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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018/10/28 Bernard The unify RISC-V porting code.
* 2024/07/08 Shell Using CPUTIME as tick
*/
#include <rthw.h>
#include <rtthread.h>
#include <drivers/cputime.h>
#include <encoding.h>
#include "sbi.h"
#ifdef RT_USING_KTIME
#include <ktime.h>
#endif
static volatile unsigned long tick_cycles = 0;
int tick_isr(void)
{
rt_tick_increase();
sbi_set_timer(clock_cpu_gettime() + tick_cycles);
return 0;
}
/* BSP should config clockbase frequency */
RT_STATIC_ASSERT(defined_clockbase_freq, CPUTIME_TIMER_FREQ != 0);
/* Sets and enable the timer interrupt */
int rt_hw_tick_init(void)
{
/* calculate the tick cycles */
tick_cycles = CPUTIME_TIMER_FREQ / RT_TICK_PER_SECOND;
/* Clear the Supervisor-Timer bit in SIE */
clear_csr(sie, SIP_STIP);
/* Init riscv timer */
riscv_cputime_init();
/* Set timer */
sbi_set_timer(clock_cpu_gettime() + tick_cycles);
#ifdef RT_USING_KTIME
rt_ktime_cputimer_init();
#endif
/* Enable the Supervisor-Timer bit in SIE */
set_csr(sie, SIP_STIP);
return 0;
}
/**
* This function will delay for some us.
*
* @param us the delay time of us
*/
void rt_hw_us_delay(rt_uint32_t us)
{
unsigned long start_time;
unsigned long end_time;
unsigned long run_time;
start_time = clock_cpu_gettime();
end_time = start_time + us * (CPUTIME_TIMER_FREQ / 1000000);
do
{
run_time = clock_cpu_gettime();
} while(run_time < end_time);
}
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