Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6
[linux-2.6] / arch / arm / mach-pxa / clock.c
1 /*
2  *  linux/arch/arm/mach-sa1100/clock.c
3  */
4 #include <linux/module.h>
5 #include <linux/kernel.h>
6 #include <linux/list.h>
7 #include <linux/errno.h>
8 #include <linux/err.h>
9 #include <linux/string.h>
10 #include <linux/clk.h>
11 #include <linux/spinlock.h>
12 #include <linux/platform_device.h>
13 #include <linux/delay.h>
14
15 #include <asm/clkdev.h>
16 #include <mach/pxa2xx-regs.h>
17 #include <mach/hardware.h>
18
19 #include "devices.h"
20 #include "generic.h"
21 #include "clock.h"
22
23 static DEFINE_SPINLOCK(clocks_lock);
24
25 int clk_enable(struct clk *clk)
26 {
27         unsigned long flags;
28
29         spin_lock_irqsave(&clocks_lock, flags);
30         if (clk->enabled++ == 0)
31                 clk->ops->enable(clk);
32         spin_unlock_irqrestore(&clocks_lock, flags);
33
34         if (clk->delay)
35                 udelay(clk->delay);
36
37         return 0;
38 }
39 EXPORT_SYMBOL(clk_enable);
40
41 void clk_disable(struct clk *clk)
42 {
43         unsigned long flags;
44
45         WARN_ON(clk->enabled == 0);
46
47         spin_lock_irqsave(&clocks_lock, flags);
48         if (--clk->enabled == 0)
49                 clk->ops->disable(clk);
50         spin_unlock_irqrestore(&clocks_lock, flags);
51 }
52 EXPORT_SYMBOL(clk_disable);
53
54 unsigned long clk_get_rate(struct clk *clk)
55 {
56         unsigned long rate;
57
58         rate = clk->rate;
59         if (clk->ops->getrate)
60                 rate = clk->ops->getrate(clk);
61
62         return rate;
63 }
64 EXPORT_SYMBOL(clk_get_rate);
65
66
67 void clk_cken_enable(struct clk *clk)
68 {
69         CKEN |= 1 << clk->cken;
70 }
71
72 void clk_cken_disable(struct clk *clk)
73 {
74         CKEN &= ~(1 << clk->cken);
75 }
76
77 const struct clkops clk_cken_ops = {
78         .enable         = clk_cken_enable,
79         .disable        = clk_cken_disable,
80 };
81
82 void clks_register(struct clk_lookup *clks, size_t num)
83 {
84         int i;
85
86         for (i = 0; i < num; i++)
87                 clkdev_add(&clks[i]);
88 }