1 /*
2 * linux/arch/arm/mach-sa1100/clock.c
3 */
4 #include <linux/module.h>
5 #include <linux/kernel.h>
6 #include <linux/clk.h>
7 #include <linux/spinlock.h>
8 #include <linux/delay.h>
9 #include <linux/clkdev.h>
10
11 #include "clock.h"
12
13 static DEFINE_SPINLOCK(clocks_lock);
14
clk_enable(struct clk * clk)15 int clk_enable(struct clk *clk)
16 {
17 unsigned long flags;
18
19 spin_lock_irqsave(&clocks_lock, flags);
20 if (clk->enabled++ == 0)
21 clk->ops->enable(clk);
22 spin_unlock_irqrestore(&clocks_lock, flags);
23
24 if (clk->delay)
25 udelay(clk->delay);
26
27 return 0;
28 }
29 EXPORT_SYMBOL(clk_enable);
30
clk_disable(struct clk * clk)31 void clk_disable(struct clk *clk)
32 {
33 unsigned long flags;
34
35 WARN_ON(clk->enabled == 0);
36
37 spin_lock_irqsave(&clocks_lock, flags);
38 if (--clk->enabled == 0)
39 clk->ops->disable(clk);
40 spin_unlock_irqrestore(&clocks_lock, flags);
41 }
42 EXPORT_SYMBOL(clk_disable);
43
clk_get_rate(struct clk * clk)44 unsigned long clk_get_rate(struct clk *clk)
45 {
46 unsigned long rate;
47
48 rate = clk->rate;
49 if (clk->ops->getrate)
50 rate = clk->ops->getrate(clk);
51
52 return rate;
53 }
54 EXPORT_SYMBOL(clk_get_rate);
55
clk_set_rate(struct clk * clk,unsigned long rate)56 int clk_set_rate(struct clk *clk, unsigned long rate)
57 {
58 unsigned long flags;
59 int ret = -EINVAL;
60
61 if (clk->ops->setrate) {
62 spin_lock_irqsave(&clocks_lock, flags);
63 ret = clk->ops->setrate(clk, rate);
64 spin_unlock_irqrestore(&clocks_lock, flags);
65 }
66
67 return ret;
68 }
69 EXPORT_SYMBOL(clk_set_rate);
70
clk_dummy_enable(struct clk * clk)71 void clk_dummy_enable(struct clk *clk)
72 {
73 }
74
clk_dummy_disable(struct clk * clk)75 void clk_dummy_disable(struct clk *clk)
76 {
77 }
78
79 const struct clkops clk_dummy_ops = {
80 .enable = clk_dummy_enable,
81 .disable = clk_dummy_disable,
82 };
83
84 struct clk clk_dummy = {
85 .ops = &clk_dummy_ops,
86 };
87