s5j/timerisr: add missing initialization on RTC

The first stage bootloader is initializing RTCCON[7:4] to 0x4 before it
jumps to subsequent stages. This is no harm if we clear it while
initializing the RTC, but it is not cleared when CONFIG_RTC is not set
and causing OS timetick to be generated at 2048Hz. To avoid this issue,
we need to clear it always before enabling the timer isr.

Change-Id: Id27a079e35f5d0a93d6a6428117daa3d45b71a61
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>

diff --git a/os/arch/arm/src/s5j/s5j_timerisr.c b/os/arch/arm/src/s5j/s5j_timerisr.c
index 0240a33..ef53455 100644 (file)
--- a/os/arch/arm/src/s5j/s5j_timerisr.c
+++ b/os/arch/arm/src/s5j/s5j_timerisr.c
@@ -117,7 +117,8 @@ void up_timer_initialize(void)
        /* Configure the RTC timetick to generate periodic interrupts */
        modifyreg32(S5J_RTC_RTCCON, RTC_RTCCON_TICKEN0_ENABLE, 0);
        putreg32(SYSTICK_RELOAD, S5J_RTC_TICCNT0);
-       modifyreg32(S5J_RTC_RTCCON, 0, RTC_RTCCON_TICKEN0_ENABLE);
+       modifyreg32(S5J_RTC_RTCCON, RTC_RTCCON_TICCKSEL0_MASK,
+                                       RTC_RTCCON_TICKEN0_ENABLE | RTC_RTCCON_TICCKSEL0_32768HZ);
 
        /* Attach the timer interrupt vector */
        irq_attach(IRQ_TOP_RTC_TIC, up_timerisr, NULL);