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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> |
f8ce2547 | 17 | #include <linux/clk.h> |
00431707 | 18 | #include <linux/mutex.h> |
1da177e4 | 19 | |
1da177e4 LT |
20 | #include <asm/hardware/icst307.h> |
21 | ||
22 | #include "clock.h" | |
23 | ||
24 | static LIST_HEAD(clocks); | |
00431707 | 25 | static DEFINE_MUTEX(clocks_mutex); |
1da177e4 LT |
26 | |
27 | struct clk *clk_get(struct device *dev, const char *id) | |
28 | { | |
29 | struct clk *p, *clk = ERR_PTR(-ENOENT); | |
30 | ||
00431707 | 31 | mutex_lock(&clocks_mutex); |
1da177e4 LT |
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 | } | |
00431707 | 38 | mutex_unlock(&clocks_mutex); |
1da177e4 LT |
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 | ||
1da177e4 LT |
61 | unsigned long clk_get_rate(struct clk *clk) |
62 | { | |
63 | return clk->rate; | |
64 | } | |
65 | EXPORT_SYMBOL(clk_get_rate); | |
66 | ||
67 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
68 | { | |
69 | return rate; | |
70 | } | |
71 | EXPORT_SYMBOL(clk_round_rate); | |
72 | ||
73 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
74 | { | |
75 | int ret = -EIO; | |
76 | ||
77 | if (clk->setvco) { | |
78 | struct icst307_vco vco; | |
79 | ||
80 | vco = icst307_khz_to_vco(clk->params, rate / 1000); | |
81 | clk->rate = icst307_khz(clk->params, vco) * 1000; | |
82 | ||
83 | printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", | |
84 | clk->name, vco.s, vco.r, vco.v); | |
85 | ||
86 | clk->setvco(clk, vco); | |
87 | ret = 0; | |
88 | } | |
89 | return ret; | |
90 | } | |
91 | EXPORT_SYMBOL(clk_set_rate); | |
92 | ||
93 | /* | |
94 | * These are fixed clocks. | |
95 | */ | |
96 | static struct clk kmi_clk = { | |
97 | .name = "KMIREFCLK", | |
98 | .rate = 24000000, | |
99 | }; | |
100 | ||
101 | static struct clk uart_clk = { | |
102 | .name = "UARTCLK", | |
103 | .rate = 24000000, | |
104 | }; | |
105 | ||
106 | static struct clk mmci_clk = { | |
107 | .name = "MCLK", | |
7bfc0b2e | 108 | .rate = 24000000, |
1da177e4 LT |
109 | }; |
110 | ||
111 | int clk_register(struct clk *clk) | |
112 | { | |
00431707 | 113 | mutex_lock(&clocks_mutex); |
1da177e4 | 114 | list_add(&clk->node, &clocks); |
00431707 | 115 | mutex_unlock(&clocks_mutex); |
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | EXPORT_SYMBOL(clk_register); | |
119 | ||
120 | void clk_unregister(struct clk *clk) | |
121 | { | |
00431707 | 122 | mutex_lock(&clocks_mutex); |
1da177e4 | 123 | list_del(&clk->node); |
00431707 | 124 | mutex_unlock(&clocks_mutex); |
1da177e4 LT |
125 | } |
126 | EXPORT_SYMBOL(clk_unregister); | |
127 | ||
128 | static int __init clk_init(void) | |
129 | { | |
130 | clk_register(&kmi_clk); | |
131 | clk_register(&uart_clk); | |
132 | clk_register(&mmci_clk); | |
133 | return 0; | |
134 | } | |
135 | arch_initcall(clk_init); |