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drivers: timer: Add support for Apollo3 SoCs system timer (STIMER)

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This commit adds support for the system timer peripheral which
can be found in Apollo3 SoCs

Signed-off-by: Hao Luo <hluo@ambiq.com>
This commit is contained in:
Hao Luo 2023-12-19 18:30:00 +08:00 committed by Carles Cufí
parent 3c1fd19d96
commit 638f1d58df
2 changed files with 14 additions and 14 deletions
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2
drivers/timer/Kconfig.ambiq
View file

@ -10,4 +10,4 @@ config AMBIQ_STIMER_TIMER
select TICKLESS_CAPABLE
select AMBIQ_HAL_USE_STIMER
help
Ambiq Apollo4 stimer driver
Ambiq Apollo stimer driver

26
drivers/timer/ambiq_stimer.c
View file

@ -24,11 +24,10 @@
#define COUNTER_MAX UINT32_MAX
#define CYC_PER_TICK (sys_clock_hw_cycles_per_sec() \
/ CONFIG_SYS_CLOCK_TICKS_PER_SEC)
#define MAX_TICKS ((k_ticks_t)(COUNTER_MAX / CYC_PER_TICK) - 1)
#define MAX_CYCLES (MAX_TICKS * CYC_PER_TICK)
#define MIN_DELAY 1
#define CYC_PER_TICK (sys_clock_hw_cycles_per_sec() / CONFIG_SYS_CLOCK_TICKS_PER_SEC)
#define MAX_TICKS ((k_ticks_t)(COUNTER_MAX / CYC_PER_TICK) - 1)
#define MAX_CYCLES (MAX_TICKS * CYC_PER_TICK)
#define MIN_DELAY 1
#define TIMER_IRQ (DT_INST_IRQN(0))
@ -102,8 +101,7 @@ uint32_t sys_clock_elapsed(void)
}
k_spinlock_key_t key = k_spin_lock(&g_lock);
uint32_t ret = (am_hal_stimer_counter_get()
- g_last_count) / CYC_PER_TICK;
uint32_t ret = (am_hal_stimer_counter_get() - g_last_count) / CYC_PER_TICK;
k_spin_unlock(&g_lock, key);
return ret;
@ -121,10 +119,13 @@ static int stimer_init(void)
oldCfg = am_hal_stimer_config(AM_HAL_STIMER_CFG_FREEZE);
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | STIMER_STCFG_CLKSEL_Msk))
| AM_HAL_STIMER_XTAL_32KHZ
| AM_HAL_STIMER_CFG_COMPARE_A_ENABLE);
#if defined(CONFIG_SOC_SERIES_APOLLO3X)
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | CTIMER_STCFG_CLKSEL_Msk)) |
AM_HAL_STIMER_XTAL_32KHZ | AM_HAL_STIMER_CFG_COMPARE_A_ENABLE);
#else
am_hal_stimer_config((oldCfg & ~(AM_HAL_STIMER_CFG_FREEZE | STIMER_STCFG_CLKSEL_Msk)) |
AM_HAL_STIMER_XTAL_32KHZ | AM_HAL_STIMER_CFG_COMPARE_A_ENABLE);
#endif
g_last_count = am_hal_stimer_counter_get();
k_spin_unlock(&g_lock, key);
@ -141,5 +142,4 @@ static int stimer_init(void)
return 0;
}
SYS_INIT(stimer_init, PRE_KERNEL_2,
CONFIG_SYSTEM_CLOCK_INIT_PRIORITY);
SYS_INIT(stimer_init, PRE_KERNEL_2, CONFIG_SYSTEM_CLOCK_INIT_PRIORITY);