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0e4a34bb | 1 | /* |
2 | * linux/arch/arm/mach-w90x900/clock.c | |
3 | * | |
4 | * Copyright (c) 2008 Nuvoton technology corporation | |
5 | * | |
6 | * Wan ZongShun <mcuos.com@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/clk.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/io.h> | |
23 | ||
24 | #include <mach/hardware.h> | |
25 | ||
26 | #include "clock.h" | |
27 | ||
28 | static DEFINE_SPINLOCK(clocks_lock); | |
29 | ||
30 | int clk_enable(struct clk *clk) | |
31 | { | |
32 | unsigned long flags; | |
33 | ||
34 | spin_lock_irqsave(&clocks_lock, flags); | |
35 | if (clk->enabled++ == 0) | |
36 | (clk->enable)(clk, 1); | |
37 | spin_unlock_irqrestore(&clocks_lock, flags); | |
38 | ||
39 | return 0; | |
40 | } | |
41 | EXPORT_SYMBOL(clk_enable); | |
42 | ||
43 | void clk_disable(struct clk *clk) | |
44 | { | |
45 | unsigned long flags; | |
46 | ||
47 | WARN_ON(clk->enabled == 0); | |
48 | ||
49 | spin_lock_irqsave(&clocks_lock, flags); | |
50 | if (--clk->enabled == 0) | |
51 | (clk->enable)(clk, 0); | |
52 | spin_unlock_irqrestore(&clocks_lock, flags); | |
53 | } | |
54 | EXPORT_SYMBOL(clk_disable); | |
55 | ||
56 | void w90x900_clk_enable(struct clk *clk, int enable) | |
57 | { | |
58 | unsigned int clocks = clk->cken; | |
59 | unsigned long clken; | |
60 | ||
61 | clken = __raw_readl(W90X900_VA_CLKPWR); | |
62 | ||
63 | if (enable) | |
64 | clken |= clocks; | |
65 | else | |
66 | clken &= ~clocks; | |
67 | ||
68 | __raw_writel(clken, W90X900_VA_CLKPWR); | |
69 | } | |
70 | ||
71 | void clks_register(struct clk_lookup *clks, size_t num) | |
72 | { | |
73 | int i; | |
74 | ||
75 | for (i = 0; i < num; i++) | |
76 | clkdev_add(&clks[i]); | |
77 | } |