1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/timer.c b/arch/arm/mach-uniphier/timer.c
new file mode 100644
index 0000000..adef08d
--- /dev/null
+++ b/arch/arm/mach-uniphier/timer.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2012-2014 Panasonic Corporation
+ *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <mach/arm-mpcore.h>
+
+#define PERIPHCLK (50 * 1000 * 1000) /* 50 MHz */
+#define PRESCALER ((PERIPHCLK) / (CONFIG_SYS_TIMER_RATE) - 1)
+
+static void *get_global_timer_base(void)
+{
+	void *val;
+
+	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (val) : : "memory");
+
+	return val + GLOBAL_TIMER_OFFSET;
+}
+
+unsigned long timer_read_counter(void)
+{
+	/*
+	 * ARM 64bit Global Timer is too much for our purpose.
+	 * We use only lower 32 bit of the timer counter.
+	 */
+	return readl(get_global_timer_base() + GTIMER_CNT_L);
+}
+
+int timer_init(void)
+{
+	/* enable timer */
+	writel(PRESCALER << 8 | 1, get_global_timer_base() + GTIMER_CTRL);
+
+	return 0;
+}