forked from Minki/linux
125 lines
2.2 KiB
C
125 lines
2.2 KiB
C
/*
|
|
* linux/arch/arm/mach-sa1100/clock.c
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/err.h>
|
|
#include <linux/string.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/arch/pxa-regs.h>
|
|
#include <asm/hardware.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
struct clk {
|
|
struct list_head node;
|
|
unsigned long rate;
|
|
struct module *owner;
|
|
const char *name;
|
|
unsigned int enabled;
|
|
void (*enable)(void);
|
|
void (*disable)(void);
|
|
};
|
|
|
|
static LIST_HEAD(clocks);
|
|
static DECLARE_MUTEX(clocks_sem);
|
|
static DEFINE_SPINLOCK(clocks_lock);
|
|
|
|
struct clk *clk_get(struct device *dev, const char *id)
|
|
{
|
|
struct clk *p, *clk = ERR_PTR(-ENOENT);
|
|
|
|
down(&clocks_sem);
|
|
list_for_each_entry(p, &clocks, node) {
|
|
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
|
|
clk = p;
|
|
break;
|
|
}
|
|
}
|
|
up(&clocks_sem);
|
|
|
|
return clk;
|
|
}
|
|
EXPORT_SYMBOL(clk_get);
|
|
|
|
void clk_put(struct clk *clk)
|
|
{
|
|
module_put(clk->owner);
|
|
}
|
|
EXPORT_SYMBOL(clk_put);
|
|
|
|
int clk_enable(struct clk *clk)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&clocks_lock, flags);
|
|
if (clk->enabled++ == 0)
|
|
clk->enable();
|
|
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->disable();
|
|
spin_unlock_irqrestore(&clocks_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(clk_disable);
|
|
|
|
unsigned long clk_get_rate(struct clk *clk)
|
|
{
|
|
return clk->rate;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_rate);
|
|
|
|
|
|
static void clk_gpio27_enable(void)
|
|
{
|
|
pxa_gpio_mode(GPIO11_3_6MHz_MD);
|
|
}
|
|
|
|
static void clk_gpio27_disable(void)
|
|
{
|
|
}
|
|
|
|
static struct clk clk_gpio27 = {
|
|
.name = "GPIO27_CLK",
|
|
.rate = 3686400,
|
|
.enable = clk_gpio27_enable,
|
|
.disable = clk_gpio27_disable,
|
|
};
|
|
|
|
int clk_register(struct clk *clk)
|
|
{
|
|
down(&clocks_sem);
|
|
list_add(&clk->node, &clocks);
|
|
up(&clocks_sem);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(clk_register);
|
|
|
|
void clk_unregister(struct clk *clk)
|
|
{
|
|
down(&clocks_sem);
|
|
list_del(&clk->node);
|
|
up(&clocks_sem);
|
|
}
|
|
EXPORT_SYMBOL(clk_unregister);
|
|
|
|
static int __init clk_init(void)
|
|
{
|
|
clk_register(&clk_gpio27);
|
|
return 0;
|
|
}
|
|
arch_initcall(clk_init);
|