MIPS: JZ4740: Add clock API support.

/*

 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>

 *

 *  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.

 *

 */

#ifndef __ASM_JZ4740_CLOCK_H__

#define __ASM_JZ4740_CLOCK_H__

enum jz4740_wait_mode {

	JZ4740_WAIT_MODE_IDLE,

	JZ4740_WAIT_MODE_SLEEP,

};

void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode);

void jz4740_clock_udc_enable_auto_suspend(void);

void jz4740_clock_udc_disable_auto_suspend(void);

#endif

/*

 *  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;

}