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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * RISC-V Arch Timer(sstc) specific interface4 *5 * Copyright (c) 2024 Intel Corporation6 */7 8#ifndef SELFTEST_KVM_ARCH_TIMER_H9#define SELFTEST_KVM_ARCH_TIMER_H10 11#include <asm/csr.h>12#include <asm/vdso/processor.h>13 14static unsigned long timer_freq;15 16#define msec_to_cycles(msec) \17 ((timer_freq) * (uint64_t)(msec) / 1000)18 19#define usec_to_cycles(usec) \20 ((timer_freq) * (uint64_t)(usec) / 1000000)21 22#define cycles_to_usec(cycles) \23 ((uint64_t)(cycles) * 1000000 / (timer_freq))24 25static inline uint64_t timer_get_cycles(void)26{27 return csr_read(CSR_TIME);28}29 30static inline void timer_set_cmp(uint64_t cval)31{32 csr_write(CSR_STIMECMP, cval);33}34 35static inline uint64_t timer_get_cmp(void)36{37 return csr_read(CSR_STIMECMP);38}39 40static inline void timer_irq_enable(void)41{42 csr_set(CSR_SIE, IE_TIE);43}44 45static inline void timer_irq_disable(void)46{47 csr_clear(CSR_SIE, IE_TIE);48}49 50static inline void timer_set_next_cmp_ms(uint32_t msec)51{52 uint64_t now_ct = timer_get_cycles();53 uint64_t next_ct = now_ct + msec_to_cycles(msec);54 55 timer_set_cmp(next_ct);56}57 58static inline void __delay(uint64_t cycles)59{60 uint64_t start = timer_get_cycles();61 62 while ((timer_get_cycles() - start) < cycles)63 cpu_relax();64}65 66static inline void udelay(unsigned long usec)67{68 __delay(usec_to_cycles(usec));69}70 71#endif /* SELFTEST_KVM_ARCH_TIMER_H */72