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8ad68bbf CM |
1 | /* |
2 | * linux/arch/arm/mach-realview/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> | |
16 | ||
17 | #include <asm/semaphore.h> | |
18 | #include <asm/hardware/clock.h> | |
19 | #include <asm/hardware/icst307.h> | |
20 | ||
21 | #include "clock.h" | |
22 | ||
23 | static LIST_HEAD(clocks); | |
24 | static DECLARE_MUTEX(clocks_sem); | |
25 | ||
26 | struct clk *clk_get(struct device *dev, const char *id) | |
27 | { | |
28 | struct clk *p, *clk = ERR_PTR(-ENOENT); | |
29 | ||
30 | down(&clocks_sem); | |
31 | list_for_each_entry(p, &clocks, node) { | |
32 | if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { | |
33 | clk = p; | |
34 | break; | |
35 | } | |
36 | } | |
37 | up(&clocks_sem); | |
38 | ||
39 | return clk; | |
40 | } | |
41 | EXPORT_SYMBOL(clk_get); | |
42 | ||
43 | void clk_put(struct clk *clk) | |
44 | { | |
45 | module_put(clk->owner); | |
46 | } | |
47 | EXPORT_SYMBOL(clk_put); | |
48 | ||
49 | int clk_enable(struct clk *clk) | |
50 | { | |
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL(clk_enable); | |
54 | ||
55 | void clk_disable(struct clk *clk) | |
56 | { | |
57 | } | |
58 | EXPORT_SYMBOL(clk_disable); | |
59 | ||
60 | int clk_use(struct clk *clk) | |
61 | { | |
62 | return 0; | |
63 | } | |
64 | EXPORT_SYMBOL(clk_use); | |
65 | ||
66 | void clk_unuse(struct clk *clk) | |
67 | { | |
68 | } | |
69 | EXPORT_SYMBOL(clk_unuse); | |
70 | ||
71 | unsigned long clk_get_rate(struct clk *clk) | |
72 | { | |
73 | return clk->rate; | |
74 | } | |
75 | EXPORT_SYMBOL(clk_get_rate); | |
76 | ||
77 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
78 | { | |
79 | return rate; | |
80 | } | |
81 | EXPORT_SYMBOL(clk_round_rate); | |
82 | ||
83 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
84 | { | |
85 | int ret = -EIO; | |
86 | ||
87 | if (clk->setvco) { | |
88 | struct icst307_vco vco; | |
89 | ||
90 | vco = icst307_khz_to_vco(clk->params, rate / 1000); | |
91 | clk->rate = icst307_khz(clk->params, vco) * 1000; | |
92 | ||
93 | printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", | |
94 | clk->name, vco.s, vco.r, vco.v); | |
95 | ||
96 | clk->setvco(clk, vco); | |
97 | ret = 0; | |
98 | } | |
99 | return ret; | |
100 | } | |
101 | EXPORT_SYMBOL(clk_set_rate); | |
102 | ||
103 | /* | |
104 | * These are fixed clocks. | |
105 | */ | |
106 | static struct clk kmi_clk = { | |
107 | .name = "KMIREFCLK", | |
108 | .rate = 24000000, | |
109 | }; | |
110 | ||
111 | static struct clk uart_clk = { | |
112 | .name = "UARTCLK", | |
113 | .rate = 24000000, | |
114 | }; | |
115 | ||
116 | static struct clk mmci_clk = { | |
117 | .name = "MCLK", | |
118 | .rate = 33000000, | |
119 | }; | |
120 | ||
121 | int clk_register(struct clk *clk) | |
122 | { | |
123 | down(&clocks_sem); | |
124 | list_add(&clk->node, &clocks); | |
125 | up(&clocks_sem); | |
126 | return 0; | |
127 | } | |
128 | EXPORT_SYMBOL(clk_register); | |
129 | ||
130 | void clk_unregister(struct clk *clk) | |
131 | { | |
132 | down(&clocks_sem); | |
133 | list_del(&clk->node); | |
134 | up(&clocks_sem); | |
135 | } | |
136 | EXPORT_SYMBOL(clk_unregister); | |
137 | ||
138 | static int __init clk_init(void) | |
139 | { | |
140 | clk_register(&kmi_clk); | |
141 | clk_register(&uart_clk); | |
142 | clk_register(&mmci_clk); | |
143 | return 0; | |
144 | } | |
145 | arch_initcall(clk_init); |