6b13f685e
 김민수
BSP 최초 추가
|
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
|
/*
* linux/arch/arm/mach-mmp/clock.c
*
* 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/spinlock.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/regs-apbc.h>
#include "clock.h"
static void apbc_clk_enable(struct clk *clk)
{
uint32_t clk_rst;
clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel);
__raw_writel(clk_rst, clk->clk_rst);
}
static void apbc_clk_disable(struct clk *clk)
{
__raw_writel(0, clk->clk_rst);
}
struct clkops apbc_clk_ops = {
.enable = apbc_clk_enable,
.disable = apbc_clk_disable,
};
static void apmu_clk_enable(struct clk *clk)
{
__raw_writel(clk->enable_val, clk->clk_rst);
}
static void apmu_clk_disable(struct clk *clk)
{
__raw_writel(0, clk->clk_rst);
}
struct clkops apmu_clk_ops = {
.enable = apmu_clk_enable,
.disable = apmu_clk_disable,
};
static DEFINE_SPINLOCK(clocks_lock);
int clk_enable(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clocks_lock, flags);
if (clk->enabled++ == 0)
clk->ops->enable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
unsigned long flags;
WARN_ON(clk->enabled == 0);
spin_lock_irqsave(&clocks_lock, flags);
if (--clk->enabled == 0)
clk->ops->disable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long rate;
if (clk->ops->getrate)
rate = clk->ops->getrate(clk);
else
rate = clk->rate;
return rate;
}
EXPORT_SYMBOL(clk_get_rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
int ret = -EINVAL;
if (clk->ops->setrate) {
spin_lock_irqsave(&clocks_lock, flags);
ret = clk->ops->setrate(clk, rate);
spin_unlock_irqrestore(&clocks_lock, flags);
}
return ret;
}
EXPORT_SYMBOL(clk_set_rate);
|