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

source/bootloader/u-boot-2020.01/arch/arm/cpu/armv7/arch_timer.c

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2012-2014
+ *     Texas Instruments Incorporated, <www.ti.com>
+ */
+
+#include <common.h>
+#include <time.h>
+#include <asm/io.h>
+#include <div64.h>
+#include <bootstage.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SYS_HZ_CLOCK
+static inline u32 read_cntfrq(void)
+{
+	u32 frq;
+
+	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (frq));
+	return frq;
+}
+#endif
+
+int timer_init(void)
+{
+	gd->arch.tbl = 0;
+	gd->arch.tbu = 0;
+
+#ifdef CONFIG_SYS_HZ_CLOCK
+	gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK;
+#else
+	gd->arch.timer_rate_hz = read_cntfrq();
+#endif
+	return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+	ulong nowl, nowu;
+
+	asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
+
+	gd->arch.tbl = nowl;
+	gd->arch.tbu = nowu;
+
+	return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
+}
+
+
+ulong timer_get_boot_us(void)
+{
+	if (!gd->arch.timer_rate_hz)
+		timer_init();
+
+	return lldiv(get_ticks(), gd->arch.timer_rate_hz / 1000000);
+}
+
+ulong get_tbclk(void)
+{
+	return gd->arch.timer_rate_hz;
+}