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/s3c24x0_rtc.c

@@ -0,0 +1,154 @@
+/*
+ * (C) Copyright 2003
+ * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * Date & Time support for the built-in Samsung S3C24X0 RTC
+ */
+
+#include <common.h>
+#include <command.h>
+
+#if (defined(CONFIG_CMD_DATE))
+
+#include <asm/arch/s3c24x0_cpu.h>
+
+#include <rtc.h>
+#include <asm/io.h>
+#include <linux/compiler.h>
+
+typedef enum {
+	RTC_ENABLE,
+	RTC_DISABLE
+} RTC_ACCESS;
+
+
+static inline void SetRTC_Access(RTC_ACCESS a)
+{
+	struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
+
+	switch (a) {
+	case RTC_ENABLE:
+		writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon);
+		break;
+
+	case RTC_DISABLE:
+		writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon);
+		break;
+	}
+}
+
+/* ------------------------------------------------------------------------- */
+
+int rtc_get(struct rtc_time *tmp)
+{
+	struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
+	uchar sec, min, hour, mday, wday, mon, year;
+	__maybe_unused uchar a_sec, a_min, a_hour, a_date,
+			     a_mon, a_year, a_armed;
+
+	/* enable access to RTC registers */
+	SetRTC_Access(RTC_ENABLE);
+
+	/* read RTC registers */
+	do {
+		sec  = readb(&rtc->bcdsec);
+		min  = readb(&rtc->bcdmin);
+		hour = readb(&rtc->bcdhour);
+		mday = readb(&rtc->bcddate);
+		wday = readb(&rtc->bcdday);
+		mon  = readb(&rtc->bcdmon);
+		year = readb(&rtc->bcdyear);
+	} while (sec != readb(&rtc->bcdsec));
+
+	/* read ALARM registers */
+	a_sec   = readb(&rtc->almsec);
+	a_min   = readb(&rtc->almmin);
+	a_hour  = readb(&rtc->almhour);
+	a_date  = readb(&rtc->almdate);
+	a_mon   = readb(&rtc->almmon);
+	a_year  = readb(&rtc->almyear);
+	a_armed = readb(&rtc->rtcalm);
+
+	/* disable access to RTC registers */
+	SetRTC_Access(RTC_DISABLE);
+
+#ifdef RTC_DEBUG
+	printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
+	       "hr: %02x min: %02x sec: %02x\n",
+	       year, mon, mday, wday, hour, min, sec);
+	printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: "
+	       "%02x min: %02x sec: %02x\n",
+	       a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec);
+#endif
+
+	tmp->tm_sec  = bcd2bin(sec & 0x7F);
+	tmp->tm_min  = bcd2bin(min & 0x7F);
+	tmp->tm_hour = bcd2bin(hour & 0x3F);
+	tmp->tm_mday = bcd2bin(mday & 0x3F);
+	tmp->tm_mon  = bcd2bin(mon & 0x1F);
+	tmp->tm_year = bcd2bin(year);
+	tmp->tm_wday = bcd2bin(wday & 0x07);
+	if (tmp->tm_year < 70)
+		tmp->tm_year += 2000;
+	else
+		tmp->tm_year += 1900;
+	tmp->tm_yday  = 0;
+	tmp->tm_isdst = 0;
+#ifdef RTC_DEBUG
+	printf("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);
+#endif
+
+	return 0;
+}
+
+int rtc_set(struct rtc_time *tmp)
+{
+	struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
+	uchar sec, min, hour, mday, wday, mon, year;
+
+#ifdef RTC_DEBUG
+	printf("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);
+#endif
+	year = bin2bcd(tmp->tm_year % 100);
+	mon  = bin2bcd(tmp->tm_mon);
+	wday = bin2bcd(tmp->tm_wday);
+	mday = bin2bcd(tmp->tm_mday);
+	hour = bin2bcd(tmp->tm_hour);
+	min  = bin2bcd(tmp->tm_min);
+	sec  = bin2bcd(tmp->tm_sec);
+
+	/* enable access to RTC registers */
+	SetRTC_Access(RTC_ENABLE);
+
+	/* write RTC registers */
+	writeb(sec, &rtc->bcdsec);
+	writeb(min, &rtc->bcdmin);
+	writeb(hour, &rtc->bcdhour);
+	writeb(mday, &rtc->bcddate);
+	writeb(wday, &rtc->bcdday);
+	writeb(mon, &rtc->bcdmon);
+	writeb(year, &rtc->bcdyear);
+
+	/* disable access to RTC registers */
+	SetRTC_Access(RTC_DISABLE);
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
+
+	writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon);
+	writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon);
+}
+
+#endif