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timer.h
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53 lines (38 loc) · 1.35 KB
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/*
Simple machine mode timer driver for RISC-V standard timer.
SPDX-License-Identifier: Unlicense
(https://five-embeddev.com/)
*/
#ifndef TIMER_H
#define TIMER_H
#include <stdint.h>
#ifndef RISCV_CLINT_ADDR
#define RISCV_CLINT_ADDR 0x2000000UL
#endif
#ifndef RISCV_MTIMECMP_ADDR
#define RISCV_MTIMECMP_ADDR (RISCV_CLINT_ADDR + 0x4000UL)
#endif
#ifndef RISCV_MTIME_ADDR
#define RISCV_MTIME_ADDR (RISCV_CLINT_ADDR + 0xBFF8UL)
#endif
#ifndef MTIME_FREQ_HZ
// Timer for HiFive board
#define MTIME_FREQ_HZ 32768
#endif
#define MTIMER_SECONDS_TO_CLOCKS(SEC) \
((uint64_t)(((SEC) * (MTIME_FREQ_HZ))))
#define MTIMER_MSEC_TO_CLOCKS(MSEC) \
((uint64_t)(((MSEC) * (MTIME_FREQ_HZ)) / 1000))
#define MTIMER_USEC_TO_CLOCKS(USEC) \
((uint64_t)(((USEC) * (MTIME_FREQ_HZ)) / 1000000))
/** Set the raw time compare point in system timer clocks.
* @param clock_offset Time relative to current mtime when
* @note The time range of the 64 bit timer is large enough not to consider a wrap around of mtime.
* An interrupt will be generated at mtime + clock_offset.
* See http://five-embeddev.com/riscv-isa-manual/latest/machine.html#machine-timer-registers-mtime-and-mtimecmp
*/
void mtimer_set_raw_time_cmp(uint64_t clock_offset);
/** Read the raw time of the system timer in system timer clocks
*/
uint64_t mtimer_get_raw_time(void);
#endif// #ifdef TIMER_H