arm64: Add ARCH Timer

SoC sdm845 uses ARCH Timer

Change-Id: I45e2d4d2c16a2cded3df20d393d2b8820050ac80
Signed-off-by: T Michael Turney <mturney@codeaurora.org>
Reviewed-on: https://review.coreboot.org/25612
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/arch/arm64/arch_timer.c b/src/arch/arm64/arch_timer.c
new file mode 100644
index 0000000000..e7f3732b0e
--- /dev/null
+++ b/src/arch/arm64/arch_timer.c
@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018, The Linux Foundation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <timer.h>
+#include <arch/lib_helpers.h>
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	uint64_t tvalue = raw_read_cntpct_el0();
+	uint32_t tfreq  = raw_read_cntfrq_el0();
+	long usecs = (tvalue * 1000000) / tfreq;
+	mono_time_set_usecs(mt, usecs);
+}