diff options
| author | Michael Walle <michael@walle.cc> | 2022-08-17 22:37:48 +0300 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2022-08-23 13:38:30 +0300 |
| commit | 616278bd2c563a6d12a2347ce5cfc3512f77ee42 (patch) | |
| tree | 355500f0b9baa66528aa555110a63b67b56ff6b1 /lib/time.c | |
| parent | 7875f8019c15ee557d4d7807cd1164876b47e8f3 (diff) | |
| download | u-boot-616278bd2c563a6d12a2347ce5cfc3512f77ee42.tar.xz | |
time: move the CONFIG_SYS_TIMER_RATE handling to the compiler
CONFIG_SYS_TIMER_RATE might be a dynamic value, i.e. a function call
instead of a static value, thus it has to be evaluated at runtime. If it
is a static value, the compiler should be able to optimize the unused
branches out.
This will be needed for kirkwoods dynamic CONFIG_SYS_TCLK setting.
Cc: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'lib/time.c')
| -rw-r--r-- | lib/time.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/time.c b/lib/time.c index 96074b84af..bbf191f673 100644 --- a/lib/time.c +++ b/lib/time.c @@ -47,12 +47,15 @@ ulong timer_get_boot_us(void) { ulong count = timer_read_counter(); -#if CONFIG_SYS_TIMER_RATE == 1000000 - return count; -#elif CONFIG_SYS_TIMER_RATE > 1000000 - return lldiv(count, CONFIG_SYS_TIMER_RATE / 1000000); -#elif defined(CONFIG_SYS_TIMER_RATE) - return (unsigned long long)count * 1000000 / CONFIG_SYS_TIMER_RATE; +#ifdef CONFIG_SYS_TIMER_RATE + const ulong timer_rate = CONFIG_SYS_TIMER_RATE; + + if (timer_rate == 1000000) + return count; + else if (timer_rate > 1000000) + return lldiv(count, timer_rate / 1000000); + else + return (unsigned long long)count * 1000000 / timer_rate; #else /* Assume the counter is in microseconds */ return count; |