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