[ARM] realview: convert to clkdev and lookup clocks by device name
[linux-2.6.git] / arch / arm / mach-realview / clock.c
1 /*
2  *  linux/arch/arm/mach-realview/clock.c
3  *
4  *  Copyright (C) 2004 ARM Limited.
5  *  Written by Deep Blue Solutions Limited.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/device.h>
14 #include <linux/list.h>
15 #include <linux/errno.h>
16 #include <linux/err.h>
17 #include <linux/string.h>
18 #include <linux/clk.h>
19 #include <linux/mutex.h>
20
21 #include <asm/hardware/icst307.h>
22
23 #include "clock.h"
24
25 int clk_enable(struct clk *clk)
26 {
27         return 0;
28 }
29 EXPORT_SYMBOL(clk_enable);
30
31 void clk_disable(struct clk *clk)
32 {
33 }
34 EXPORT_SYMBOL(clk_disable);
35
36 unsigned long clk_get_rate(struct clk *clk)
37 {
38         return clk->rate;
39 }
40 EXPORT_SYMBOL(clk_get_rate);
41
42 long clk_round_rate(struct clk *clk, unsigned long rate)
43 {
44         struct icst307_vco vco;
45         vco = icst307_khz_to_vco(clk->params, rate / 1000);
46         return icst307_khz(clk->params, vco) * 1000;
47 }
48 EXPORT_SYMBOL(clk_round_rate);
49
50 int clk_set_rate(struct clk *clk, unsigned long rate)
51 {
52         int ret = -EIO;
53
54         if (clk->setvco) {
55                 struct icst307_vco vco;
56
57                 vco = icst307_khz_to_vco(clk->params, rate / 1000);
58                 clk->rate = icst307_khz(clk->params, vco) * 1000;
59                 clk->setvco(clk, vco);
60                 ret = 0;
61         }
62         return ret;
63 }
64 EXPORT_SYMBOL(clk_set_rate);