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smartbond_timer: Fix convertion of watchdog value to LP clock ticks

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Fix convertion of watchdog value to LP clock ticks

Signed-off-by: Ioannis Damigos <ioannis.damigos.uj@renesas.com>
This commit is contained in:
Ioannis Damigos 2024-05-24 14:53:15 +03:00 • committed by Alberto Escolar
commit 4b40c11c42
1 changed files with 31 additions and 3 deletions
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34
drivers/timer/smartbond_timer.c
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@ -5,6 +5,8 @@
*/
#include <zephyr/device.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/smartbond_clock_control.h>
#include <zephyr/drivers/timer/system_timer.h>
#include <zephyr/sys_clock.h>
#include <zephyr/spinlock.h>
@ -17,6 +19,10 @@
#define TICK_TO_CYC(tick) k_ticks_to_cyc_ceil32(tick)
#define CYC_TO_TICK(cyc) k_cyc_to_ticks_ceil32(cyc)
#define MAX_TICKS (((COUNTER_SPAN / 2) - CYC_PER_TICK) / (CYC_PER_TICK))
#define SMARTBOND_CLOCK_CONTROLLER DEVICE_DT_GET(DT_NODELABEL(osc))
/* Margin values are based on DA1469x characterization data */
#define RC32K_FREQ_POSITIVE_MARGIN_DUE_TO_VOLTAGE (675)
#define RC32K_FREQ_MARGIN_DUE_TO_TEMPERATURE (450)
static uint32_t last_timer_val_reg;
static uint32_t timer_val_31_24;
@ -25,6 +31,19 @@ static uint32_t last_isr_val;
static uint32_t last_isr_val_rounded;
static uint32_t announced_ticks;
static uint32_t get_rc32k_max_frequency(void)
{
/* According to DA1469x datasheet */
uint32_t r32k_frequency = 37000;
clock_control_get_rate(SMARTBOND_CLOCK_CONTROLLER,
(clock_control_subsys_t)SMARTBOND_CLK_RC32K, &r32k_frequency);
r32k_frequency += RC32K_FREQ_POSITIVE_MARGIN_DUE_TO_VOLTAGE +
RC32K_FREQ_MARGIN_DUE_TO_TEMPERATURE;
return r32k_frequency;
}
static void set_reload(uint32_t val)
{
TIMER2->TIMER2_RELOAD_REG = val & TIMER2_TIMER2_RELOAD_REG_TIM_RELOAD_Msk;
@ -88,11 +107,20 @@ void sys_clock_set_timeout(int32_t ticks, bool idle)
uint32_t watchdog_expire_ticks;
if (CRG_TOP->CLK_RCX_REG & CRG_TOP_CLK_RCX_REG_RCX_ENABLE_Msk) {
watchdog_expire_ticks = SYS_WDOG->WATCHDOG_REG * 21 *
CONFIG_SYS_CLOCK_TICKS_PER_SEC / 1000;
/*
* When LP clock is RCX, the watchdog is clocked by RCX clock
* divided by 320.
*/
watchdog_expire_ticks = SYS_WDOG->WATCHDOG_REG * 320;
} else {
/*
* When LP clock is not RCX, the watchdog is clocked by RC32K
* divided by 320. In this case watchdog value to LP clock
* ticks must be calculated according to XTAL32K frequency and
* RC32K maximum frequency.
*/
watchdog_expire_ticks = SYS_WDOG->WATCHDOG_REG *
CONFIG_SYS_CLOCK_TICKS_PER_SEC / 100;
CONFIG_SYS_CLOCK_TICKS_PER_SEC / (get_rc32k_max_frequency() / 320);
}
if (watchdog_expire_ticks - 2 < ticks) {
ticks = watchdog_expire_ticks - 2;