mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 10:14:23 +08:00
742859adc7
In many of clk_disable() implementations, it is a no-op for a NULL pointer input, but this is one of the exceptions. Making it treewide consistent will allow clock consumers to call clk_disable() without NULL pointer check. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
/***************************************************************************/
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
return clk->rate;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_rate);
|
|
|
|
/***************************************************************************/
|