avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/lib/time.c

@@ -0,0 +1,162 @@
+/*
+ * (C) Copyright 2000-2009
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <watchdog.h>
+#include <div64.h>
+#include <asm/io.h>
+
+#ifndef CONFIG_WD_PERIOD
+# define CONFIG_WD_PERIOD	(10 * 1000 * 1000)	/* 10 seconds default */
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SYS_TIMER_RATE
+/* Returns tick rate in ticks per second */
+ulong notrace get_tbclk(void)
+{
+	return CONFIG_SYS_TIMER_RATE;
+}
+#endif
+
+#ifdef CONFIG_SYS_TIMER_COUNTER
+unsigned long notrace timer_read_counter(void)
+{
+#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
+	return ~readl(CONFIG_SYS_TIMER_COUNTER);
+#else
+	return readl(CONFIG_SYS_TIMER_COUNTER);
+#endif
+}
+#else
+extern unsigned long __weak timer_read_counter(void);
+#endif
+
+#ifdef CONFIG_TIMER
+ulong notrace get_tbclk(void)
+{
+	if (!gd->timer) {
+#ifdef CONFIG_TIMER_EARLY
+		return timer_early_get_rate();
+#else
+		int ret;
+
+		ret = dm_timer_init();
+		if (ret)
+			return ret;
+#endif
+	}
+
+	return timer_get_rate(gd->timer);
+}
+
+uint64_t notrace get_ticks(void)
+{
+	u64 count;
+	int ret;
+
+	if (!gd->timer) {
+#ifdef CONFIG_TIMER_EARLY
+		return timer_early_get_count();
+#else
+		int ret;
+
+		ret = dm_timer_init();
+		if (ret)
+			return ret;
+#endif
+	}
+
+	ret = timer_get_count(gd->timer, &count);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+#else /* !CONFIG_TIMER */
+
+uint64_t __weak notrace get_ticks(void)
+{
+	unsigned long now = timer_read_counter();
+
+	/* increment tbu if tbl has rolled over */
+	if (now < gd->timebase_l)
+		gd->timebase_h++;
+	gd->timebase_l = now;
+	return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
+}
+
+#endif /* CONFIG_TIMER */
+
+/* Returns time in milliseconds */
+static uint64_t notrace tick_to_time(uint64_t tick)
+{
+	ulong div = get_tbclk();
+
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, div);
+	return tick;
+}
+
+int __weak timer_init(void)
+{
+	return 0;
+}
+
+/* Returns time in milliseconds */
+ulong __weak get_timer(ulong base)
+{
+	return tick_to_time(get_ticks()) - base;
+}
+
+unsigned long __weak notrace timer_get_us(void)
+{
+	return tick_to_time(get_ticks() * 1000);
+}
+
+static uint64_t usec_to_tick(unsigned long usec)
+{
+	uint64_t tick = usec;
+	tick *= get_tbclk();
+	do_div(tick, 1000000);
+	return tick;
+}
+
+void __weak __udelay(unsigned long usec)
+{
+	uint64_t tmp;
+
+	tmp = get_ticks() + usec_to_tick(usec);	/* get current timestamp */
+
+	while (get_ticks() < tmp+1)	/* loop till event */
+		 /*NOP*/;
+}
+
+/* ------------------------------------------------------------------------- */
+
+void udelay(unsigned long usec)
+{
+	ulong kv;
+
+	do {
+		WATCHDOG_RESET();
+		kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
+		__udelay (kv);
+		usec -= kv;
+	} while(usec);
+}
+
+void mdelay(unsigned long msec)
+{
+	while (msec--)
+		udelay(1000);
+}