mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
aa9daa310d
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: Arnd Bergmann <arnd@arndb.de>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
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 "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 void apmu_clk_enable(struct clk *clk)
|
|
{
|
|
__raw_writel(clk->enable_val, clk->clk_rst);
|
|
}
|
|
|
|
static void apmu_clk_disable(struct clk *clk)
|
|
{
|
|
__raw_writel(0, clk->clk_rst);
|
|
}
|
|
|
|
struct clkops apmu_clk_ops = {
|
|
.enable = apmu_clk_enable,
|
|
.disable = apmu_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;
|
|
|
|
if (!clk)
|
|
return;
|
|
|
|
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);
|
|
|
|
int clk_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
unsigned long flags;
|
|
int ret = -EINVAL;
|
|
|
|
if (clk->ops->setrate) {
|
|
spin_lock_irqsave(&clocks_lock, flags);
|
|
ret = clk->ops->setrate(clk, rate);
|
|
spin_unlock_irqrestore(&clocks_lock, flags);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(clk_set_rate);
|