diff options
| author | Chanho Park | 2023-09-06 14:18:13 +0900 |
|---|---|---|
| committer | Leo Yu-Chi Liang | 2023-10-04 17:55:20 +0800 |
| commit | 74fbd74ed2069985c9d7dd15ffe94f8a95f1022a (patch) | |
| tree | 2ecd7283cf583e45157c3ca9632ef913abb708e6 /drivers | |
| parent | 9bcf9e49a24e1cd96565b8ccd40b23ab956c3376 (diff) | |
riscv: timer: add timer_get_boot_us for BOOTSTAGE
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/timer/riscv_timer.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/timer/riscv_timer.c b/drivers/timer/riscv_timer.c index 28a6a6870b8..169c03dcb5c 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); |