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/m68k/cpu/mcf547x_8x/slicetimer.c

@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2007, 2012 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#include <asm/timer.h>
+#include <asm/immap.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong timestamp;
+
+#if defined(CONFIG_SLTTMR)
+#ifndef CONFIG_SYS_UDELAY_BASE
+#	error	"uDelay base not defined!"
+#endif
+
+#if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
+#	error	"TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
+#endif
+extern void dtimer_intr_setup(void);
+
+void __udelay(unsigned long usec)
+{
+	slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE);
+	u32 now, freq;
+
+	/* 1 us period */
+	freq = CONFIG_SYS_TIMER_PRESCALER;
+
+	/* Disable */
+	out_be32(&timerp->cr, 0);
+	out_be32(&timerp->tcnt, usec * freq);
+	out_be32(&timerp->cr, SLT_CR_TEN);
+
+	now = in_be32(&timerp->cnt);
+	while (now != 0)
+		now = in_be32(&timerp->cnt);
+
+	setbits_be32(&timerp->sr, SLT_SR_ST);
+	out_be32(&timerp->cr, 0);
+}
+
+void dtimer_interrupt(void *not_used)
+{
+	slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
+
+	/* check for timer interrupt asserted */
+	if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
+		setbits_be32(&timerp->sr, SLT_SR_ST);
+		timestamp++;
+		return;
+	}
+}
+
+int timer_init(void)
+{
+	slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
+
+	timestamp = 0;
+
+	/* disable timer */
+	out_be32(&timerp->cr, 0);
+	out_be32(&timerp->tcnt, 0);
+	/* clear status */
+	out_be32(&timerp->sr, SLT_SR_BE | SLT_SR_ST);
+
+	/* initialize and enable timer interrupt */
+	irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
+
+	/* Interrupt every ms */
+	out_be32(&timerp->tcnt, 1000 * CONFIG_SYS_TIMER_PRESCALER);
+
+	dtimer_intr_setup();
+
+	/* set a period of 1us, set timer mode to restart and
+	   enable timer and interrupt */
+	out_be32(&timerp->cr, SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN);
+	return 0;
+}
+
+ulong get_timer(ulong base)
+{
+	return (timestamp - base);
+}
+
+#endif				/* CONFIG_SLTTMR */