66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include <types.h>
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#ifndef CLOCK_H
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#define CLOCK_H
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#include <linux/time.h>
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#define CLOCKSOURCE_MASK(bits) (uint64_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
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struct clocksource {
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uint32_t shift;
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uint32_t mult;
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uint64_t (*read)(void);
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uint64_t cycle_last;
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uint64_t mask;
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};
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static inline uint32_t cyc2ns(struct clocksource *cs, uint64_t cycles)
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{
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uint64_t ret = cycles;
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ret = (ret * cs->mult) >> cs->shift;
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return ret;
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}
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int init_clock(struct clocksource *);
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uint64_t get_time_ns(void);
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void clocks_calc_mult_shift(uint32_t *mult, uint32_t *shift, uint32_t from, uint32_t to, uint32_t maxsec);
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uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant);
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int is_timeout(uint64_t start_ns, uint64_t time_offset_ns);
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int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns);
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// void udelay(unsigned long usecs);
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void ndelay(unsigned long nsecs);
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void mdelay(unsigned long msecs);
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#define SECOND ((uint64_t)(1000 * 1000 * 1000))
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#define MSECOND ((uint64_t)(1000 * 1000))
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#define USECOND ((uint64_t)(1000))
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/*
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* Convenience wrapper to implement a typical polling loop with
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* timeout. returns 0 if the condition became true within the
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* timeout or -ETIMEDOUT otherwise
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*/
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#define wait_on_timeout(timeout, condition) \
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({ \
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int __ret = 0; \
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uint64_t __to_start = get_time_ns(); \
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\
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while (!(condition)) { \
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if (is_timeout(__to_start, (timeout))) { \
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__ret = -ETIMEDOUT; \
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break; \
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} \
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} \
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__ret; \
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})
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#endif /* CLOCK_H */
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