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 <linux/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 */
clk_get_rate(struct clk * clk)17 unsigned long clk_get_rate(struct clk *clk)
18 {
19 return clk->rate;
20 }
21 EXPORT_SYMBOL(clk_get_rate);
22
23 /* enable and disable do nothing */
clk_enable(struct clk * clk)24 int clk_enable(struct clk *clk)
25 {
26 return 0;
27 }
28 EXPORT_SYMBOL(clk_enable);
29
clk_disable(struct clk * clk)30 void clk_disable(struct clk *clk)
31 {
32 }
33 EXPORT_SYMBOL(clk_disable);
34
35 static struct clk clk_24 = {
36 .rate = 2400000,
37 };
38
39 static 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 */
47 static struct clk clk_default;
48
49 #define CLK(_clk, dev) \
50 { \
51 .clk = _clk, \
52 .dev_id = dev, \
53 }
54
55 static 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
clk_init(void)71 int __init clk_init(void)
72 {
73 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
74 return 0;
75 }
76