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_aclint_timer.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/drivers/timer/riscv_aclint_timer.c b/drivers/timer/riscv_aclint_timer.c index e29d527c8d77..73fb87912851 100644 --- a/drivers/timer/riscv_aclint_timer.c +++ b/drivers/timer/riscv_aclint_timer.c @@ -6,6 +6,7 @@
#include <common.h> #include <clk.h> +#include <div64.h> #include <dm.h> #include <timer.h> #include <asm/io.h> @@ -44,6 +45,28 @@ u64 notrace timer_early_get_count(void) } #endif
+#if CONFIG_IS_ENABLED(RISCV_MMODE) && 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_MMODE_TIMER_FREQ; + ticks = readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE, + RISCV_MMODE_TIMEROFF)); + } + + /* Below is converted from time(us) = (tick / rate) * 10000000 */ + return lldiv(ticks * 1000, (rate / 1000)); +} +#endif + static const struct timer_ops riscv_aclint_timer_ops = { .get_count = riscv_aclint_timer_get_count, };