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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-versatile/clock.c | |
3 | * | |
4 | * Copyright (C) 2004 ARM Limited. | |
5 | * Written by Deep Blue Solutions Limited. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/err.h> | |
4e57b681 | 16 | #include <linux/string.h> |
1da177e4 LT |
17 | |
18 | #include <asm/semaphore.h> | |
19 | #include <asm/hardware/clock.h> | |
20 | #include <asm/hardware/icst307.h> | |
21 | ||
22 | #include "clock.h" | |
23 | ||
24 | static LIST_HEAD(clocks); | |
25 | static DECLARE_MUTEX(clocks_sem); | |
26 | ||
27 | struct clk *clk_get(struct device *dev, const char *id) | |
28 | { | |
29 | struct clk *p, *clk = ERR_PTR(-ENOENT); | |
30 | ||
31 | down(&clocks_sem); | |
32 | list_for_each_entry(p, &clocks, node) { | |
33 | if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { | |
34 | clk = p; | |
35 | break; | |
36 | } | |
37 | } | |
38 | up(&clocks_sem); | |
39 | ||
40 | return clk; | |
41 | } | |
42 | EXPORT_SYMBOL(clk_get); | |
43 | ||
44 | void clk_put(struct clk *clk) | |
45 | { | |
46 | module_put(clk->owner); | |
47 | } | |
48 | EXPORT_SYMBOL(clk_put); | |
49 | ||
50 | int clk_enable(struct clk *clk) | |
51 | { | |
52 | return 0; | |
53 | } | |
54 | EXPORT_SYMBOL(clk_enable); | |
55 | ||
56 | void clk_disable(struct clk *clk) | |
57 | { | |
58 | } | |
59 | EXPORT_SYMBOL(clk_disable); | |
60 | ||
61 | int clk_use(struct clk *clk) | |
62 | { | |
63 | return 0; | |
64 | } | |
65 | EXPORT_SYMBOL(clk_use); | |
66 | ||
67 | void clk_unuse(struct clk *clk) | |
68 | { | |
69 | } | |
70 | EXPORT_SYMBOL(clk_unuse); | |
71 | ||
72 | unsigned long clk_get_rate(struct clk *clk) | |
73 | { | |
74 | return clk->rate; | |
75 | } | |
76 | EXPORT_SYMBOL(clk_get_rate); | |
77 | ||
78 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
79 | { | |
80 | return rate; | |
81 | } | |
82 | EXPORT_SYMBOL(clk_round_rate); | |
83 | ||
84 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
85 | { | |
86 | int ret = -EIO; | |
87 | ||
88 | if (clk->setvco) { | |
89 | struct icst307_vco vco; | |
90 | ||
91 | vco = icst307_khz_to_vco(clk->params, rate / 1000); | |
92 | clk->rate = icst307_khz(clk->params, vco) * 1000; | |
93 | ||
94 | printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", | |
95 | clk->name, vco.s, vco.r, vco.v); | |
96 | ||
97 | clk->setvco(clk, vco); | |
98 | ret = 0; | |
99 | } | |
100 | return ret; | |
101 | } | |
102 | EXPORT_SYMBOL(clk_set_rate); | |
103 | ||
104 | /* | |
105 | * These are fixed clocks. | |
106 | */ | |
107 | static struct clk kmi_clk = { | |
108 | .name = "KMIREFCLK", | |
109 | .rate = 24000000, | |
110 | }; | |
111 | ||
112 | static struct clk uart_clk = { | |
113 | .name = "UARTCLK", | |
114 | .rate = 24000000, | |
115 | }; | |
116 | ||
117 | static struct clk mmci_clk = { | |
118 | .name = "MCLK", | |
119 | .rate = 33000000, | |
120 | }; | |
121 | ||
122 | int clk_register(struct clk *clk) | |
123 | { | |
124 | down(&clocks_sem); | |
125 | list_add(&clk->node, &clocks); | |
126 | up(&clocks_sem); | |
127 | return 0; | |
128 | } | |
129 | EXPORT_SYMBOL(clk_register); | |
130 | ||
131 | void clk_unregister(struct clk *clk) | |
132 | { | |
133 | down(&clocks_sem); | |
134 | list_del(&clk->node); | |
135 | up(&clocks_sem); | |
136 | } | |
137 | EXPORT_SYMBOL(clk_unregister); | |
138 | ||
139 | static int __init clk_init(void) | |
140 | { | |
141 | clk_register(&kmi_clk); | |
142 | clk_register(&uart_clk); | |
143 | clk_register(&mmci_clk); | |
144 | return 0; | |
145 | } | |
146 | arch_initcall(clk_init); |