drivers/clk/mxs/clk.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/spinlock.h>
  16 #include "clk.h"
  17
  18 DEFINE_SPINLOCK(mxs_lock);
  19
  20 int mxs_clk_wait(void __iomem *reg, u8 shift)
  21 {
  22         unsigned long timeout = jiffies + msecs_to_jiffies(10);
  23
  24         while (readl_relaxed(reg) & (1 << shift))
  25                 if (time_after(jiffies, timeout))
  26                         return -ETIMEDOUT;
  27
  28         return 0;
  29 }