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riscv: timer: add timer_get_boot_us for BOOTSTAGE

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timer_get_boot_us function is required to record the boot stages as
us-based timestamp.
To get a micro-second time from a timer tick, this converts the
formula like below to avoid zero result of (tick / rate) part.

From: time(us) = (tick / rate) * 1000000
To  : time(us) = (tick * 1000) / (rate / 1000)

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Chanho Park 2023-09-06 14:18:13 +09:00 committed by Leo Yu-Chi Liang
parent 9bcf9e49a2
commit 74fbd74ed2
1 changed files with 22 additions and 0 deletions
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22
drivers/timer/riscv_timer.c
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@ -11,6 +11,7 @@
*/ */
#include <common.h> #include <common.h>
#include <div64.h>
#include <dm.h> #include <dm.h>
#include <errno.h> #include <errno.h>
#include <fdt_support.h> #include <fdt_support.h>
@ -51,6 +52,27 @@ u64 notrace timer_early_get_count(void)
} }
#endif #endif
#if CONFIG_IS_ENABLED(RISCV_SMODE) && CONFIG_IS_ENABLED(BOOTSTAGE)
ulong timer_get_boot_us(void)
{
int ret;
u64 ticks = 0;
u32 rate;
ret = dm_timer_init();
if (!ret) {
rate = timer_get_rate(gd->timer);
timer_get_count(gd->timer, &ticks);
} else {
rate = RISCV_SMODE_TIMER_FREQ;
ticks = riscv_timer_get_count(NULL);
}
/* Below is converted from time(us) = (tick / rate) * 10000000 */
return lldiv(ticks * 1000, (rate / 1000));
}
#endif
static int riscv_timer_probe(struct udevice *dev) static int riscv_timer_probe(struct udevice *dev)
{ {
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);