Root/arch/arm/mach-nomadik/clock.c

1/*
2 * linux/arch/arm/mach-nomadik/clock.c
3 *
4 * Copyright (C) 2009 Alessandro Rubini
5 */
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/errno.h>
9#include <linux/clk.h>
10#include <asm/clkdev.h>
11#include "clock.h"
12
13/*
14 * The nomadik board uses generic clocks, but the serial pl011 file
15 * calls clk_enable(), clk_disable(), clk_get_rate(), so we provide them
16 */
17unsigned long clk_get_rate(struct clk *clk)
18{
19    return clk->rate;
20}
21EXPORT_SYMBOL(clk_get_rate);
22
23/* enable and disable do nothing */
24int clk_enable(struct clk *clk)
25{
26    return 0;
27}
28EXPORT_SYMBOL(clk_enable);
29
30void clk_disable(struct clk *clk)
31{
32}
33EXPORT_SYMBOL(clk_disable);
34
35static struct clk clk_24 = {
36    .rate = 2400000,
37};
38
39static struct clk clk_48 = {
40    .rate = 48 * 1000 * 1000,
41};
42
43/*
44 * Catch-all default clock to satisfy drivers using the clk API. We don't
45 * model the actual hardware clocks yet.
46 */
47static struct clk clk_default;
48
49#define CLK(_clk, dev) \
50    { \
51        .clk = _clk, \
52        .dev_id = dev, \
53    }
54
55static struct clk_lookup lookups[] = {
56    {
57        .con_id = "apb_pclk",
58        .clk = &clk_default,
59    },
60    CLK(&clk_24, "mtu0"),
61    CLK(&clk_24, "mtu1"),
62    CLK(&clk_48, "uart0"),
63    CLK(&clk_48, "uart1"),
64    CLK(&clk_default, "gpio.0"),
65    CLK(&clk_default, "gpio.1"),
66    CLK(&clk_default, "gpio.2"),
67    CLK(&clk_default, "gpio.3"),
68    CLK(&clk_default, "rng"),
69};
70
71int __init clk_init(void)
72{
73    clkdev_add_table(lookups, ARRAY_SIZE(lookups));
74    return 0;
75}
76

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