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// SPDX-License-Identifier: Apache-2.0
/*
* Timebase helpers.
*
* Note: Only use after the TODs are in sync !
*
* Copyright 2013-2016 IBM Corp.
*/
#ifndef __TIME_H
#define __TIME_H
#include <time.h>
#ifndef __TEST__
static inline unsigned long mftb(void)
{
unsigned long tb;
/* We use a memory clobber to avoid this being
* moved in the instruction stream
*/
asm volatile("mftb %0" : "=r"(tb) : : "memory");
return tb;
}
#endif
enum tb_cmpval {
TB_ABEFOREB = -1,
TB_AEQUALB = 0,
TB_AAFTERB = 1
};
static inline enum tb_cmpval tb_compare(unsigned long a,
unsigned long b)
{
if (a == b)
return TB_AEQUALB;
return ((long)(b - a)) > 0 ? TB_ABEFOREB : TB_AAFTERB;
}
/* Architected timebase */
extern unsigned long tb_hz;
static inline unsigned long secs_to_tb(unsigned long secs)
{
return secs * tb_hz;
}
static inline unsigned long tb_to_secs(unsigned long tb)
{
return tb / tb_hz;
}
static inline unsigned long tb_remaining_nsecs(unsigned long tb)
{
return tb % tb_hz;
}
static inline unsigned long msecs_to_tb(unsigned long msecs)
{
return msecs * (tb_hz / 1000);
}
static inline unsigned long tb_to_msecs(unsigned long tb)
{
return (tb * 1000) / tb_hz;
}
static inline unsigned long usecs_to_tb(unsigned long usecs)
{
return usecs * (tb_hz / 1000000);
}
static inline unsigned long tb_to_usecs(unsigned long tb)
{
return (tb * 1000000) / tb_hz;
}
extern unsigned long timespec_to_tb(const struct timespec *ts);
/* time_wait - Wait a certain number of TB ticks while polling FSP */
extern void time_wait(unsigned long duration);
extern void time_wait_nopoll(unsigned long duration);
/* time_wait_ms - Wait a certain number of milliseconds while polling FSP */
extern void time_wait_ms(unsigned long ms);
extern void time_wait_ms_nopoll(unsigned long ms);
/* time_wait_us - Wait a certain number of microseconds while polling FSP */
extern void time_wait_us(unsigned long us);
extern void time_wait_us_nopoll(unsigned long us);
/* nanosleep_nopoll - variant for use from hostservices */
extern int nanosleep_nopoll(const struct timespec *req, struct timespec *rem);
#endif /* __TIME_H */
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