1 files changed, 82 insertions, 0 deletions
diff --git a/commands/uptime.c b/commands/uptime.c
new file mode 100644
index 0000000000..d67538631c
--- /dev/null
+++ b/commands/uptime.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <command.h>
+#include <clock.h>
+#include <getopt.h>
+#include <linux/math64.h>
+
+#define NSEC_PER_MINUTE	(NSEC_PER_SEC * 60LL)
+#define NSEC_PER_HOUR	(NSEC_PER_MINUTE * 60LL)
+#define NSEC_PER_DAY	(NSEC_PER_HOUR * 24LL)
+#define NSEC_PER_WEEK	(NSEC_PER_DAY * 7LL)
+
+static bool print_with_unit(u64 val, const char *unit, bool comma)
+{
+	if (!val)
+		return comma;
+
+	printf("%s%llu %s%s", comma ? ", " : "", val, unit, val > 1 ? "s" : "");
+	return true;
+}
+
+static int do_uptime(int argc, char *argv[])
+{
+	u64 timestamp, weeks, days, hours, minutes;
+	bool comma = false;
+	int opt;
+
+	timestamp = get_time_ns();
+
+	while((opt = getopt(argc, argv, "n")) > 0) {
+		switch(opt) {
+		case 'n':
+			printf("up %lluns\n", timestamp);
+			return 0;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
+
+	if (optind != argc)
+		return COMMAND_ERROR_USAGE;
+
+	printf("up ");
+
+	weeks = div64_u64_rem(timestamp, NSEC_PER_WEEK, &timestamp);
+	days = div64_u64_rem(timestamp, NSEC_PER_DAY, &timestamp);
+	hours = div64_u64_rem(timestamp, NSEC_PER_HOUR, &timestamp);
+	minutes = div64_u64_rem(timestamp, NSEC_PER_MINUTE, &timestamp);
+
+	comma = print_with_unit(weeks, "week", false);
+	comma = print_with_unit(days, "day", comma);
+	comma = print_with_unit(hours, "hour", comma);
+	comma = print_with_unit(minutes, "minute", comma);
+
+	if (!comma) {
+		u64 seconds = div64_u64_rem(timestamp, NSEC_PER_SEC, &timestamp);
+		print_with_unit(seconds, "second", false);
+	}
+
+	printf("\n");
+
+	return 0;
+}
+
+BAREBOX_CMD_HELP_START(uptime)
+BAREBOX_CMD_HELP_TEXT("This command formats the number of elapsed nanoseconds")
+BAREBOX_CMD_HELP_TEXT("as measured with the current clocksource")
+BAREBOX_CMD_HELP_TEXT("Note: Timekeeping is co-operative. If long running code does")
+BAREBOX_CMD_HELP_TEXT("not use delay/is_timeout/get_time_ns/getchar functions")
+BAREBOX_CMD_HELP_TEXT("timer may overrun resulting in incorrect results")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-n",     "output elapsed time in nanoseconds")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(uptime)
+	.cmd		= do_uptime,
+	BAREBOX_CMD_DESC("Tell how long barebox has been running")
+	BAREBOX_CMD_OPTS("[-n]")
+	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
+	BAREBOX_CMD_HELP(cmd_uptime_help)
+BAREBOX_CMD_END