1 /*
2 * linux/arch/arm/mach-w90x900/clock.c
3 *
4 * Copyright (c) 2008 Nuvoton technology corporation
5 *
6 * Wan ZongShun <mcuos.com@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License.
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/string.h>
19 #include <linux/clk.h>
20 #include <linux/spinlock.h>
21 #include <linux/platform_device.h>
22 #include <linux/io.h>
23
24 #include <mach/hardware.h>
25
26 #include "clock.h"
27
28 #define SUBCLK 0x24
29
30 static DEFINE_SPINLOCK(clocks_lock);
31
clk_enable(struct clk * clk)32 int clk_enable(struct clk *clk)
33 {
34 unsigned long flags;
35
36 spin_lock_irqsave(&clocks_lock, flags);
37 if (clk->enabled++ == 0)
38 (clk->enable)(clk, 1);
39 spin_unlock_irqrestore(&clocks_lock, flags);
40
41 return 0;
42 }
43 EXPORT_SYMBOL(clk_enable);
44
clk_disable(struct clk * clk)45 void clk_disable(struct clk *clk)
46 {
47 unsigned long flags;
48
49 if (!clk)
50 return;
51
52 WARN_ON(clk->enabled == 0);
53
54 spin_lock_irqsave(&clocks_lock, flags);
55 if (--clk->enabled == 0)
56 (clk->enable)(clk, 0);
57 spin_unlock_irqrestore(&clocks_lock, flags);
58 }
59 EXPORT_SYMBOL(clk_disable);
60
clk_get_rate(struct clk * clk)61 unsigned long clk_get_rate(struct clk *clk)
62 {
63 return 15000000;
64 }
65 EXPORT_SYMBOL(clk_get_rate);
66
nuc900_clk_enable(struct clk * clk,int enable)67 void nuc900_clk_enable(struct clk *clk, int enable)
68 {
69 unsigned int clocks = clk->cken;
70 unsigned long clken;
71
72 clken = __raw_readl(W90X900_VA_CLKPWR);
73
74 if (enable)
75 clken |= clocks;
76 else
77 clken &= ~clocks;
78
79 __raw_writel(clken, W90X900_VA_CLKPWR);
80 }
81
nuc900_subclk_enable(struct clk * clk,int enable)82 void nuc900_subclk_enable(struct clk *clk, int enable)
83 {
84 unsigned int clocks = clk->cken;
85 unsigned long clken;
86
87 clken = __raw_readl(W90X900_VA_CLKPWR + SUBCLK);
88
89 if (enable)
90 clken |= clocks;
91 else
92 clken &= ~clocks;
93
94 __raw_writel(clken, W90X900_VA_CLKPWR + SUBCLK);
95 }
96
97 /* dummy functions, should not be called */
clk_round_rate(struct clk * clk,unsigned long rate)98 long clk_round_rate(struct clk *clk, unsigned long rate)
99 {
100 WARN_ON(clk);
101 return 0;
102 }
103 EXPORT_SYMBOL(clk_round_rate);
104
clk_set_rate(struct clk * clk,unsigned long rate)105 int clk_set_rate(struct clk *clk, unsigned long rate)
106 {
107 WARN_ON(clk);
108 return 0;
109 }
110 EXPORT_SYMBOL(clk_set_rate);
111
clk_set_parent(struct clk * clk,struct clk * parent)112 int clk_set_parent(struct clk *clk, struct clk *parent)
113 {
114 WARN_ON(clk);
115 return 0;
116 }
117 EXPORT_SYMBOL(clk_set_parent);
118
clk_get_parent(struct clk * clk)119 struct clk *clk_get_parent(struct clk *clk)
120 {
121 WARN_ON(clk);
122 return NULL;
123 }
124 EXPORT_SYMBOL(clk_get_parent);
125
