1 files changed, 142 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/rtc/pl031.c b/roms/u-boot/drivers/rtc/pl031.c
new file mode 100644
index 000000000..a1d376611
--- /dev/null
+++ b/roms/u-boot/drivers/rtc/pl031.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2008
+ * Gururaja Hebbar gururajakr@sanyo.co.in
+ *
+ * reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <errno.h>
+#include <log.h>
+#include <rtc.h>
+#include <asm/io.h>
+#include <asm/types.h>
+
+/*
+ * Register definitions
+ */
+#define	RTC_DR		0x00	/* Data read register */
+#define	RTC_MR		0x04	/* Match register */
+#define	RTC_LR		0x08	/* Data load register */
+#define	RTC_CR		0x0c	/* Control register */
+#define	RTC_IMSC	0x10	/* Interrupt mask and set register */
+#define	RTC_RIS		0x14	/* Raw interrupt status register */
+#define	RTC_MIS		0x18	/* Masked interrupt status register */
+#define	RTC_ICR		0x1c	/* Interrupt clear register */
+
+#define RTC_CR_START	(1 << 0)
+
+struct pl031_plat {
+	phys_addr_t base;
+};
+
+static inline u32 pl031_read_reg(struct udevice *dev, int reg)
+{
+	struct pl031_plat *pdata = dev_get_plat(dev);
+
+	return readl(pdata->base + reg);
+}
+
+static inline u32 pl031_write_reg(struct udevice *dev, int reg, u32 value)
+{
+	struct pl031_plat *pdata = dev_get_plat(dev);
+
+	return writel(value, pdata->base + reg);
+}
+
+/*
+ * Probe RTC device
+ */
+static int pl031_probe(struct udevice *dev)
+{
+	/* Enable RTC Start in Control register*/
+	pl031_write_reg(dev, RTC_CR, RTC_CR_START);
+
+	return 0;
+}
+
+/*
+ * Get the current time from the RTC
+ */
+static int pl031_get(struct udevice *dev, struct rtc_time *tm)
+{
+	unsigned long tim;
+
+	if (!tm)
+		return -EINVAL;
+
+	tim = pl031_read_reg(dev, RTC_DR);
+
+	rtc_to_tm(tim, tm);
+
+	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 0;
+}
+
+/*
+ * Set the RTC
+ */
+static int pl031_set(struct udevice *dev, const struct rtc_time *tm)
+{
+	unsigned long tim;
+
+	if (!tm)
+		return -EINVAL;
+
+	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);
+
+	/* Calculate number of seconds this incoming time represents */
+	tim = rtc_mktime(tm);
+
+	pl031_write_reg(dev, RTC_LR, tim);
+
+	return 0;
+}
+
+/*
+ * Reset the RTC. We set the date back to 1970-01-01.
+ */
+static int pl031_reset(struct udevice *dev)
+{
+	pl031_write_reg(dev, RTC_LR, 0);
+
+	return 0;
+}
+
+static const struct rtc_ops pl031_ops = {
+	.get = pl031_get,
+	.set = pl031_set,
+	.reset = pl031_reset,
+};
+
+static const struct udevice_id pl031_ids[] = {
+	{ .compatible = "arm,pl031" },
+	{ }
+};
+
+static int pl031_of_to_plat(struct udevice *dev)
+{
+	struct pl031_plat *pdata = dev_get_plat(dev);
+
+	pdata->base = dev_read_addr(dev);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(rtc_pl031) = {
+	.name	= "rtc-pl031",
+	.id	= UCLASS_RTC,
+	.of_match = pl031_ids,
+	.probe	= pl031_probe,
+	.of_to_plat = pl031_of_to_plat,
+	.plat_auto	= sizeof(struct pl031_plat),
+	.ops	= &pl031_ops,
+};