LXR linux/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
  18DEFINE_SPINLOCK(mxs_lock);
  19
  20int 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}
  30