int main(void)
{
/* This is a fairly solid assumption that the math we're doing
* is based on tb_hz of exactly 512mhz.
* If we do start doing the math on different tb_hz, you probably
* want to go and audit every bit of code that touches tb to
* count/delay things.
*/
assert(tb_hz == 512000000);
assert(secs_to_tb(1) == tb_hz);
assert(secs_to_tb(2) == 1024000000);
assert(secs_to_tb(10) == 5120000000);
assert(tb_to_secs(512000000) == 1);
assert(tb_to_secs(5120000000) == 10);
assert(tb_to_secs(1024000000) == 2);
assert(msecs_to_tb(1) == 512000);
assert(msecs_to_tb(100) == 51200000);
assert(msecs_to_tb(5) == 2560000);
assert(tb_to_msecs(512000) == 1);
assert(usecs_to_tb(5) == 2560);
assert(tb_to_usecs(2560) == 5);
assert(usecs_to_tb(5)*1000 == msecs_to_tb(5));
assert(tb_to_usecs(512000) == 1000);
assert(tb_compare(msecs_to_tb(5), usecs_to_tb(5)) == TB_AAFTERB);
assert(tb_compare(msecs_to_tb(5), usecs_to_tb(50000)) == TB_ABEFOREB);
assert(tb_compare(msecs_to_tb(5), usecs_to_tb(5)*1000) == TB_AEQUALB);
return 0;
}
void p8_sbe_init_timer(void)
{
struct dt_node *np;
int64_t rc;
uint32_t tick_us;
np = dt_find_compatible_node(dt_root, NULL, "ibm,power8-sbe-timer");
if (!np)
return;
sbe_timer_chip = dt_get_chip_id(np);
tick_us = dt_prop_get_u32(np, "tick-time-us");
sbe_timer_inc = usecs_to_tb(tick_us);
sbe_timer_target = ~0ull;
rc = xscom_read(sbe_timer_chip, 0xE0006, &sbe_last_gen);
if (rc) {
prerror("SLW: Error %lld reading tmr gen count\n", rc);
return;
}
sbe_last_gen_stamp = mftb();
prlog(PR_INFO, "SLW: Timer facility on chip %d, resolution %dus\n",
sbe_timer_chip, tick_us);
sbe_has_timer = true;
}
void cpu_wait_job(struct cpu_job *job, bool free_it)
{
unsigned long ticks = usecs_to_tb(5);
if (!job)
return;
while(!job->complete) {
time_wait(ticks);
lwsync();
}
lwsync();
smt_medium();
if (free_it)
free(job);
}
