[PATCH 12/54] Add arch/nios2/lib/clock.c

[PATCH 12/54] Add arch/nios2/lib/clock.c

[franck.jullien]

From: Franck JULLIEN <franck.jullien@gmail.com>

Add arch/nios2/lib/clock.c

---
 arch/nios2/lib/clock.c |   57 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 57 insertions(+), 0 deletions(-)
 create mode 100644 arch/nios2/lib/clock.c

diff --git a/arch/nios2/lib/clock.c b/arch/nios2/lib/clock.c
new file mode 100644
index 0000000..dd08be7
--- /dev/null
+++ b/arch/nios2/lib/clock.c
@@ -0,0 +1,57 @@
+/*
+ * (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>
+
+static nios_timer_t *timer = (nios_timer_t *) NIOS_SOPC_TIMER_BASE;
+
+static uint64_t nios_clocksource_read(void)
+{
+        timer->snapl = 0x55;             /* Dummy value*/
+	return (uint64_t)(~((((uint64_t)timer->snaph) << (uint64_t)16) + (uint64_t)timer->snapl));
+}
+
+static struct clocksource cs = {
+	.read	= nios_clocksource_read,
+	.mask	= CLOCKSOURCE_MASK(32),
+	.shift	= 12,
+};
+
+static int clocksource_init (void)
+{      
+        timer->control = 0;
+        timer->periodl = 0xFFFF;
+        timer->periodh = 0xFFFF;       
+        timer->control = NIOS_TIMER_CONT | NIOS_TIMER_START;
+
+        cs.mult = clocksource_hz2mult(NIOS_SOPC_TIMER_FREQ, cs.shift);
+
+        init_clock(&cs);
+
+	return 0;
+}
+
+core_initcall(clocksource_init);
+
-- 
1.7.3.4


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