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/*
* Copyright (c) 2011, 2018 Sebastian Huber. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp/clock-armv7m.h>
#include <rtems.h>
#include <rtems/sysinit.h>
#ifdef ARM_MULTILIB_ARCH_V7M
/* This is defined in dev/clock/clockimpl.h */
static void Clock_isr(void *arg);
ARMV7M_Timecounter _ARMV7M_TC;
static uint32_t _ARMV7M_TC_get_timecount(struct timecounter *base)
{
return _ARMV7M_Clock_counter((ARMV7M_Timecounter *) base);
}
static void _ARMV7M_Clock_handler(void)
{
_ARMV7M_Interrupt_service_enter();
Clock_isr(NULL);
_ARMV7M_Interrupt_service_leave();
}
static void _ARMV7M_Clock_handler_install(void)
{
_ARMV7M_Set_exception_priority_and_handler(
ARMV7M_VECTOR_SYSTICK,
BSP_ARMV7M_SYSTICK_PRIORITY,
_ARMV7M_Clock_handler
);
}
static void _ARMV7M_Clock_initialize(void)
{
volatile ARMV7M_Systick *systick;
ARMV7M_Timecounter *tc;
systick = _ARMV7M_Systick;
tc = &_ARMV7M_TC;
systick->csr = ARMV7M_SYSTICK_CSR_ENABLE
| ARMV7M_SYSTICK_CSR_TICKINT
| ARMV7M_SYSTICK_CSR_CLKSOURCE;
tc->base.tc_get_timecount = _ARMV7M_TC_get_timecount;
tc->base.tc_counter_mask = 0xffffffff;
tc->base.tc_frequency = _ARMV7M_Clock_frequency();
tc->base.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(&tc->base);
}
static void _ARMV7M_Clock_initialize_early(void)
{
volatile ARMV7M_Systick *systick;
uint32_t us_per_tick;
uint64_t freq;
uint32_t interval;
systick = _ARMV7M_Systick;
us_per_tick = rtems_configuration_get_microseconds_per_tick();
freq = _ARMV7M_Clock_frequency();
interval = (uint32_t) ((freq * us_per_tick) / 1000000);
systick->rvr = interval;
systick->cvr = 0;
systick->csr = ARMV7M_SYSTICK_CSR_ENABLE | ARMV7M_SYSTICK_CSR_CLKSOURCE;
}
RTEMS_SYSINIT_ITEM(
_ARMV7M_Clock_initialize_early,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
#define Clock_driver_support_initialize_hardware() \
_ARMV7M_Clock_initialize()
#define Clock_driver_support_install_isr(isr) \
_ARMV7M_Clock_handler_install()
/* Include shared source clock driver code */
#include "../../../shared/dev/clock/clockimpl.h"
#endif /* ARM_MULTILIB_ARCH_V7M */
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