1 files changed, 306 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/rtc/rx8025.c b/roms/u-boot/drivers/rtc/rx8025.c
new file mode 100644
index 000000000..e717dcbbf
--- /dev/null
+++ b/roms/u-boot/drivers/rtc/rx8025.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2007
+ * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
+ */
+
+/*
+ * Epson RX8025 RTC driver.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <i2c.h>
+#include <rtc.h>
+
+/*---------------------------------------------------------------------*/
+#undef DEBUG_RTC
+
+#ifdef DEBUG_RTC
+#define DEBUGR(fmt,args...) printf(fmt ,##args)
+#else
+#define DEBUGR(fmt,args...)
+#endif
+/*---------------------------------------------------------------------*/
+
+#ifndef CONFIG_SYS_I2C_RTC_ADDR
+# define CONFIG_SYS_I2C_RTC_ADDR	0x32
+#endif
+
+#ifdef CONFIG_DM_RTC
+#define DEV_TYPE struct udevice
+#else
+/* Local udevice */
+struct ludevice {
+	u8 chip;
+};
+
+#define DEV_TYPE struct ludevice
+
+#endif
+
+/*
+ * RTC register addresses
+ */
+#define RTC_SEC_REG_ADDR	0x00
+#define RTC_MIN_REG_ADDR	0x01
+#define RTC_HR_REG_ADDR		0x02
+#define RTC_DAY_REG_ADDR	0x03
+#define RTC_DATE_REG_ADDR	0x04
+#define RTC_MON_REG_ADDR	0x05
+#define RTC_YR_REG_ADDR		0x06
+
+#define RTC_CTL1_REG_ADDR	0x0e
+#define RTC_CTL2_REG_ADDR	0x0f
+
+/*
+ * Control register 1 bits
+ */
+#define RTC_CTL1_BIT_2412	0x20
+
+/*
+ * Control register 2 bits
+ */
+#define RTC_CTL2_BIT_PON	0x10
+#define RTC_CTL2_BIT_VDET	0x40
+#define RTC_CTL2_BIT_XST	0x20
+#define RTC_CTL2_BIT_VDSL	0x80
+
+/*
+ * Note: the RX8025 I2C RTC requires register
+ * reads and write to consist of a single bus
+ * cycle. It is not allowed to write the register
+ * address in a first cycle that is terminated by
+ * a STOP condition. The chips needs a 'restart'
+ * sequence (start sequence without a prior stop).
+ * This driver has been written for a 4xx board.
+ * U-Boot's 4xx i2c driver is currently not capable
+ * to generate such cycles to some work arounds
+ * are used.
+ */
+
+/* static uchar rtc_read (uchar reg); */
+#ifdef CONFIG_DM_RTC
+/*
+ * on mpc85xx based board with DM and offset len 1
+ * accessing rtc works fine. May we can drop this ?
+ */
+#define rtc_read(reg) buf[(reg) & 0xf]
+#else
+#define rtc_read(reg) buf[((reg) + 1) & 0xf]
+#endif
+
+static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val);
+
+/*
+ * Get the current time from the RTC
+ */
+static int rx8025_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp)
+{
+	int rel = 0;
+	uchar sec, min, hour, mday, wday, mon, year, ctl2;
+	uchar buf[16];
+
+#ifdef CONFIG_DM_RTC
+	if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
+#else
+	if (i2c_read(dev->chip, 0, 0, buf, 16)) {
+#endif
+		printf("Error reading from RTC\n");
+		return -EIO;
+	}
+
+	sec = rtc_read(RTC_SEC_REG_ADDR);
+	min = rtc_read(RTC_MIN_REG_ADDR);
+	hour = rtc_read(RTC_HR_REG_ADDR);
+	wday = rtc_read(RTC_DAY_REG_ADDR);
+	mday = rtc_read(RTC_DATE_REG_ADDR);
+	mon = rtc_read(RTC_MON_REG_ADDR);
+	year = rtc_read(RTC_YR_REG_ADDR);
+
+	DEBUGR("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
+	       "hr: %02x min: %02x sec: %02x\n",
+	       year, mon, mday, wday, hour, min, sec);
+
+	/* dump status */
+	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
+	if (ctl2 & RTC_CTL2_BIT_PON) {
