1 files changed, 62 insertions, 0 deletions
diff --git a/arch/nios2/lib/clock.c b/arch/nios2/lib/clock.c
new file mode 100644
index 0000000000..05008be793
--- /dev/null
+++ b/arch/nios2/lib/clock.c
@@ -0,0 +1,62 @@
+/*
+ * (C) Copyright 2011 - Franck JULLIEN <elec4fun@gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <clock.h>
+#include <init.h>
+#include <asm/nios2-io.h>
+#include <asm/io.h>
+
+static struct nios_timer *timer = (struct nios_timer *)NIOS_SOPC_TIMER_BASE;
+
+static uint64_t nios_clocksource_read(void)
+{
+	uint64_t value;
+
+	writew(0x5555, &timer->snapl);       /* Dummy value*/
+	value = (uint64_t)((readw(&timer->snaph) << 16) + readw(&timer->snapl));
+
+	return ~value;
+}
+
+static struct clocksource cs = {
+	.read	= nios_clocksource_read,
+	.mask	= 0xffffffff,
+	.shift	= 12,
+};
+
+static int clocksource_init(void)
+{
+	writew(0, &timer->control);
+	writew(0xFFFF, &timer->periodl);
+	writew(0xFFFF, &timer->periodh);
+	writew(NIOS_TIMER_CONT | NIOS_TIMER_START, &timer->control);
+
+	cs.mult = clocksource_hz2mult(NIOS_SOPC_TIMER_FREQ, cs.shift);
+
+	init_clock(&cs);
+
+	return 0;
+}
+
+core_initcall(clocksource_init);
+