clock-debugfs.c

/*
 *  Copyright (C) 2010, Lars-Peter Clausen <[email protected]>
 *  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;
}