[mirror_ubuntu-focal-kernel.git] / arch / m68k / coldfire / clk.c

// SPDX-License-Identifier: GPL-2.0
/***************************************************************************/

/*
 *	clk.c -- general ColdFire CPU kernel clk handling
 *
 *	Copyright (C) 2009, Greg Ungerer (gerg@snapgear.com)
 */

/***************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfclk.h>

static DEFINE_SPINLOCK(clk_lock);

#ifdef MCFPM_PPMCR0
/*
 *	For more advanced ColdFire parts that have clocks that can be enabled
 *	we supply enable/disable functions. These must properly define their
 *	clocks in their platform specific code.
 */
void __clk_init_enabled(struct clk *clk)
{
	clk->enabled = 1;
	clk->clk_ops->enable(clk);
}

void __clk_init_disabled(struct clk *clk)
{
	clk->enabled = 0;
	clk->clk_ops->disable(clk);
}

static void __clk_enable0(struct clk *clk)
{
	__raw_writeb(clk->slot, MCFPM_PPMCR0);
}

static void __clk_disable0(struct clk *clk)
{
	__raw_writeb(clk->slot, MCFPM_PPMSR0);
}

struct clk_ops clk_ops0 = {
	.enable		= __clk_enable0,
	.disable	= __clk_disable0,
};

#ifdef MCFPM_PPMCR1
static void __clk_enable1(struct clk *clk)
{
	__raw_writeb(clk->slot, MCFPM_PPMCR1);
}

static void __clk_disable1(struct clk *clk)
{
	__raw_writeb(clk->slot, MCFPM_PPMSR1);
}

struct clk_ops clk_ops1 = {
	.enable		= __clk_enable1,
	.disable	= __clk_disable1,
};
#endif /* MCFPM_PPMCR1 */
#endif /* MCFPM_PPMCR0 */

struct clk *clk_get(struct device *dev, const char *id)
{
	const char *clk_name = dev ? dev_name(dev) : id ? id : NULL;
	struct clk *clk;
	unsigned i;

	for (i = 0; (clk = mcf_clks[i]) != NULL; ++i)
		if (!strcmp(clk->name, clk_name))
			return clk;
	pr_warn("clk_get: didn't find clock %s\n", clk_name);
	return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);

int clk_enable(struct clk *clk)
{
	unsigned long flags;
	spin_lock_irqsave(&clk_lock, flags);
	if ((clk->enabled++ == 0) && clk->clk_ops)
		clk->clk_ops->enable(clk);
	spin_unlock_irqrestore(&clk_lock, flags);

	return 0;
}
EXPORT_SYMBOL(clk_enable);

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

	if (!clk)
		return;

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

void clk_put(struct clk *clk)
{
	if (clk->enabled != 0)
		pr_warn("clk_put %s still enabled\n", clk->name);
}
EXPORT_SYMBOL(clk_put);

unsigned long clk_get_rate(struct clk *clk)
{
	if (!clk)
		return 0;

	return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);

/* dummy functions, should not be called */
long clk_round_rate(struct clk *clk, unsigned long rate)
{
	WARN_ON(clk);
	return 0;
}
EXPORT_SYMBOL(clk_round_rate);

int clk_set_rate(struct clk *clk, unsigned long rate)
{
	WARN_ON(clk);
	return 0;
}
EXPORT_SYMBOL(clk_set_rate);

int clk_set_parent(struct clk *clk, struct clk *parent)
{
	WARN_ON(clk);
	return 0;
}
EXPORT_SYMBOL(clk_set_parent);

struct clk *clk_get_parent(struct clk *clk)
{
	WARN_ON(clk);
	return NULL;
}
EXPORT_SYMBOL(clk_get_parent);

