0e4a34bb |
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 | |
db58e90f |
28 | #define SUBCLK 0x24 |
29 | |
0e4a34bb |
30 | static DEFINE_SPINLOCK(clocks_lock); |
31 | |
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 | |
45 | void clk_disable(struct clk *clk) |
46 | { |
47 | unsigned long flags; |
48 | |
49 | WARN_ON(clk->enabled == 0); |
50 | |
51 | spin_lock_irqsave(&clocks_lock, flags); |
52 | if (--clk->enabled == 0) |
53 | (clk->enable)(clk, 0); |
54 | spin_unlock_irqrestore(&clocks_lock, flags); |
55 | } |
56 | EXPORT_SYMBOL(clk_disable); |
57 | |
58b5369e |
58 | unsigned long clk_get_rate(struct clk *clk) |
59 | { |
60 | return 15000000; |
61 | } |
62 | EXPORT_SYMBOL(clk_get_rate); |
63 | |
35c9221a |
64 | void nuc900_clk_enable(struct clk *clk, int enable) |
0e4a34bb |
65 | { |
66 | unsigned int clocks = clk->cken; |
67 | unsigned long clken; |
68 | |
69 | clken = __raw_readl(W90X900_VA_CLKPWR); |
70 | |
71 | if (enable) |
72 | clken |= clocks; |
73 | else |
74 | clken &= ~clocks; |
75 | |
76 | __raw_writel(clken, W90X900_VA_CLKPWR); |
77 | } |
78 | |
35c9221a |
79 | void nuc900_subclk_enable(struct clk *clk, int enable) |
db58e90f |
80 | { |
81 | unsigned int clocks = clk->cken; |
82 | unsigned long clken; |
83 | |
84 | clken = __raw_readl(W90X900_VA_CLKPWR + SUBCLK); |
85 | |
86 | if (enable) |
87 | clken |= clocks; |
88 | else |
89 | clken &= ~clocks; |
90 | |
91 | __raw_writel(clken, W90X900_VA_CLKPWR + SUBCLK); |
92 | } |