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 | |
28 | static DEFINE_SPINLOCK(clocks_lock); |
29 | |
30 | int clk_enable(struct clk *clk) |
31 | { |
32 | unsigned long flags; |
33 | |
34 | spin_lock_irqsave(&clocks_lock, flags); |
35 | if (clk->enabled++ == 0) |
36 | (clk->enable)(clk, 1); |
37 | spin_unlock_irqrestore(&clocks_lock, flags); |
38 | |
39 | return 0; |
40 | } |
41 | EXPORT_SYMBOL(clk_enable); |
42 | |
43 | void clk_disable(struct clk *clk) |
44 | { |
45 | unsigned long flags; |
46 | |
47 | WARN_ON(clk->enabled == 0); |
48 | |
49 | spin_lock_irqsave(&clocks_lock, flags); |
50 | if (--clk->enabled == 0) |
51 | (clk->enable)(clk, 0); |
52 | spin_unlock_irqrestore(&clocks_lock, flags); |
53 | } |
54 | EXPORT_SYMBOL(clk_disable); |
55 | |
56 | void w90x900_clk_enable(struct clk *clk, int enable) |
57 | { |
58 | unsigned int clocks = clk->cken; |
59 | unsigned long clken; |
60 | |
61 | clken = __raw_readl(W90X900_VA_CLKPWR); |
62 | |
63 | if (enable) |
64 | clken |= clocks; |
65 | else |
66 | clken &= ~clocks; |
67 | |
68 | __raw_writel(clken, W90X900_VA_CLKPWR); |
69 | } |
70 | |
71 | void clks_register(struct clk_lookup *clks, size_t num) |
72 | { |
73 | int i; |
74 | |
75 | for (i = 0; i < num; i++) |
76 | clkdev_add(&clks[i]); |
77 | } |