clock-debugfs.c

Go to the documentation of this file.

/*
 *  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;
}