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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> | |
f8ce2547 | 16 | #include <linux/clk.h> |
8ad68bbf CM |
17 | |
18 | #include <asm/semaphore.h> | |
8ad68bbf CM |
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 | ||
8ad68bbf CM |
60 | unsigned long clk_get_rate(struct clk *clk) |
61 | { | |
62 | return clk->rate; | |
63 | } | |
64 | EXPORT_SYMBOL(clk_get_rate); | |
65 | ||
66 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
67 | { | |
68 | return rate; | |
69 | } | |
70 | EXPORT_SYMBOL(clk_round_rate); | |
71 | ||
72 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
73 | { | |
74 | int ret = -EIO; | |
75 | ||
76 | if (clk->setvco) { | |
77 | struct icst307_vco vco; | |
78 | ||
79 | vco = icst307_khz_to_vco(clk->params, rate / 1000); | |
80 | clk->rate = icst307_khz(clk->params, vco) * 1000; | |
81 | ||
82 | printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", | |
83 | clk->name, vco.s, vco.r, vco.v); | |
84 | ||
85 | clk->setvco(clk, vco); | |
86 | ret = 0; | |
87 | } | |
88 | return ret; | |
89 | } | |
90 | EXPORT_SYMBOL(clk_set_rate); | |
91 | ||
92 | /* | |
93 | * These are fixed clocks. | |
94 | */ | |
95 | static struct clk kmi_clk = { | |
96 | .name = "KMIREFCLK", | |
97 | .rate = 24000000, | |
98 | }; | |
99 | ||
100 | static struct clk uart_clk = { | |
101 | .name = "UARTCLK", | |
102 | .rate = 24000000, | |
103 | }; | |
104 | ||
105 | static struct clk mmci_clk = { | |
106 | .name = "MCLK", | |
107 | .rate = 33000000, | |
108 | }; | |
109 | ||
110 | int clk_register(struct clk *clk) | |
111 | { | |
112 | down(&clocks_sem); | |
113 | list_add(&clk->node, &clocks); | |
114 | up(&clocks_sem); | |
115 | return 0; | |
116 | } | |
117 | EXPORT_SYMBOL(clk_register); | |
118 | ||
119 | void clk_unregister(struct clk *clk) | |
120 | { | |
121 | down(&clocks_sem); | |
122 | list_del(&clk->node); | |
123 | up(&clocks_sem); | |
124 | } | |
125 | EXPORT_SYMBOL(clk_unregister); | |
126 | ||
127 | static int __init clk_init(void) | |
128 | { | |
129 | clk_register(&kmi_clk); | |
130 | clk_register(&uart_clk); | |
131 | clk_register(&mmci_clk); | |
132 | return 0; | |
133 | } | |
134 | arch_initcall(clk_init); |