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[ARM] sa1100: match clock by dev_name(dev)

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Continuing the move away from implementations which give an excuse
for other bad implementations, convert SA1100 to lookup its singular
clock by dev_name(dev) rather than by id.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2008-11-08 20:48:27 +00:00 committed by Russell King
parent e0d8b13ae1
commit 5e1dbdb458
1 changed files with 41 additions and 87 deletions
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128
arch/arm/mach-sa1100/clock.c
View file

@ -3,6 +3,7 @@
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
@ -14,76 +15,12 @@
#include <mach/hardware.h>
/*
* Very simple clock implementation - we only have one clock to
* deal with at the moment, so we only match using the "name".
* Very simple clock implementation - we only have one clock to deal with.
*/
struct clk {
struct list_head node;
unsigned long rate;
const char *name;
unsigned int enabled;
void (*enable)(void);
void (*disable)(void);
};
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
static DEFINE_SPINLOCK(clocks_lock);
struct clk *clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);
mutex_lock(&clocks_mutex);
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0) {
clk = p;
break;
}
}
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->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)
{
/*
@ -102,33 +39,50 @@ static void clk_gpio27_disable(void)
GAFR &= ~GPIO_32_768kHz;
}
static struct clk clk_gpio27 = {
.name = "SA1111_CLK",
.rate = 3686400,
.enable = clk_gpio27_enable,
.disable = clk_gpio27_disable,
};
static struct clk clk_gpio27;
int clk_register(struct clk *clk)
static DEFINE_SPINLOCK(clocks_lock);
struct clk *clk_get(struct device *dev, const char *id)
{
mutex_lock(&clocks_mutex);
list_add(&clk->node, &clocks);
mutex_unlock(&clocks_mutex);
const char *devname = dev_name(dev);
return strcmp(devname, "sa1111.0") ? ERR_PTR(-ENOENT) : &clk_gpio27;
}
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_gpio27_enable();
spin_unlock_irqrestore(&clocks_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_register);
EXPORT_SYMBOL(clk_enable);
void clk_unregister(struct clk *clk)
void clk_disable(struct clk *clk)
{
mutex_lock(&clocks_mutex);
list_del(&clk->node);
mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clk_unregister);
unsigned long flags;
static int __init clk_init(void)
{
clk_register(&clk_gpio27);
return 0;
WARN_ON(clk->enabled == 0);
spin_lock_irqsave(&clocks_lock, flags);
if (--clk->enabled == 0)
clk_gpio27_disable();
spin_unlock_irqrestore(&clocks_lock, flags);
}
arch_initcall(clk_init);
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
return 3686400;
}
EXPORT_SYMBOL(clk_get_rate);