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drivers/timer/gecko_burtc: allow queries prior to timer initialization

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Before BURTC is initialized, clock to its APB CSR file is stopped, so
any attempt to read BURTC regs results in BusFault. However,
many parts of Zephyr may call sys_clock getters even before sys_clock
driver itself is initialized. This change adds support for that:
sys_clock_elapsed() and sys_clock_cycle_get_32() simply return 0
if BURTC is not init yet.

Signed-off-by: Roman Dobrodii <rdobrodii@antmicro.com>
This commit is contained in:
Roman Dobrodii 2023-05-11 18:02:18 +02:00 • committed by Anas Nashif
commit 549358255f
1 changed files with 11 additions and 2 deletions
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13
drivers/timer/gecko_burtc_timer.c
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@ -69,6 +69,8 @@ static atomic_t g_last_count;
/* Spinlock to sync between Compare ISR and update of Compare register */
static struct k_spinlock g_lock;
/* Set to true when timer is initialized */
static atomic_t g_init = ATOMIC_INIT(0);
static void burtc_isr(const void *arg)
{
@ -161,8 +163,10 @@ uint32_t sys_clock_elapsed(void)
{
if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) {
return 0;
} else {
} else if (atomic_get(&g_init)) {
return (BURTC_CounterGet() - g_last_count) / g_cyc_per_tick;
} else {
return 0;
}
}
@ -172,7 +176,11 @@ uint32_t sys_clock_cycle_get_32(void)
* a value of some 32-bit hw_cycles counter which counts with
* z_clock_hw_cycles_per_sec frequency
*/
return BURTC_CounterGet();
if (atomic_get(&g_init)) {
return BURTC_CounterGet();
} else {
return 0;
}
}
static int burtc_init(void)
@ -214,6 +222,7 @@ static int burtc_init(void)
init.clkDiv = 1;
init.start = false;
BURTC_Init(&init);
atomic_set(&g_init, 1);
/* Enable compare match interrupt */
BURTC_IntClear(BURTC_IF_COMP);