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arch/arm64/imx9: Fix cntfrq_el0 to correct value

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Read base frequency from system counter0 and write it
to arm core register. This corrects timers to work properly
Then enable counting.

Signed-off-by: Jouni Ukkonen <jouni.ukkonen@unikie.com>
This commit is contained in:
Jouni Ukkonen 2024-08-20 10:44:54 +03:00 committed by Alan C. Assis
parent 1d04884812
commit 085830612c
1 changed files with 8 additions and 1 deletions
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9
arch/arm64/src/imx9/imx9_boot.c
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@ -103,7 +103,14 @@ void arm64_el_init(void)
#if (CONFIG_ARCH_ARM64_EXCEPTION_LEVEL == 3)
/* At EL3, cntfrq_el0 is uninitialized. It must be set. */
write_sysreg(CONFIG_BOOTLOADER_SYS_CLOCK, cntfrq_el0);
uint32_t freq;
/* Read Frequency ID0 (24MHz) and write it to arm core */
freq = getreg32(IMX9_SYS_CTR_CONTROL_BASE + SYS_CTR_CNTFID0);
write_sysreg(freq, cntfrq_el0);
modifyreg32(IMX9_SYS_CTR_CONTROL_BASE + SYS_CTR_CNTCR, SC_CNTCR_FREQ1,
SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG);
#endif
}