Merge tag 'efi-2021-01-rc2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2021-01-rc2

A software RTC driver is supplied for UEFI SCT testing.

The following UEFI related bugs are fixed:

* correct handling of daylight saving time in GetTime() and SetTime()
* handling of the gd register in function tracing on RISC-V
* disable U-Boot devices in ExitBootServices()

3 files changed, 92 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 63662001c26..d06d272e14b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -63,6 +63,17 @@ config RTC_DS3232
 	  Support for Dallas Semiconductor (now Maxim) DS3232 compatible
 	  Real Time Clock devices.
 
+config RTC_EMULATION
+	bool "Enable emulated RTC"
+	depends on DM_RTC
+	help
+	  On a board without hardware clock this software real time clock can be
+	  used. The build time is used to initialize the RTC. So you will have
+	  to adjust the time either manually using the 'date' command  or use
+	  the 'sntp' to update the RTC with the time from a network time server.
+	  See CONFIG_CMD_SNTP and CONFIG_BOOTP_NTPSERVER. The RTC time is
+	  advanced according to CPU ticks.
+
 config RTC_ISL1208
 	bool "Enable ISL1208 driver"
 	depends on DM_RTC
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 12eb449583a..ef66dc4bf02 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_RTC_DS164x) += ds164x.o
 obj-$(CONFIG_RTC_DS174x) += ds174x.o
 obj-$(CONFIG_RTC_DS3231) += ds3231.o
 obj-$(CONFIG_RTC_DS3232) += ds3232.o
+obj-$(CONFIG_RTC_EMULATION) += emul_rtc.o
 obj-$(CONFIG_RTC_FTRTC010) += ftrtc010.o
 obj-$(CONFIG_SANDBOX) += i2c_rtc_emul.o
 obj-$(CONFIG_RTC_IMXDI) += imxdi.o
diff --git a/drivers/rtc/emul_rtc.c b/drivers/rtc/emul_rtc.c
new file mode 100644
index 00000000000..c98c24bbb3d
--- /dev/null
+++ b/drivers/rtc/emul_rtc.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ *
+ * This driver emulates a real time clock based on timer ticks.
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <dm.h>
+#include <generated/timestamp_autogenerated.h>
+#include <rtc.h>
+
+/**
+ * struct emul_rtc - private data for emulated RTC driver
+ */
+struct emul_rtc {
+	/**
+	 * @offset_us: microseconds from 1970-01-01 to timer_get_us() base
+	 */
+	u64 offset_us;
+	/**
+	 * @isdst: daylight saving time
+	 */
+	int isdst;
+};
+
+static int emul_rtc_get(struct udevice *dev, struct rtc_time *time)
+{
+	struct emul_rtc *priv = dev_get_priv(dev);
+	u64 now;
+
+	if (!priv->offset_us) {
+		/* Use the build date as initial time */
+		priv->offset_us = U_BOOT_EPOCH * 1000000ULL - timer_get_us();
+		priv->isdst = -1;
+	}
+
+	now = timer_get_us() + priv->offset_us;
+	do_div(now, 1000000);
+	rtc_to_tm(now, time);
+	time->tm_isdst = priv->isdst;
+
+	return 0;
+}
+
+static int emul_rtc_set(struct udevice *dev, const struct rtc_time *time)
+{
+	struct emul_rtc *priv = dev_get_priv(dev);
+
+	if (time->tm_year < 1970)
+		return -EINVAL;
+
+	priv->offset_us = rtc_mktime(time) * 1000000ULL - timer_get_us();
+
+	if (time->tm_isdst > 0)
+		priv->isdst = 1;
+	else if (time->tm_isdst < 0)
+		priv->isdst = -1;
+	else
+		priv->isdst = 0;
+
+	return 0;
+}
+
+static const struct rtc_ops emul_rtc_ops = {
+	.get = emul_rtc_get,
+	.set = emul_rtc_set,
+};
+
+U_BOOT_DRIVER(rtc_emul) = {
+	.name	= "rtc_emul",
+	.id	= UCLASS_RTC,
+	.ops	= &emul_rtc_ops,
+	.priv_auto_alloc_size = sizeof(struct emul_rtc),
+};
+
+U_BOOT_DEVICE(rtc_emul) = {
+	.name	= "rtc_emul",
+};