| Shawn Guo | 23b5e15 | 2012-04-29 00:02:34 +0800 | [diff] [blame] | 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 | |
| 17 | DEFINE_SPINLOCK(mxs_lock); |
| 18 | |
| 19 | int mxs_clk_wait(void __iomem *reg, u8 shift) |
| 20 | { |
| 21 | unsigned long timeout = jiffies + msecs_to_jiffies(10); |
| 22 | |
| 23 | while (readl_relaxed(reg) & (1 << shift)) |
| 24 | if (time_after(jiffies, timeout)) |
| 25 | return -ETIMEDOUT; |
| 26 | |
| 27 | return 0; |
| 28 | } |