/***************************************************************************/
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/***************************************************************************/
	3
	4	/*
	5	* clk.c -- general ColdFire CPU kernel clk handling
	6	*
	7	* Copyright (C) 2009, Greg Ungerer (gerg@snapgear.com)
	8	*/
	9
	10	/***************************************************************************/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/mutex.h>
	16	#include <linux/clk.h>
	17	#include <linux/io.h>
	18	#include <linux/err.h>
	19	#include <asm/coldfire.h>
	20	#include <asm/mcfsim.h>
	21	#include <asm/mcfclk.h>
	22
	23	static DEFINE_SPINLOCK(clk_lock);
	24
	25	#ifdef MCFPM_PPMCR0
	26	/*
	27	* For more advanced ColdFire parts that have clocks that can be enabled
	28	* we supply enable/disable functions. These must properly define their
	29	* clocks in their platform specific code.
	30	*/
	31	void __clk_init_enabled(struct clk *clk)
	32	{
	33	clk->enabled = 1;
	34	clk->clk_ops->enable(clk);
	35	}
	36
	37	void __clk_init_disabled(struct clk *clk)
	38	{
	39	clk->enabled = 0;
	40	clk->clk_ops->disable(clk);
	41	}
	42
	43	static void __clk_enable0(struct clk *clk)
	44	{
	45	__raw_writeb(clk->slot, MCFPM_PPMCR0);
	46	}
	47
	48	static void __clk_disable0(struct clk *clk)
	49	{
	50	__raw_writeb(clk->slot, MCFPM_PPMSR0);
	51	}
	52
	53	struct clk_ops clk_ops0 = {
	54	.enable = __clk_enable0,
	55	.disable = __clk_disable0,
	56	};
	57
	58	#ifdef MCFPM_PPMCR1
	59	static void __clk_enable1(struct clk *clk)
	60	{
	61	__raw_writeb(clk->slot, MCFPM_PPMCR1);
	62	}
	63
	64	static void __clk_disable1(struct clk *clk)
	65	{
	66	__raw_writeb(clk->slot, MCFPM_PPMSR1);
	67	}
	68
	69	struct clk_ops clk_ops1 = {
	70	.enable = __clk_enable1,
	71	.disable = __clk_disable1,
	72	};
	73	#endif /* MCFPM_PPMCR1 */
	74	#endif /* MCFPM_PPMCR0 */
	75
	76	struct clk clk_get(struct device dev, const char *id)
	77	{
	78	const char *clk_name = dev ? dev_name(dev) : id ? id : NULL;
	79	struct clk *clk;
	80	unsigned i;
	81
	82	for (i = 0; (clk = mcf_clks[i]) != NULL; ++i)
	83	if (!strcmp(clk->name, clk_name))
	84	return clk;
	85	pr_warn("clk_get: didn't find clock %s\n", clk_name);
	86	return ERR_PTR(-ENOENT);
	87	}
	88	EXPORT_SYMBOL(clk_get);
	89
	90	int clk_enable(struct clk *clk)
	91	{
	92	unsigned long flags;
	93	spin_lock_irqsave(&clk_lock, flags);
	94	if ((clk->enabled++ == 0) && clk->clk_ops)
	95	clk->clk_ops->enable(clk);
	96	spin_unlock_irqrestore(&clk_lock, flags);
	97
	98	return 0;
	99	}
	100	EXPORT_SYMBOL(clk_enable);
	101
	102	void clk_disable(struct clk *clk)
	103	{
	104	unsigned long flags;
	105
	106	if (!clk)
	107	return;
	108
	109	spin_lock_irqsave(&clk_lock, flags);
	110	if ((--clk->enabled == 0) && clk->clk_ops)
	111	clk->clk_ops->disable(clk);
	112	spin_unlock_irqrestore(&clk_lock, flags);
	113	}
	114	EXPORT_SYMBOL(clk_disable);
	115
	116	void clk_put(struct clk *clk)
	117	{
	118	if (clk->enabled != 0)
	119	pr_warn("clk_put %s still enabled\n", clk->name);
	120	}
	121	EXPORT_SYMBOL(clk_put);
	122
	123	unsigned long clk_get_rate(struct clk *clk)
	124	{
	125	if (!clk)
	126	return 0;
	127
	128	return clk->rate;
	129	}
	130	EXPORT_SYMBOL(clk_get_rate);
	131
	132	/* dummy functions, should not be called */
	133	long clk_round_rate(struct clk *clk, unsigned long rate)
	134	{
	135	WARN_ON(clk);
	136	return 0;
	137	}
	138	EXPORT_SYMBOL(clk_round_rate);
	139
	140	int clk_set_rate(struct clk *clk, unsigned long rate)
	141	{
	142	WARN_ON(clk);
	143	return 0;
	144	}
	145	EXPORT_SYMBOL(clk_set_rate);
	146
	147	int clk_set_parent(struct clk clk, struct clk parent)
	148	{
	149	WARN_ON(clk);
	150	return 0;
	151	}
	152	EXPORT_SYMBOL(clk_set_parent);
	153
	154	struct clk clk_get_parent(struct clk clk)
	155	{
	156	WARN_ON(clk);
	157	return NULL;
	158	}
	159	EXPORT_SYMBOL(clk_get_parent);
	160
	161	/***************************************************************************/