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