[mirror_ubuntu-artful-kernel.git] / arch / arm / mach-mmp / clock.c

/*
 *  linux/arch/arm/mach-mmp/clock.c
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <mach/regs-apbc.h>
#include "clock.h"

static void apbc_clk_enable(struct clk *clk)
{
	uint32_t clk_rst;

	clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel);
	__raw_writel(clk_rst, clk->clk_rst);
}

static void apbc_clk_disable(struct clk *clk)
{
	__raw_writel(0, clk->clk_rst);
}

struct clkops apbc_clk_ops = {
	.enable		= apbc_clk_enable,
	.disable	= apbc_clk_disable,
};

static DEFINE_SPINLOCK(clocks_lock);

int clk_enable(struct clk *clk)
{
	unsigned long flags;

	spin_lock_irqsave(&clocks_lock, flags);
	if (clk->enabled++ == 0)
		clk->ops->enable(clk);
	spin_unlock_irqrestore(&clocks_lock, flags);
	return 0;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
	unsigned long flags;

	WARN_ON(clk->enabled == 0);

	spin_lock_irqsave(&clocks_lock, flags);
	if (--clk->enabled == 0)
		clk->ops->disable(clk);
	spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
	unsigned long rate;

	if (clk->ops->getrate)
		rate = clk->ops->getrate(clk);
	else
		rate = clk->rate;

	return rate;
}
EXPORT_SYMBOL(clk_get_rate);

void clks_register(struct clk_lookup *clks, size_t num)
{
	int i;

	for (i = 0; i < num; i++)
		clkdev_add(&clks[i]);
}
Commit	Line	Data
49cbe786 EM	1	/*
	2	* linux/arch/arm/mach-mmp/clock.c
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/kernel.h>
	11	#include <linux/list.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/clk.h>
	14	#include <linux/io.h>
	15
	16	#include <mach/regs-apbc.h>
	17	#include "clock.h"
	18
	19	static void apbc_clk_enable(struct clk *clk)
	20	{
	21	uint32_t clk_rst;
	22
	23	clk_rst = APBC_APBCLK \| APBC_FNCLK \| APBC_FNCLKSEL(clk->fnclksel);
	24	__raw_writel(clk_rst, clk->clk_rst);
	25	}
	26
	27	static void apbc_clk_disable(struct clk *clk)
	28	{
	29	__raw_writel(0, clk->clk_rst);
	30	}
	31
	32	struct clkops apbc_clk_ops = {
	33	.enable = apbc_clk_enable,
	34	.disable = apbc_clk_disable,
	35	};
	36
	37	static DEFINE_SPINLOCK(clocks_lock);
	38
	39	int clk_enable(struct clk *clk)
	40	{
	41	unsigned long flags;
	42
	43	spin_lock_irqsave(&clocks_lock, flags);
	44	if (clk->enabled++ == 0)
	45	clk->ops->enable(clk);
	46	spin_unlock_irqrestore(&clocks_lock, flags);
	47	return 0;
	48	}
	49	EXPORT_SYMBOL(clk_enable);
	50
	51	void clk_disable(struct clk *clk)
	52	{
	53	unsigned long flags;
	54
	55	WARN_ON(clk->enabled == 0);
	56
	57	spin_lock_irqsave(&clocks_lock, flags);
	58	if (--clk->enabled == 0)
	59	clk->ops->disable(clk);
	60	spin_unlock_irqrestore(&clocks_lock, flags);
	61	}
	62	EXPORT_SYMBOL(clk_disable);
	63
	64	unsigned long clk_get_rate(struct clk *clk)
65	{
66	unsigned long rate;
67
68	if (clk->ops->getrate)
69	rate = clk->ops->getrate(clk);
70	else
71	rate = clk->rate;
72
73	return rate;
74	}
75	EXPORT_SYMBOL(clk_get_rate);
76
77	void clks_register(struct clk_lookup *clks, size_t num)
78	{
79	int i;
80
81	for (i = 0; i < num; i++)
82	clkdev_add(&clks[i]);
83	}