82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* Copyright (c) 2006-2024, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2024/01/11 flyingcys The first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <encoding.h>
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#include "tick.h"
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static volatile rt_uint64_t time_elapsed = 0;
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static volatile unsigned long tick_cycles = 0;
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#define CLINT_BASE (PLIC_PHY_ADDR + 0x4000000UL)
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static volatile rt_uint32_t *mtimecmp_l = (volatile rt_uint32_t *)(CLINT_BASE + 0x4000UL);
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static volatile rt_uint32_t *mtimecmp_h = (volatile rt_uint32_t *)(CLINT_BASE + 0x4004UL);
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rt_inline void set_ticks(rt_uint64_t value)
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{
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*mtimecmp_l = 0xFFFFFFFF;
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*mtimecmp_h = (rt_uint32_t)(value >> 32);
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*mtimecmp_l = (rt_uint32_t)(value & 0xFFFFFFFF);
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}
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static rt_uint64_t get_ticks(void)
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{
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__asm__ __volatile__(
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"rdtime %0"
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: "=r"(time_elapsed));
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return time_elapsed;
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}
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int rt_hw_tick_isr(void)
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{
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rt_tick_increase();
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set_ticks(get_ticks() + tick_cycles);
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return 0;
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}
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/* Sets and enable the timer interrupt */
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int rt_hw_tick_init(void)
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{
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/* Clear the Machine-Timer bit in MIE */
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clear_csr(mie, MIP_MTIP);
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tick_cycles = TIMER_CLK_FREQ / RT_TICK_PER_SECOND;
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set_ticks(get_ticks() + tick_cycles);
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rt_kprintf("[rt_hw_tick_init] time_elapsed: %d tick_cycles:%d\n", time_elapsed, tick_cycles);
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/* Enable the Machine-Timer bit in MIE */
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set_csr(mie, MIP_MTIP);
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return 0;
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}
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/**
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* This function will delay for some us.
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*
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* @param us the delay time of us
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*/
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void rt_hw_us_delay(rt_uint32_t us)
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{
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unsigned long start_time;
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unsigned long end_time;
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unsigned long run_time;
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start_time = get_ticks();
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end_time = start_time + us * (TIMER_CLK_FREQ / 1000000);
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do{
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run_time = get_ticks();
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} while(run_time < end_time);
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}
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