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5f97f7f9 HS |
1 | /* |
2 | * Clock management for AT32AP CPUs | |
3 | * | |
4 | * Copyright (C) 2006 Atmel Corporation | |
5 | * | |
9d041268 | 6 | * Based on arch/arm/mach-at91/clock.c |
5f97f7f9 HS |
7 | * Copyright (C) 2005 David Brownell |
8 | * Copyright (C) 2005 Ivan Kokshaysky | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | #include <linux/clk.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | #include "clock.h" | |
20 | ||
21 | static spinlock_t clk_lock = SPIN_LOCK_UNLOCKED; | |
22 | ||
23 | struct clk *clk_get(struct device *dev, const char *id) | |
24 | { | |
25 | int i; | |
26 | ||
27 | for (i = 0; i < at32_nr_clocks; i++) { | |
28 | struct clk *clk = at32_clock_list[i]; | |
29 | ||
30 | if (clk->dev == dev && strcmp(id, clk->name) == 0) | |
31 | return clk; | |
32 | } | |
33 | ||
34 | return ERR_PTR(-ENOENT); | |
35 | } | |
36 | EXPORT_SYMBOL(clk_get); | |
37 | ||
38 | void clk_put(struct clk *clk) | |
39 | { | |
40 | /* clocks are static for now, we can't free them */ | |
41 | } | |
42 | EXPORT_SYMBOL(clk_put); | |
43 | ||
44 | static void __clk_enable(struct clk *clk) | |
45 | { | |
46 | if (clk->parent) | |
47 | __clk_enable(clk->parent); | |
48 | if (clk->users++ == 0 && clk->mode) | |
49 | clk->mode(clk, 1); | |
50 | } | |
51 | ||
52 | int clk_enable(struct clk *clk) | |
53 | { | |
54 | unsigned long flags; | |
55 | ||
56 | spin_lock_irqsave(&clk_lock, flags); | |
57 | __clk_enable(clk); | |
58 | spin_unlock_irqrestore(&clk_lock, flags); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | EXPORT_SYMBOL(clk_enable); | |
63 | ||
64 | static void __clk_disable(struct clk *clk) | |
65 | { | |
66 | BUG_ON(clk->users == 0); | |
67 | ||
68 | if (--clk->users == 0 && clk->mode) | |
69 | clk->mode(clk, 0); | |
70 | if (clk->parent) | |
71 | __clk_disable(clk->parent); | |
72 | } | |
73 | ||
74 | void clk_disable(struct clk *clk) | |
75 | { | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(&clk_lock, flags); | |
79 | __clk_disable(clk); | |
80 | spin_unlock_irqrestore(&clk_lock, flags); | |
81 | } | |
82 | EXPORT_SYMBOL(clk_disable); | |
83 | ||
84 | unsigned long clk_get_rate(struct clk *clk) | |
85 | { | |
86 | unsigned long flags; | |
87 | unsigned long rate; | |
88 | ||
89 | spin_lock_irqsave(&clk_lock, flags); | |
90 | rate = clk->get_rate(clk); | |
91 | spin_unlock_irqrestore(&clk_lock, flags); | |
92 | ||
93 | return rate; | |
94 | } | |
95 | EXPORT_SYMBOL(clk_get_rate); | |
96 | ||
97 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
98 | { | |
99 | unsigned long flags, actual_rate; | |
100 | ||
101 | if (!clk->set_rate) | |
102 | return -ENOSYS; | |
103 | ||
104 | spin_lock_irqsave(&clk_lock, flags); | |
105 | actual_rate = clk->set_rate(clk, rate, 0); | |
106 | spin_unlock_irqrestore(&clk_lock, flags); | |
107 | ||
108 | return actual_rate; | |
109 | } | |
110 | EXPORT_SYMBOL(clk_round_rate); | |
111 | ||
112 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
113 | { | |
114 | unsigned long flags; | |
115 | long ret; | |
116 | ||
117 | if (!clk->set_rate) | |
118 | return -ENOSYS; | |
119 | ||
120 | spin_lock_irqsave(&clk_lock, flags); | |
121 | ret = clk->set_rate(clk, rate, 1); | |
122 | spin_unlock_irqrestore(&clk_lock, flags); | |
123 | ||
124 | return (ret < 0) ? ret : 0; | |
125 | } | |
126 | EXPORT_SYMBOL(clk_set_rate); | |
127 | ||
128 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
129 | { | |
130 | unsigned long flags; | |
131 | int ret; | |
132 | ||
133 | if (!clk->set_parent) | |
134 | return -ENOSYS; | |
135 | ||
136 | spin_lock_irqsave(&clk_lock, flags); | |
137 | ret = clk->set_parent(clk, parent); | |
138 | spin_unlock_irqrestore(&clk_lock, flags); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | EXPORT_SYMBOL(clk_set_parent); | |
143 | ||
144 | struct clk *clk_get_parent(struct clk *clk) | |
145 | { | |
146 | return clk->parent; | |
147 | } | |
148 | EXPORT_SYMBOL(clk_get_parent); |