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