[PATCH 15/49] imx: imx9: Add function to initialize timer

[Peng Fan (OSS)]

From: Jian Li <jian.li at nxp.com>

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 at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/include/asm/arch-imx9/imx-regs.h |  1 +
 arch/arm/mach-imx/imx9/soc.c              | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm/include/asm/arch-imx9/imx-regs.h b/arch/arm/include/asm/arch-imx9/imx-regs.h
index 50ec902987d..32c76ce9c3b 100644
--- a/arch/arm/include/asm/arch-imx9/imx-regs.h
+++ b/arch/arm/include/asm/arch-imx9/imx-regs.h
@@ -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
 
diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c
index d4a97729c67..4b8f1ca30d5 100644
--- a/arch/arm/mach-imx/imx9/soc.c
+++ b/arch/arm/mach-imx/imx9/soc.c
@@ -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;
+}
-- 
2.36.0