[ARM] pxa: add MFP support for pxa168
[linux-2.6] / arch / arm / mach-mmp / clock.c
1 /*
2  *  linux/arch/arm/mach-mmp/clock.c
3  *
4  *  This program is free software; you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License version 2 as
6  *  published by the Free Software Foundation.
7  */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/list.h>
12 #include <linux/spinlock.h>
13 #include <linux/clk.h>
14 #include <linux/io.h>
15
16 #include <mach/regs-apbc.h>
17 #include "clock.h"
18
19 static void apbc_clk_enable(struct clk *clk)
20 {
21         uint32_t clk_rst;
22
23         clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel);
24         __raw_writel(clk_rst, clk->clk_rst);
25 }
26
27 static void apbc_clk_disable(struct clk *clk)
28 {
29         __raw_writel(0, clk->clk_rst);
30 }
31
32 struct clkops apbc_clk_ops = {
33         .enable         = apbc_clk_enable,
34         .disable        = apbc_clk_disable,
35 };
36
37 static DEFINE_SPINLOCK(clocks_lock);
38
39 int clk_enable(struct clk *clk)
40 {
41         unsigned long flags;
42
43         spin_lock_irqsave(&clocks_lock, flags);
44         if (clk->enabled++ == 0)
45                 clk->ops->enable(clk);
46         spin_unlock_irqrestore(&clocks_lock, flags);
47         return 0;
48 }
49 EXPORT_SYMBOL(clk_enable);
50
51 void clk_disable(struct clk *clk)
52 {
53         unsigned long flags;
54
55         WARN_ON(clk->enabled == 0);
56
57         spin_lock_irqsave(&clocks_lock, flags);
58         if (--clk->enabled == 0)
59                 clk->ops->disable(clk);
60         spin_unlock_irqrestore(&clocks_lock, flags);
61 }
62 EXPORT_SYMBOL(clk_disable);
63
64 unsigned long clk_get_rate(struct clk *clk)
65 {
66         unsigned long rate;
67
68         if (clk->ops->getrate)
69                 rate = clk->ops->getrate(clk);
70         else
71                 rate = clk->rate;
72
73         return rate;
74 }
75 EXPORT_SYMBOL(clk_get_rate);
76
77 void clks_register(struct clk_lookup *clks, size_t num)
78 {
79         int i;
80
81         for (i = 0; i < num; i++)
82                 clkdev_add(&clks[i]);
83 }