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/drivers/rtc/mpc5xxx.c

@@ -0,0 +1,128 @@
+/*
+ * (C) Copyright 2004
+ * Reinhard Meyer, EMK Elektronik GmbH
+ * r.meyer@emk-elektronik.de
+ * www.emk-elektronik.de
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*****************************************************************************
+ * Date & Time support for internal RTC of MPC52xx
+ *****************************************************************************/
+/*#define	DEBUG*/
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+/*****************************************************************************
+ * this structure should be defined in mpc5200.h ...
+ *****************************************************************************/
+typedef struct rtc5200 {
+	volatile ulong	tsr;	/* MBAR+0x800: time set register */
+	volatile ulong	dsr;	/* MBAR+0x804: data set register */
+	volatile ulong	nysr;	/* MBAR+0x808: new year and stopwatch register */
+	volatile ulong	aier;	/* MBAR+0x80C: alarm and interrupt enable register */
+	volatile ulong	ctr;	/* MBAR+0x810: current time register */
+	volatile ulong	cdr;	/* MBAR+0x814: current data register */
+	volatile ulong	asir;	/* MBAR+0x818: alarm and stopwatch interrupt register */
+	volatile ulong	piber;	/* MBAR+0x81C: periodic interrupt and bus error register */
+	volatile ulong	trdr;	/* MBAR+0x820: test register/divides register */
+} RTC5200;
+
+#define	RTC_SET		0x02000000
+#define	RTC_PAUSE	0x01000000
+
+/*****************************************************************************
+ * get time
+ *****************************************************************************/
+int rtc_get (struct rtc_time *tmp)
+{
+	RTC5200	*rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
+	ulong time, date, time2;
+
+	/* read twice to avoid getting a funny time when the second is just changing */
+	do {
+		time = rtc->ctr;
+		date = rtc->cdr;
+		time2 = rtc->ctr;
+	} while (time != time2);
+
+	tmp->tm_year	= date & 0xfff;
+	tmp->tm_mon		= (date >> 24) & 0xf;
+	tmp->tm_mday	= (date >> 16) & 0x1f;
+	tmp->tm_wday	= (date >> 21) & 7;
+	/* sunday is 7 in 5200 but 0 in rtc_time */
+	if (tmp->tm_wday == 7)
+		tmp->tm_wday = 0;
+	tmp->tm_hour	= (time >> 16) & 0x1f;
+	tmp->tm_min		= (time >> 8) & 0x3f;
+	tmp->tm_sec		= time & 0x3f;
+
+	debug ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	return 0;
+}
+
+/*****************************************************************************
+ * set time
+ *****************************************************************************/
+int rtc_set (struct rtc_time *tmp)
+{
+	RTC5200	*rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
+	ulong time, date, year;
+
+	debug ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	time = (tmp->tm_hour << 16) | (tmp->tm_min << 8) | tmp->tm_sec;
+	date = (tmp->tm_mon << 16) | tmp->tm_mday;
+	if (tmp->tm_wday == 0)
+		date |= (7 << 8);
+	else
+		date |= (tmp->tm_wday << 8);
+	year = tmp->tm_year;
+
+	/* mask unwanted bits that might show up when rtc_time is corrupt */
+	time &= 0x001f3f3f;
+	date &= 0x001f071f;
+	year &= 0x00000fff;
+
+	/* pause and set the RTC */
+	rtc->nysr = year;
+	rtc->dsr = date | RTC_PAUSE;
+	udelay (1000);
+	rtc->dsr = date | RTC_PAUSE | RTC_SET;
+	udelay (1000);
+	rtc->dsr = date | RTC_PAUSE;
+	udelay (1000);
+	rtc->dsr = date;
+	udelay (1000);
+
+	rtc->tsr = time | RTC_PAUSE;
+	udelay (1000);
+	rtc->tsr = time | RTC_PAUSE | RTC_SET;
+	udelay (1000);
+	rtc->tsr = time | RTC_PAUSE;
+	udelay (1000);
+	rtc->tsr = time;
+	udelay (1000);
+
+	return 0;
+}
+
+/*****************************************************************************
+ * reset rtc circuit
+ *****************************************************************************/
+void rtc_reset (void)
+{
+	return;	/* nothing to do */
+}
+
+#endif