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) * 10000000 To : time(us) = (tick * 1000) / (rate / 1000)
Signed-off-by: Chanho Park chanho61.park@samsung.com --- drivers/timer/riscv_timer.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/timer/riscv_timer.c b/drivers/timer/riscv_timer.c index 28a6a6870b81..169c03dcb5c1 100644 --- a/drivers/timer/riscv_timer.c +++ b/drivers/timer/riscv_timer.c @@ -11,6 +11,7 @@ */
#include <common.h> +#include <div64.h> #include <dm.h> #include <errno.h> #include <fdt_support.h> @@ -51,6 +52,27 @@ u64 notrace timer_early_get_count(void) } #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) { struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);