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kernel: retrieve system timer clock frequency at runtime or static

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update kernel timeout logic based on retrieve system timer clock
frequency at runtime or static way based on Kconfig
TIMER_READS_ITS_FREQUENCY_AT_RUNTIME

Signed-off-by: Najumon B.A <najumon.ba@intel.com>
This commit is contained in:
Najumon B.A 2024-03-02 12:00:41 +05:30 • committed by Johan Hedberg
commit 7c03e5de7f
3 changed files with 6 additions and 5 deletions
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8
include/zephyr/sys_clock.h
View file

@ -146,9 +146,9 @@ typedef struct {
/** @endcond */
#if defined(CONFIG_SYS_CLOCK_EXISTS) && \
(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC == 0)
#error "SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!"
#if defined(CONFIG_SYS_CLOCK_EXISTS) && !defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
BUILD_ASSERT(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC != 0,
"SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!");
#endif
@ -164,7 +164,7 @@ typedef struct {
* @{
*/
#ifdef CONFIG_SYS_CLOCK_EXISTS
#if defined(CONFIG_SYS_CLOCK_EXISTS) && !defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) || \
(MSEC_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC) || \

1
kernel/Kconfig
View file

@ -799,6 +799,7 @@ config SYS_CLOCK_TICKS_PER_SEC
config SYS_CLOCK_HW_CYCLES_PER_SEC
int "System clock's h/w timer frequency"
depends on !TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
help
This option specifies the frequency of the hardware timer used for the
system clock (in Hz). This option is set by the SOC's or board's Kconfig file

2
kernel/timeout.c
View file

@ -25,7 +25,7 @@ static struct k_spinlock timeout_lock;
static int announce_remaining;
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
int z_clock_hw_cycles_per_sec = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
int z_clock_hw_cycles_per_sec;
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_sys_clock_hw_cycles_per_sec_runtime_get(void)