clock-debugfs.c
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/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC clock support debugfs entries
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <asm/mach-jz4740/clock.h>
#include "clock.h"
static struct dentry *jz4740_clock_debugfs;
static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_is_enabled(clk);
return 0;
}
static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
{
struct clk *clk = data;
if (value)
return clk_enable(clk);
else
clk_disable(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
jz4740_clock_debugfs_show_enabled,
jz4740_clock_debugfs_set_enabled,
"%llu\n");
static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_get_rate(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
jz4740_clock_debugfs_show_rate,
NULL,
"%llu\n");
void jz4740_clock_debugfs_add_clk(struct clk *clk)
{
if (!jz4740_clock_debugfs)
return;
clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_rate);
debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_enabled);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
}
}
/* TODO: Locking */
void jz4740_clock_debugfs_update_parent(struct clk *clk)
{
if (clk->debugfs_parent_entry)
debugfs_remove(clk->debugfs_parent_entry);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
} else {
clk->debugfs_parent_entry = NULL;
}
}
void jz4740_clock_debugfs_init(void)
{
jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
if (IS_ERR(jz4740_clock_debugfs))
jz4740_clock_debugfs = NULL;
}