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authorwanzongshun <mcuos.com@gmail.com>2009-06-10 10:50:44 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-06-11 09:45:18 -0400
commit0e4a34bb6565346a8d7cc56cab412a1f98d5b1cd (patch)
treed0a7ec7e72bde2b9b9a4650fe311d5f22163ee26 /arch/arm/mach-w90x900/clock.c
parentc52d3d688b09c50de12cb2fbdfebb18b3b664b00 (diff)
[ARM] 5549/1: Add clock api for w90p910 platform.
Add clock api for w90p910 platform. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-w90x900/clock.c')
-rw-r--r--arch/arm/mach-w90x900/clock.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm/mach-w90x900/clock.c b/arch/arm/mach-w90x900/clock.c
new file mode 100644
index 000000000000..f420613cd395
--- /dev/null
+++ b/arch/arm/mach-w90x900/clock.c
@@ -0,0 +1,77 @@
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
28static DEFINE_SPINLOCK(clocks_lock);
29
30int 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}
41EXPORT_SYMBOL(clk_enable);
42
43void 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}
54EXPORT_SYMBOL(clk_disable);
55
56void 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
71void 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}