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imx: imx9: Add function to initialize timer

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Add timer_init to update ARM arch timer with correct frequency
from system counter and enable system counter.

Signed-off-by: Jian Li <jian.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Jian Li 2022-07-26 16:40:46 +08:00 committed by Stefano Babic
parent 65c56bcaec
commit 53cf550d23
2 changed files with 20 additions and 0 deletions
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1
arch/arm/include/asm/arch-imx9/imx-regs.h
View File

@ -11,6 +11,7 @@
#define IOMUXC_BASE_ADDR 0x443C0000UL
#define CCM_BASE_ADDR 0x44450000UL
#define CCM_CCGR_BASE_ADDR 0x44458000UL
#define SYSCNT_CTRL_BASE_ADDR 0x44290000
#define ANATOP_BASE_ADDR 0x44480000UL

19
arch/arm/mach-imx/imx9/soc.c
View File

@ -128,3 +128,22 @@ int arch_cpu_init(void)
return 0;
}
int timer_init(void)
{
#ifdef CONFIG_SPL_BUILD
struct sctr_regs *sctr = (struct sctr_regs *)SYSCNT_CTRL_BASE_ADDR;
unsigned long freq = readl(&sctr->cntfid0);
/* Update with accurate clock frequency */
asm volatile("msr cntfrq_el0, %0" : : "r" (freq) : "memory");
clrsetbits_le32(&sctr->cntcr, SC_CNTCR_FREQ0 | SC_CNTCR_FREQ1,
SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG);
#endif
gd->arch.tbl = 0;
gd->arch.tbu = 0;
return 0;
}