GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/mach-socfpga/timer_s10.c

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017-2018 Intel Corporation <www.intel.com>
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/timer.h>
+
+/*
+ * Timer initialization
+ */
+int timer_init(void)
+{
+	int enable = 0x3;	/* timer enable + output signal masked */
+	int loadval = ~0;
+
+	/* enable system counter */
+	writel(enable, SOCFPGA_GTIMER_SEC_ADDRESS);
+	/* enable processor pysical counter */
+	asm volatile("msr cntp_ctl_el0, %0" : : "r" (enable));
+	asm volatile("msr cntp_tval_el0, %0" : : "r" (loadval));
+
+	return 0;
+}