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9d9f78ed MT |
1 | /* |
2 | * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com> | |
3 | * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Fixed rate clock implementation | |
10 | */ | |
11 | ||
12 | #include <linux/clk-provider.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/err.h> | |
17 | ||
18 | /* | |
19 | * DOC: basic fixed-rate clock that cannot gate | |
20 | * | |
21 | * Traits of this clock: | |
22 | * prepare - clk_(un)prepare only ensures parents are prepared | |
23 | * enable - clk_enable only ensures parents are enabled | |
24 | * rate - rate is always a fixed value. No clk_set_rate support | |
25 | * parent - fixed parent. No clk_set_parent support | |
26 | */ | |
27 | ||
28 | #define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw) | |
29 | ||
30 | static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw *hw, | |
31 | unsigned long parent_rate) | |
32 | { | |
33 | return to_clk_fixed_rate(hw)->fixed_rate; | |
34 | } | |
35 | EXPORT_SYMBOL_GPL(clk_fixed_rate_recalc_rate); | |
36 | ||
37 | struct clk_ops clk_fixed_rate_ops = { | |
38 | .recalc_rate = clk_fixed_rate_recalc_rate, | |
39 | }; | |
40 | EXPORT_SYMBOL_GPL(clk_fixed_rate_ops); | |
41 | ||
42 | struct clk *clk_register_fixed_rate(struct device *dev, const char *name, | |
43 | const char *parent_name, unsigned long flags, | |
44 | unsigned long fixed_rate) | |
45 | { | |
46 | struct clk_fixed_rate *fixed; | |
47 | char **parent_names = NULL; | |
48 | u8 len; | |
49 | ||
50 | fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL); | |
51 | ||
52 | if (!fixed) { | |
53 | pr_err("%s: could not allocate fixed clk\n", __func__); | |
54 | return ERR_PTR(-ENOMEM); | |
55 | } | |
56 | ||
57 | /* struct clk_fixed_rate assignments */ | |
58 | fixed->fixed_rate = fixed_rate; | |
59 | ||
60 | if (parent_name) { | |
61 | parent_names = kmalloc(sizeof(char *), GFP_KERNEL); | |
62 | ||
63 | if (! parent_names) | |
64 | goto out; | |
65 | ||
66 | len = sizeof(char) * strlen(parent_name); | |
67 | ||
68 | parent_names[0] = kmalloc(len, GFP_KERNEL); | |
69 | ||
70 | if (!parent_names[0]) | |
71 | goto out; | |
72 | ||
73 | strncpy(parent_names[0], parent_name, len); | |
74 | } | |
75 | ||
76 | out: | |
77 | return clk_register(dev, name, | |
78 | &clk_fixed_rate_ops, &fixed->hw, | |
79 | parent_names, | |
80 | (parent_name ? 1 : 0), | |
81 | flags); | |
82 | } |