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ARM: sa1100: clean up of the clock support

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Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Jett.Zhou 2011-11-30 14:32:36 +08:00 committed by Arnd Bergmann
parent 7557c175f6
commit edf3ff5bac
2 changed files with 67 additions and 26 deletions
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2
arch/arm/Kconfig
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@ -738,7 +738,7 @@ config ARCH_SA1100
select ARCH_HAS_CPUFREQ
select CPU_FREQ
select GENERIC_CLOCKEVENTS
select HAVE_CLK
select CLKDEV_LOOKUP
select HAVE_SCHED_CLOCK
select TICK_ONESHOT
select ARCH_REQUIRE_GPIOLIB

91
arch/arm/mach-sa1100/clock.c
View File

@ -11,17 +11,39 @@
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <mach/hardware.h>
/*
* Very simple clock implementation - we only have one clock to deal with.
*/
struct clkops {
void (*enable)(struct clk *);
void (*disable)(struct clk *);
unsigned long (*getrate)(struct clk *);
};
struct clk {
const struct clkops *ops;
unsigned long rate;
unsigned int enabled;
};
static void clk_gpio27_enable(void)
#define INIT_CLKREG(_clk, _devname, _conname) \
{ \
.clk = _clk, \
.dev_id = _devname, \
.con_id = _conname, \
}
#define DEFINE_CLK(_name, _ops, _rate) \
struct clk clk_##_name = { \
.ops = _ops, \
.rate = _rate, \
}
static DEFINE_SPINLOCK(clocks_lock);
static void clk_gpio27_enable(struct clk *clk)
{
/*
* First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111:
@ -32,38 +54,22 @@ static void clk_gpio27_enable(void)
TUCR = TUCR_3_6864MHz;
}
static void clk_gpio27_disable(void)
static void clk_gpio27_disable(struct clk *clk)
{
TUCR = 0;
GPDR &= ~GPIO_32_768kHz;
GAFR &= ~GPIO_32_768kHz;
}
static struct clk clk_gpio27;
static DEFINE_SPINLOCK(clocks_lock);
struct clk *clk_get(struct device *dev, const char *id)
{
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();
clk->ops->enable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_enable);
@ -76,13 +82,48 @@ void clk_disable(struct clk *clk)
spin_lock_irqsave(&clocks_lock, flags);
if (--clk->enabled == 0)
clk_gpio27_disable();
clk->ops->disable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
return 3686400;
unsigned long rate;
rate = clk->rate;
if (clk->ops->getrate)
rate = clk->ops->getrate(clk);
return rate;
}
EXPORT_SYMBOL(clk_get_rate);
const struct clkops clk_gpio27_ops = {
.enable = clk_gpio27_enable,
.disable = clk_gpio27_disable,
};
static void clk_dummy_enable(struct clk *clk) { }
static void clk_dummy_disable(struct clk *clk) { }
const struct clkops clk_dummy_ops = {
.enable = clk_dummy_enable,
.disable = clk_dummy_disable,
};
static DEFINE_CLK(gpio27, &clk_gpio27_ops, 3686400);
static DEFINE_CLK(dummy, &clk_dummy_ops, 0);
static struct clk_lookup sa11xx_clkregs[] = {
INIT_CLKREG(&clk_gpio27, "sa1111.0", NULL),
INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
};
static int __init sa11xx_clk_init(void)
{
clkdev_add_table(sa11xx_clkregs, ARRAY_SIZE(sa11xx_clkregs));
return 0;
}
postcore_initcall(sa11xx_clk_init);