MIPS: JZ4740: Add clock API support.
[sfrench/cifs-2.6.git] / arch / mips / jz4740 / clock-debugfs.c
1 /*
2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3  *  JZ4740 SoC clock support debugfs entries
4  *
5  *  This program is free software; you can redistribute it and/or modify it
6  *  under  the terms of the GNU General  Public License as published by the
7  *  Free Software Foundation;  either version 2 of the License, or (at your
8  *  option) any later version.
9  *
10  *  You should have received a copy of the GNU General Public License along
11  *  with this program; if not, write to the Free Software Foundation, Inc.,
12  *  675 Mass Ave, Cambridge, MA 02139, USA.
13  *
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/clk.h>
19 #include <linux/err.h>
20
21 #include <linux/debugfs.h>
22 #include <linux/uaccess.h>
23
24 #include <asm/mach-jz4740/clock.h>
25 #include "clock.h"
26
27 static struct dentry *jz4740_clock_debugfs;
28
29 static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
30 {
31         struct clk *clk = data;
32         *value = clk_is_enabled(clk);
33
34         return 0;
35 }
36
37 static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
38 {
39         struct clk *clk = data;
40
41         if (value)
42                 return clk_enable(clk);
43         else
44                 clk_disable(clk);
45
46         return 0;
47 }
48
49 DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
50         jz4740_clock_debugfs_show_enabled,
51         jz4740_clock_debugfs_set_enabled,
52         "%llu\n");
53
54 static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
55 {
56         struct clk *clk = data;
57         *value = clk_get_rate(clk);
58
59         return 0;
60 }
61
62 DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
63         jz4740_clock_debugfs_show_rate,
64         NULL,
65         "%llu\n");
66
67 void jz4740_clock_debugfs_add_clk(struct clk *clk)
68 {
69         if (!jz4740_clock_debugfs)
70                 return;
71
72         clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
73         debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
74                                 &jz4740_clock_debugfs_ops_rate);
75         debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
76                                 &jz4740_clock_debugfs_ops_enabled);
77
78         if (clk->parent) {
79                 char parent_path[100];
80                 snprintf(parent_path, 100, "../%s", clk->parent->name);
81                 clk->debugfs_parent_entry = debugfs_create_symlink("parent",
82                                                 clk->debugfs_entry,
83                                                 parent_path);
84         }
85 }
86
87 /* TODO: Locking */
88 void jz4740_clock_debugfs_update_parent(struct clk *clk)
89 {
90         if (clk->debugfs_parent_entry)
91                 debugfs_remove(clk->debugfs_parent_entry);
92
93         if (clk->parent) {
94                 char parent_path[100];
95                 snprintf(parent_path, 100, "../%s", clk->parent->name);
96                 clk->debugfs_parent_entry = debugfs_create_symlink("parent",
97                                                 clk->debugfs_entry,
98                                                 parent_path);
99         } else {
100                 clk->debugfs_parent_entry = NULL;
101         }
102 }
103
104 void jz4740_clock_debugfs_init(void)
105 {
106         jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
107         if (IS_ERR(jz4740_clock_debugfs))
108                 jz4740_clock_debugfs = NULL;
109 }