );
|
|
|
|
if ( _Per_CPU_Is_boot_processor( cpu ) ) {
|
|
rtems_timecounter_tick();
|
|
} else if ( _Processor_mask_Is_set( _SMP_Get_online_processors(), cpu_index ) ) {
|
|
_Watchdog_Tick( cpu );
|
|
}
|
|
}
|
|
#else
|
|
rtems_timecounter_tick();
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief ISRs until next clock tick
|
|
*/
|
|
#if CLOCK_DRIVER_ISRS_PER_TICK
|
|
volatile uint32_t Clock_driver_isrs;
|
|
#endif
|
|
|
|
/**
|
|
* @brief Clock ticks since initialization
|
|
*/
|
|
volatile uint32_t Clock_driver_ticks;
|
|
|
|
#ifdef Clock_driver_support_shutdown_hardware
|
|
#error "Clock_driver_support_shutdown_hardware() is no longer supported"
|
|
#endif
|
|
|
|
/**
|
|
* @brief Clock_isr
|
|
*
|
|
* This is the clock tick interrupt handler.
|
|
*
|
|
* @param vector Vector number.
|
|
*/
|
|
#if defined(BSP_FEATURE_IRQ_EXTENSION) || \
|
|
(CPU_SIMPLE_VECTORED_INTERRUPTS != TRUE)
|
|
void Clock_isr(void *arg);
|
|
void Clock_isr(void *arg)
|
|
{
|
|
#else
|
|
rtems_isr Clock_isr(rtems_vector_number vector);
|
|
rtems_isr Clock_isr(
|
|
rtems_vector_number vector
|
|
)
|
|
{
|
|
#endif
|
|
/*
|
|
* Accurate count of ISRs
|
|
*/
|
|
Clock_driver_ticks += 1;
|
|
|
|
#if CLOCK_DRIVER_USE_FAST_IDLE
|
|
{
|
|
Clock_driver_timecounter_tick();
|
|
|
|
if (_SMP_Get_processor_maximum() == 1) {
|
|
struct timecounter *tc;
|
|
uint64_t us_per_tick;
|
|
uint32_t interval;
|
|
Per_CPU_Control *cpu_self;
|
|
|
|
cpu_self = _Per_CPU_Get();
|
|
tc = _Timecounter;
|
|
us_per_tick = rtems_configuration_get_microseconds_per_tick();
|
|
interval = (uint32_t) ((tc->tc_frequency * us_per_tick) / 1000000);
|
|
|
|
while (
|
|
cpu_self->thread_dispatch_disable_level == cpu_self->isr_nest_level
|
|
&& cpu_self->heir == cpu_self->executing
|
|
&& cpu_self->executing->is_idle
|
|
) {
|
|
ISR_lock_Context lock_context;
|
|
|
|
_Timecounter_Acquire(&lock_context);
|
|
_Timecounter_Tick_simple(
|
|
interval,
|
|
(*tc->tc_get_timecount)(tc),
|
|
&lock_context
|
|
);
|
|
}
|
|
}
|
|
|
|
Clock_driver_support_at_tick();
|
|
}
|
|
#else
|
|
/*
|
|
* Do the hardware specific per-tick action.
|
|
*
|
|
* The counter/timer may or may not be set to automatically reload.
|
|
*/
|
|
Clock_driver_support_at_tick();
|
|
|
|
#if CLOCK_DRIVER_ISRS_PER_TICK
|
|
/*
|
|
* The driver is multiple ISRs per clock tick.
|
|
*/
|
|
if ( !Clock_driver_isrs ) {
|
|
Clock_driver_timecounter_tick();
|
|
|
|
Clock_driver_isrs = CLOCK_DRIVER_ISRS_PER_TICK_VALUE;
|
|
}
|
|
Clock_driver_isrs--;
|
|
#else
|
|
/*
|
|
* The driver is one ISR per clock tick.
|
|
*/
|
|
Clock_driver_timecounter_tick();
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
void _Clock_Initialize( void )
|
|
{
|
|
Clock_driver_ticks = 0;
|
|
|
|
/*
|
|
* Find timer -- some BSPs search buses for hardware timer
|
|
*/
|
|
Clock_driver_support_find_timer();
|
|
|
|
/*
|
|
* Install vector
|
|
*/
|
|
Clock_driver_support_install_isr( Clock_isr );
|
|
|
|
#ifdef RTEMS_SMP
|
|
Clock_driver_support_set_interrupt_affinity(
|
|
_SMP_Get_online_processors()
|
|
);
|
|
#endif
|
|
|
|
/*
|
|
* Now initialize the hardware that is the source of the tick ISR.
|
|
*/
|
|
Clock_driver_support_initialize_hardware();
|
|
|
|
/*
|
|
* If we are counting ISRs per tick, then initialize the counter.
|
|
*/
|
|
#if CLOCK_DRIVER_ISRS_PER_TICK
|
|
Clock_driver_isrs = CLOCK_DRIVER_ISRS_PER_TICK_VALUE;
|
|
#endif
|
|
}
|