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path: root/drivers/clk/mxs/clk.c
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Diffstat (limited to 'drivers/clk/mxs/clk.c')
-rw-r--r--drivers/clk/mxs/clk.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/clk/mxs/clk.c b/drivers/clk/mxs/clk.c
new file mode 100644
index 000000000..5301bce89
--- /dev/null
+++ b/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;
+}