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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 |
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