1 files changed, 101 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/drivers/rtc/rtc4543.c b/qemu/roms/u-boot/drivers/rtc/rtc4543.c
new file mode 100644
index 000000000..8d36edd65
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/rtc/rtc4543.c
@@ -0,0 +1,101 @@
+/*
+ * (C) Copyright 2008, 2009
+ * Andreas Pfefferle, DENX Software Engineering, ap@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <command.h>
+#include <config.h>
+#include <rtc.h>
+#include <tws.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+/*
+ * Note: The acrobatics below is due to the hideously ingenius idea of
+ * the chip designers.  As the chip does not allow register
+ * addressing, all values need to be read and written in one go.  Sure
+ * enough, the 'wday' field (0-6) is transferred using the economic
+ * number of 4 bits right in the middle of the packet.....
+ */
+
+int rtc_get(struct rtc_time *tm)
+{
+	int rel = 0;
+	uchar buffer[7];
+
+	memset(buffer, 0, 7);
+
+	/* Read 52 bits into our buffer */
+	tws_read(buffer, 52);
+
+	tm->tm_sec  = bcd2bin( buffer[0] & 0x7F);
+	tm->tm_min  = bcd2bin( buffer[1] & 0x7F);
+	tm->tm_hour = bcd2bin( buffer[2] & 0x3F);
+	tm->tm_wday = bcd2bin( buffer[3] & 0x07);
+	tm->tm_mday = bcd2bin((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4);
+	tm->tm_mon  = bcd2bin((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4);
+	tm->tm_year = bcd2bin((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000;
+	tm->tm_yday = 0;
+	tm->tm_isdst = 0;
+
+	if (tm->tm_sec & 0x80) {
+		puts("### Warning: RTC Low Voltage - date/time not reliable\n");
+		rel = -1;
+	}
+
+	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+		tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+	return rel;
+}
+
+int rtc_set(struct rtc_time *tm)
+{
+	uchar buffer[7];
+	uchar tmp;
+
+	debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+		tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+	memset(buffer, 0, 7);
+	buffer[0] = bin2bcd(tm->tm_sec);
+	buffer[1] = bin2bcd(tm->tm_min);
+	buffer[2] = bin2bcd(tm->tm_hour);
+	buffer[3] = bin2bcd(tm->tm_wday);
+	tmp = bin2bcd(tm->tm_mday);
+	buffer[3] |= (tmp & 0x0F) << 4;
+	buffer[4] =  (tmp & 0xF0) >> 4;
+	tmp = bin2bcd(tm->tm_mon);
+	buffer[4] |= (tmp & 0x0F) << 4;
+	buffer[5] =  (tmp & 0xF0) >> 4;
+	tmp = bin2bcd(tm->tm_year  % 100);
+	buffer[5] |= (tmp & 0x0F) << 4;
+	buffer[6] =  (tmp & 0xF0) >> 4;
+
+	/* Write the resulting 52 bits to device */
+	tws_write(buffer, 52);
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	struct rtc_time tmp;
+
+	tmp.tm_sec = 0;
+	tmp.tm_min = 0;
+	tmp.tm_hour = 0;
+	tmp.tm_wday = 4;
+	tmp.tm_mday = 1;
+	tmp.tm_mon = 1;
+	tmp.tm_year = 2000;
+	rtc_set(&tmp);
+}
+
+#endif