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/arch/arm/cpu/arm926ejs/omap/timer.c

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+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#define TIMER_CLOCK	(CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
+#define TIMER_LOAD_VAL	0xffffffff
+
+/* macro to read the 32 bit timer */
+#define READ_TIMER	readl(CONFIG_SYS_TIMERBASE+8) \
+			/ (TIMER_CLOCK / CONFIG_SYS_HZ)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp gd->arch.tbl
+#define lastdec gd->arch.lastinc
+
+int timer_init (void)
+{
+	int32_t val;
+
+	/* Start the decrementer ticking down from 0xffffffff */
+	*((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
+	val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT);
+	*((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val;
+
+	/* init the timestamp and lastdec value */
+	reset_timer_masked();
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer (ulong base)
+{
+	return get_timer_masked () - base;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay (unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	if(usec >= 1000){		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;	/* start to normalize for usec to ticks per sec */
+		tmo *= CONFIG_SYS_HZ;	/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;		/* finish normalize. */
+	}else{				/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	tmp = get_timer (0);		/* get current timestamp */
+	if( (tmo + tmp + 1) < tmp )	/* if setting this fordward will roll time stamp */
+		reset_timer_masked ();	/* reset "advancing" timestamp to 0, set lastdec value */
+	else
+		tmo += tmp;		/* else, set advancing stamp wake up time */
+
+	while (get_timer_masked () < tmo)/* loop till event */
+		/*NOP*/;
+}
+
+void reset_timer_masked (void)
+{
+	/* reset time */
+	lastdec = READ_TIMER;  /* capure current decrementer value time */
+	timestamp = 0;	       /* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked (void)
+{
+	ulong now = READ_TIMER;		/* current tick value */
+
+	if (lastdec >= now) {		/* normal mode (non roll) */
+		/* normal mode */
+		timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
+	} else {			/* we have overflow of the count down timer */
+		/* nts = ts + ld + (TLV - now)
+		 * ts=old stamp, ld=time that passed before passing through -1
+		 * (TLV-now) amount of time after passing though -1
+		 * nts = new "advancing time stamp"...it could also roll and cause problems.
+		 */
+		timestamp += lastdec + (TIMER_LOAD_VAL / (TIMER_CLOCK /
+					CONFIG_SYS_HZ)) - now;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+/* waits specified delay value and resets timestamp */
+void udelay_masked (unsigned long usec)
+{
+	ulong tmo;
+	ulong endtime;
+	signed long diff;
+
+	if (usec >= 1000) {		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;	/* start to normalize for usec to ticks per sec */
+		tmo *= CONFIG_SYS_HZ;		/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;		/* finish normalize. */
+	} else {			/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	endtime = get_timer_masked () + tmo;
+
+	do {
+		ulong now = get_timer_masked ();
+		diff = endtime - now;
+	} while (diff >= 0);
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk (void)
+{
+	return CONFIG_SYS_HZ;
+}