Root/arch/mips/jz4740/clock-debugfs.c

Source at commit 694c7fbe86b8a9c91392e505afcb9fcfc91deccc created 12 years 6 months ago.
By Maarten ter Huurne, MIPS: JZ4740: Add cpufreq support
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
27static struct dentry *jz4740_clock_debugfs;
28
29static 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
37static 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
49DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
50    jz4740_clock_debugfs_show_enabled,
51    jz4740_clock_debugfs_set_enabled,
52    "%llu\n");
53
54static 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
62DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
63    jz4740_clock_debugfs_show_rate,
64    NULL,
65    "%llu\n");
66
67void 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 */
88void 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
104void 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}
110

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