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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 | ||
db58e90f | 28 | #define SUBCLK 0x24 |
29 | ||
0e4a34bb | 30 | static DEFINE_SPINLOCK(clocks_lock); |
31 | ||
32 | int clk_enable(struct clk *clk) | |
33 | { | |
34 | unsigned long flags; | |
35 | ||
36 | spin_lock_irqsave(&clocks_lock, flags); | |
37 | if (clk->enabled++ == 0) | |
38 | (clk->enable)(clk, 1); | |
39 | spin_unlock_irqrestore(&clocks_lock, flags); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | EXPORT_SYMBOL(clk_enable); | |
44 | ||
45 | void clk_disable(struct clk *clk) | |
46 | { | |
47 | unsigned long flags; | |
48 | ||
e1ffaa55 MY |
49 | if (!clk) |
50 | return; | |
51 | ||
0e4a34bb | 52 | WARN_ON(clk->enabled == 0); |
53 | ||
54 | spin_lock_irqsave(&clocks_lock, flags); | |
55 | if (--clk->enabled == 0) | |
56 | (clk->enable)(clk, 0); | |
57 | spin_unlock_irqrestore(&clocks_lock, flags); | |
58 | } | |
59 | EXPORT_SYMBOL(clk_disable); | |
60 | ||
58b5369e | 61 | unsigned long clk_get_rate(struct clk *clk) |
62 | { | |
63 | return 15000000; | |
64 | } | |
65 | EXPORT_SYMBOL(clk_get_rate); | |
66 | ||
35c9221a | 67 | void nuc900_clk_enable(struct clk *clk, int enable) |
0e4a34bb | 68 | { |
69 | unsigned int clocks = clk->cken; | |
70 | unsigned long clken; | |
71 | ||
72 | clken = __raw_readl(W90X900_VA_CLKPWR); | |
73 | ||
74 | if (enable) | |
75 | clken |= clocks; | |
76 | else | |
77 | clken &= ~clocks; | |
78 | ||
79 | __raw_writel(clken, W90X900_VA_CLKPWR); | |
80 | } | |
81 | ||
35c9221a | 82 | void nuc900_subclk_enable(struct clk *clk, int enable) |
db58e90f | 83 | { |
84 | unsigned int clocks = clk->cken; | |
85 | unsigned long clken; | |
86 | ||
87 | clken = __raw_readl(W90X900_VA_CLKPWR + SUBCLK); | |
88 | ||
89 | if (enable) | |
90 | clken |= clocks; | |
91 | else | |
92 | clken &= ~clocks; | |
93 | ||
94 | __raw_writel(clken, W90X900_VA_CLKPWR + SUBCLK); | |
95 | } | |
bd7fefe1 AB |
96 | |
97 | /* dummy functions, should not be called */ | |
98 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
99 | { | |
100 | WARN_ON(clk); | |
101 | return 0; | |
102 | } | |
103 | EXPORT_SYMBOL(clk_round_rate); | |
104 | ||
105 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
106 | { | |
107 | WARN_ON(clk); | |
108 | return 0; | |
109 | } | |
110 | EXPORT_SYMBOL(clk_set_rate); | |
111 | ||
112 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
113 | { | |
114 | WARN_ON(clk); | |
115 | return 0; | |
116 | } | |
117 | EXPORT_SYMBOL(clk_set_parent); | |
118 | ||
119 | struct clk *clk_get_parent(struct clk *clk) | |
120 | { | |
121 | WARN_ON(clk); | |
122 | return NULL; | |
123 | } | |
124 | EXPORT_SYMBOL(clk_get_parent); |