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1 | /* arch/arm/mach-lh7a40x/clocks.c |
2 | * | |
3 | * Copyright (C) 2004 Marc Singer | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | */ | |
a09e64fb RK |
10 | #include <mach/hardware.h> |
11 | #include <mach/clocks.h> | |
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12 | #include <linux/err.h> |
13 | ||
14 | struct module; | |
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15 | |
16 | struct clk { | |
17 | struct list_head node; | |
18 | unsigned long rate; | |
19 | struct module *owner; | |
20 | const char *name; | |
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21 | }; |
22 | ||
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23 | /* ----- */ |
24 | ||
25 | #define MAINDIV1(c) (((c) >> 7) & 0x0f) | |
26 | #define MAINDIV2(c) (((c) >> 11) & 0x1f) | |
27 | #define PS(c) (((c) >> 18) & 0x03) | |
28 | #define PREDIV(c) (((c) >> 2) & 0x1f) | |
29 | #define HCLKDIV(c) (((c) >> 0) & 0x02) | |
30 | #define PCLKDIV(c) (((c) >> 16) & 0x03) | |
31 | ||
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32 | unsigned int fclkfreq_get (void) |
33 | { | |
34 | unsigned int clkset = CSC_CLKSET; | |
35 | unsigned int gclk | |
36 | = XTAL_IN | |
37 | / (1 << PS(clkset)) | |
38 | * (MAINDIV1(clkset) + 2) | |
39 | / (PREDIV(clkset) + 2) | |
40 | * (MAINDIV2(clkset) + 2) | |
41 | ; | |
42 | return gclk; | |
43 | } | |
44 | ||
45 | unsigned int hclkfreq_get (void) | |
46 | { | |
47 | unsigned int clkset = CSC_CLKSET; | |
48 | unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1); | |
49 | ||
50 | return hclk; | |
51 | } | |
52 | ||
53 | unsigned int pclkfreq_get (void) | |
54 | { | |
55 | unsigned int clkset = CSC_CLKSET; | |
56 | int pclkdiv = PCLKDIV(clkset); | |
57 | unsigned int pclk; | |
58 | if (pclkdiv == 0x3) | |
59 | pclkdiv = 0x2; | |
60 | pclk = hclkfreq_get () / (1 << pclkdiv); | |
61 | ||
62 | return pclk; | |
63 | } | |
64 | ||
65 | /* ----- */ | |
66 | ||
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67 | struct clk *clk_get (struct device *dev, const char *id) |
68 | { | |
80a5931b RK |
69 | return dev && strcmp(dev_name(dev), "cldc-lh7a40x") == 0 |
70 | ? NULL : ERR_PTR(-ENOENT); | |
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71 | } |
72 | EXPORT_SYMBOL(clk_get); | |
73 | ||
74 | void clk_put (struct clk *clk) | |
75 | { | |
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76 | } |
77 | EXPORT_SYMBOL(clk_put); | |
78 | ||
79 | int clk_enable (struct clk *clk) | |
80 | { | |
81 | return 0; | |
82 | } | |
83 | EXPORT_SYMBOL(clk_enable); | |
84 | ||
85 | void clk_disable (struct clk *clk) | |
86 | { | |
87 | } | |
88 | EXPORT_SYMBOL(clk_disable); | |
89 | ||
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90 | unsigned long clk_get_rate (struct clk *clk) |
91 | { | |
80a5931b | 92 | return 0; |
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93 | } |
94 | EXPORT_SYMBOL(clk_get_rate); | |
95 | ||
96 | long clk_round_rate (struct clk *clk, unsigned long rate) | |
97 | { | |
98 | return rate; | |
99 | } | |
100 | EXPORT_SYMBOL(clk_round_rate); | |
101 | ||
102 | int clk_set_rate (struct clk *clk, unsigned long rate) | |
103 | { | |
80a5931b | 104 | return -EIO; |
638b2666 MS |
105 | } |
106 | EXPORT_SYMBOL(clk_set_rate); |