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5f97f7f9 HS |
1 | /* |
2 | * Clock management for AT32AP CPUs | |
3 | * | |
4 | * Copyright (C) 2006 Atmel Corporation | |
5 | * | |
6 | * Based on arch/arm/mach-at91rm9200/clock.c | |
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 | { | |
23cebe22 HS |
66 | if (clk->users == 0) { |
67 | printk(KERN_ERR "%s: mismatched disable\n", clk->name); | |
68 | WARN_ON(1); | |
69 | return; | |
70 | } | |
5f97f7f9 HS |
71 | |
72 | if (--clk->users == 0 && clk->mode) | |
73 | clk->mode(clk, 0); | |
74 | if (clk->parent) | |
75 | __clk_disable(clk->parent); | |
76 | } | |
77 | ||
78 | void clk_disable(struct clk *clk) | |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | spin_lock_irqsave(&clk_lock, flags); | |
83 | __clk_disable(clk); | |
84 | spin_unlock_irqrestore(&clk_lock, flags); | |
85 | } | |
86 | EXPORT_SYMBOL(clk_disable); | |
87 | ||
88 | unsigned long clk_get_rate(struct clk *clk) | |
89 | { | |
90 | unsigned long flags; | |
91 | unsigned long rate; | |
92 | ||
93 | spin_lock_irqsave(&clk_lock, flags); | |
94 | rate = clk->get_rate(clk); | |
95 | spin_unlock_irqrestore(&clk_lock, flags); | |
96 | ||
97 | return rate; | |
98 | } | |
99 | EXPORT_SYMBOL(clk_get_rate); | |
100 | ||
101 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
102 | { | |
103 | unsigned long flags, actual_rate; | |
104 | ||
105 | if (!clk->set_rate) | |
106 | return -ENOSYS; | |
107 | ||
108 | spin_lock_irqsave(&clk_lock, flags); | |
109 | actual_rate = clk->set_rate(clk, rate, 0); | |
110 | spin_unlock_irqrestore(&clk_lock, flags); | |
111 | ||
112 | return actual_rate; | |
113 | } | |
114 | EXPORT_SYMBOL(clk_round_rate); | |
115 | ||
116 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
117 | { | |
118 | unsigned long flags; | |
119 | long ret; | |
120 | ||
121 | if (!clk->set_rate) | |
122 | return -ENOSYS; | |
123 | ||
124 | spin_lock_irqsave(&clk_lock, flags); | |
125 | ret = clk->set_rate(clk, rate, 1); | |
126 | spin_unlock_irqrestore(&clk_lock, flags); | |
127 | ||
128 | return (ret < 0) ? ret : 0; | |
129 | } | |
130 | EXPORT_SYMBOL(clk_set_rate); | |
131 | ||
132 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
133 | { | |
134 | unsigned long flags; | |
135 | int ret; | |
136 | ||
137 | if (!clk->set_parent) | |
138 | return -ENOSYS; | |
139 | ||
140 | spin_lock_irqsave(&clk_lock, flags); | |
141 | ret = clk->set_parent(clk, parent); | |
142 | spin_unlock_irqrestore(&clk_lock, flags); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | EXPORT_SYMBOL(clk_set_parent); | |
147 | ||
148 | struct clk *clk_get_parent(struct clk *clk) | |
149 | { | |
150 | return clk->parent; | |
151 | } | |
152 | EXPORT_SYMBOL(clk_get_parent); |