Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / clk / mxs / clk.c

diff --git a/kernel/drivers/clk/mxs/clk.c b/kernel/drivers/clk/mxs/clk.c
new file mode 100644 (file)
index 0000000..5301bce
--- /dev/null
+++ b/kernel/drivers/clk/mxs/clk.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/spinlock.h>
+#include "clk.h"
+
+DEFINE_SPINLOCK(mxs_lock);
+
+int mxs_clk_wait(void __iomem *reg, u8 shift)
+{
+       unsigned long timeout = jiffies + msecs_to_jiffies(10);
+
+       while (readl_relaxed(reg) & (1 << shift))
+               if (time_after(jiffies, timeout))
+                       return -ETIMEDOUT;
+
+       return 0;
+}