1
2
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
13static DEFINE_SPINLOCK(clocks_lock);
14
15int 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}
29EXPORT_SYMBOL(clk_enable);
30
31void 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}
42EXPORT_SYMBOL(clk_disable);
43
44unsigned 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}
54EXPORT_SYMBOL(clk_get_rate);
55
56int 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}
69EXPORT_SYMBOL(clk_set_rate);
70
71void clk_dummy_enable(struct clk *clk)
72{
73}
74
75void clk_dummy_disable(struct clk *clk)
76{
77}
78
79const struct clkops clk_dummy_ops = {
80 .enable = clk_dummy_enable,
81 .disable = clk_dummy_disable,
82};
83
84struct clk clk_dummy = {
85 .ops = &clk_dummy_ops,
86};
87