+		printf("RTC: power-on detected\n");
+		rel = -1;
+	}
+
+	if (ctl2 & RTC_CTL2_BIT_VDET) {
+		printf("RTC: voltage drop detected\n");
+		rel = -1;
+	}
+
+	if (!(ctl2 & RTC_CTL2_BIT_XST)) {
+		printf("RTC: oscillator stop detected\n");
+		rel = -1;
+	}
+
+	tmp->tm_sec  = bcd2bin(sec & 0x7F);
+	tmp->tm_min  = bcd2bin(min & 0x7F);
+	if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
+		tmp->tm_hour = bcd2bin(hour & 0x3F);
+	else
+		tmp->tm_hour = bcd2bin(hour & 0x1F) % 12 +
+			       ((hour & 0x20) ? 12 : 0);
+
+	tmp->tm_mday = bcd2bin (mday & 0x3F);
+	tmp->tm_mon  = bcd2bin (mon & 0x1F);
+	tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
+	tmp->tm_wday = bcd2bin (wday & 0x07);
+	tmp->tm_yday = 0;
+	tmp->tm_isdst= 0;
+
+	DEBUGR("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 rel;
+}
+
+/*
+ * Set the RTC
+ */
+static int rx8025_rtc_set(DEV_TYPE *dev, const struct rtc_time *tmp)
+{
+	DEBUGR("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);
+
+	if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
+		printf("WARNING: year should be between 1970 and 2069!\n");
+
+	if (rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min)))
+		return -EIO;
+
+	if (rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec)))
+		return -EIO;
+
+	return rtc_write(dev, RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
+}
+
+/*
+ * Reset the RTC
+ */
+static int rx8025_rtc_reset(DEV_TYPE *dev)
+{
+	uchar buf[16];
+	uchar ctl2;
+
+#ifdef CONFIG_DM_RTC
+	if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
+#else
+	if (i2c_read(dev->chip, 0, 0, buf, 16)) {
+#endif
+		printf("Error reading from RTC\n");
+		return -EIO;
+	}
+
+	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
+	ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
+	ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
+
+	return rtc_write(dev, RTC_CTL2_REG_ADDR, ctl2);
+}
+
+/*
+ * Helper functions
+ */
+static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val)
+{
+	uchar buf[2];
+	buf[0] = reg << 4;
+	buf[1] = val;
+
+#ifdef CONFIG_DM_RTC
+	if (dm_i2c_write(dev, 0, buf, 2)) {
+#else
+	if (i2c_write(dev->chip, 0, 0, buf, 2) != 0) {
+#endif
+		printf("Error writing to RTC\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_DM_RTC
+static int rx8025_probe(struct udevice *dev)
+{
+	uchar buf[16];
+	int ret = 0;
+
+	if (i2c_get_chip_offset_len(dev) != 1)
+		ret = i2c_set_chip_offset_len(dev, 1);
+
+	if (ret)
+		return ret;
+
+	return dm_i2c_read(dev, 0, buf, sizeof(buf));
+}
+
+static const struct rtc_ops rx8025_rtc_ops = {
+	.get = rx8025_rtc_get,
+	.set = rx8025_rtc_set,
+	.reset = rx8025_rtc_reset,
+};
+
+static const struct udevice_id rx8025_rtc_ids[] = {
+	{ .compatible = "epson,rx8025" },
+	{ }
+};
+
+U_BOOT_DRIVER(rx8010sj_rtc) = {
+	.name	  = "rx8025_rtc",
+	.id	      = UCLASS_RTC,
+	.probe    = rx8025_probe,
+	.of_match = rx8025_rtc_ids,
+	.ops	  = &rx8025_rtc_ops,
+};
+#else
+int rtc_get(struct rtc_time *tm)
+{
+	struct ludevice dev = {
+		.chip = CONFIG_SYS_I2C_RTC_ADDR,
+	};
+
+	return rx8025_rtc_get(&dev, tm);
+}
+
+int rtc_set(struct rtc_time *tm)
+{
+	struct ludevice dev = {
+		.chip = CONFIG_SYS_I2C_RTC_ADDR,
+	};
+
+	return rx8025_rtc_set(&dev, tm);
+}
+
+void rtc_reset(void)
+{
+	struct ludevice dev = {
+		.chip = CONFIG_SYS_I2C_RTC_ADDR,
+	};
+
+	rx8025_rtc_reset(&dev);
+}
+#endif