155 lines
2.7 KiB
C
155 lines
2.7 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 <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/arch/pxa-regs.h>
|
|
#include <asm/arch/pxa2xx-gpio.h>
|
|
#include <asm/hardware.h>
|
|
|
|
#include "devices.h"
|
|
#include "generic.h"
|
|
#include "clock.h"
|
|
|
|
static LIST_HEAD(clocks);
|
|
static DEFINE_MUTEX(clocks_mutex);
|
|
static DEFINE_SPINLOCK(clocks_lock);
|
|
|
|
static struct clk *clk_lookup(struct device *dev, const char *id)
|
|
{
|
|
struct clk *p;
|
|
|
|
list_for_each_entry(p, &clocks, node)
|
|
if (strcmp(id, p->name) == 0 && p->dev == dev)
|
|
return p;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct clk *clk_get(struct device *dev, const char *id)
|
|
{
|
|
struct clk *p, *clk = ERR_PTR(-ENOENT);
|
|
|
|
mutex_lock(&clocks_mutex);
|
|
p = clk_lookup(dev, id);
|
|
if (!p)
|
|
p = clk_lookup(NULL, id);
|
|
if (p)
|
|
clk = p;
|
|
mutex_unlock(&clocks_mutex);
|
|
|
|
return clk;
|
|
}
|
|
EXPORT_SYMBOL(clk_get);
|
|
|
|
void clk_put(struct clk *clk)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(clk_put);
|
|
|
|
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);
|
|
|
|
if (clk->delay)
|
|
udelay(clk->delay);
|
|
|
|
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->ops->disable(clk);
|
|
spin_unlock_irqrestore(&clocks_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(clk_disable);
|
|
|
|
unsigned long clk_get_rate(struct clk *clk)
|
|
{
|
|
unsigned long rate;
|
|
|
|
rate = clk->rate;
|
|
if (clk->ops->getrate)
|
|
rate = clk->ops->getrate(clk);
|
|
|
|
return rate;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_rate);
|
|
|
|
|
|
static void clk_gpio27_enable(struct clk *clk)
|
|
{
|
|
pxa_gpio_mode(GPIO11_3_6MHz_MD);
|
|
}
|
|
|
|
static void clk_gpio27_disable(struct clk *clk)
|
|
{
|
|
}
|
|
|
|
static const struct clkops clk_gpio27_ops = {
|
|
.enable = clk_gpio27_enable,
|
|
.disable = clk_gpio27_disable,
|
|
};
|
|
|
|
|
|
void clk_cken_enable(struct clk *clk)
|
|
{
|
|
CKEN |= 1 << clk->cken;
|
|
}
|
|
|
|
void clk_cken_disable(struct clk *clk)
|
|
{
|
|
CKEN &= ~(1 << clk->cken);
|
|
}
|
|
|
|
const struct clkops clk_cken_ops = {
|
|
.enable = clk_cken_enable,
|
|
.disable = clk_cken_disable,
|
|
};
|
|
|
|
static struct clk common_clks[] = {
|
|
{
|
|
.name = "GPIO27_CLK",
|
|
.ops = &clk_gpio27_ops,
|
|
.rate = 3686400,
|
|
},
|
|
};
|
|
|
|
void clks_register(struct clk *clks, size_t num)
|
|
{
|
|
int i;
|
|
|
|
mutex_lock(&clocks_mutex);
|
|
for (i = 0; i < num; i++)
|
|
list_add(&clks[i].node, &clocks);
|
|
mutex_unlock(&clocks_mutex);
|
|
}
|
|
|
|
static int __init clk_init(void)
|
|
{
|
|
clks_register(common_clks, ARRAY_SIZE(common_clks));
|
|
return 0;
|
|
}
|
|
arch_initcall(clk_init);
|