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/mach-davinci/timer.c

@@ -0,0 +1,128 @@
+/*
+ * (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>
+ *
+ * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/timer_defs.h>
+#include <div64.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct davinci_timer * const timer =
+	(struct davinci_timer *)CONFIG_SYS_TIMERBASE;
+
+#define TIMER_LOAD_VAL	0xffffffff
+
+#define TIM_CLK_DIV	16
+
+int timer_init(void)
+{
+	/* We are using timer34 in unchained 32-bit mode, full speed */
+	writel(0x0, &timer->tcr);
+	writel(0x0, &timer->tgcr);
+	writel(0x06 | ((TIM_CLK_DIV - 1) << 8), &timer->tgcr);
+	writel(0x0, &timer->tim34);
+	writel(TIMER_LOAD_VAL, &timer->prd34);
+	writel(2 << 22, &timer->tcr);
+	gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / TIM_CLK_DIV;
+	gd->arch.timer_reset_value = 0;
+
+	return(0);
+}
+
+/*
+ * Get the current 64 bit timer tick count
+ */
+unsigned long long get_ticks(void)
+{
+	unsigned long now = readl(&timer->tim34);
+
+	/* increment tbu if tbl has rolled over */
+	if (now < gd->arch.tbl)
+		gd->arch.tbu++;
+	gd->arch.tbl = now;
+
+	return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
+}
+
+ulong get_timer(ulong base)
+{
+	unsigned long long timer_diff;
+
+	timer_diff = get_ticks() - gd->arch.timer_reset_value;
+
+	return lldiv(timer_diff,
+		     (gd->arch.timer_rate_hz / CONFIG_SYS_HZ)) - base;
+}
+
+void __udelay(unsigned long usec)
+{
+	unsigned long long endtime;
+
+	endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
+			1000000UL);
+	endtime += get_ticks();
+
+	while (get_ticks() < endtime)
+		;
+}
+
+/*
+ * 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 gd->arch.timer_rate_hz;
+}
+
+#ifdef CONFIG_HW_WATCHDOG
+static struct davinci_timer * const wdttimer =
+	(struct davinci_timer *)CONFIG_SYS_WDTTIMERBASE;
+
+/*
+ * See prufw2.pdf for using Timer as a WDT
+ */
+void davinci_hw_watchdog_enable(void)
+{
+	writel(0x0, &wdttimer->tcr);
+	writel(0x0, &wdttimer->tgcr);
+	/* TIMMODE = 2h */
+	writel(0x08 | 0x03 | ((TIM_CLK_DIV - 1) << 8), &wdttimer->tgcr);
+	writel(CONFIG_SYS_WDT_PERIOD_LOW, &wdttimer->prd12);
+	writel(CONFIG_SYS_WDT_PERIOD_HIGH, &wdttimer->prd34);
+	writel(2 << 22, &wdttimer->tcr);
+	writel(0x0, &wdttimer->tim12);
+	writel(0x0, &wdttimer->tim34);
+	/* set WDEN bit, WDKEY 0xa5c6 */
+	writel(0xa5c64000, &wdttimer->wdtcr);
+	/* clear counter register */
+	writel(0xda7e4000, &wdttimer->wdtcr);
+}
+
+void davinci_hw_watchdog_reset(void)
+{
+	writel(0xa5c64000, &wdttimer->wdtcr);
+	writel(0xda7e4000, &wdttimer->wdtcr);
+}
+#endif