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
jz4740_clock_debugfs_show_enabled(void * data,uint64_t * value)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
jz4740_clock_debugfs_set_enabled(void * data,uint64_t value)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
jz4740_clock_debugfs_show_rate(void * data,uint64_t * value)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
jz4740_clock_debugfs_add_clk(struct clk * clk)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 */
jz4740_clock_debugfs_update_parent(struct clk * clk)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
jz4740_clock_debugfs_init(void)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 }
110