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