// 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 */
int clk_enable(struct clk *clk)
{
unsigned long flags;
if (!clk)
return 0 ;
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);
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);
/***************************************************************************/
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¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-29)
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