1 files changed, 58 insertions, 0 deletions
diff --git a/src/soc/marvell/armada38x/monotonic_timer.c b/src/soc/marvell/armada38x/monotonic_timer.c
new file mode 100644
index 0000000000..b314f1185e
--- /dev/null
+++ b/src/soc/marvell/armada38x/monotonic_timer.c
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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 <arch/io.h>
+#include <timer.h>
+#include <delay.h>
+
+#define TIMER_CTRL_REG 0xf1020300
+#define TIMER_RELOAD_REG 0xf1020310
+#define TIMER_REG 0xf1020314
+#define TIMER_RELOAD_VALUE 0xffffffff
+
+#define MHZ_NUM 25
+
+void init_timer(void)
+{
+	unsigned int reg;
+
+	/* Set the reload timer */
+	write32((void *)TIMER_RELOAD_REG, TIMER_RELOAD_VALUE);
+	/* Set the initial value to TIMER_RELOAD_VALUE - 1
+	 * (instead of TIMER_RELOAD_VALUE) to avoid 'fake'
+	 * overflow being detected in timer_monotonic_get
+	 * if it's called close enough with 'this' function */
+	write32((void *)TIMER_REG, TIMER_RELOAD_VALUE - 1);
+	reg = read32((const void *)TIMER_CTRL_REG);
+	/* Let it start counting */
+	reg |= 0x3;
+	write32((void *)TIMER_CTRL_REG, reg);
+}
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	static uint64_t total_ticks = 0;
+	uint64_t overflow = 0;
+	uint32_t current_ticks =
+		TIMER_RELOAD_VALUE - read32((const void *)TIMER_REG);
+
+	/* Assuming at most one overflow happened since last call */
+	if (current_ticks <= total_ticks)
+		overflow = 1ULL << 32;
+
+	total_ticks = (((total_ticks + overflow) >> 32) << 32) + current_ticks;
+	mono_time_set_usecs(mt, total_ticks / MHZ_NUM);
+}
+