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ARM: sa1100: clean up clock support 

Add rtc clock support and clean clock support for gpio.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
hifive-unleashed-5.1
Jett.Zhou 2011-11-30 14:32:36 +08:00 committed by Haojian Zhuang
parent 3888c09074
commit 4a8f83409d
2 changed files with 48 additions and 36 deletions
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2
arch/arm/Kconfig
View File

@ -754,7 +754,7 @@ 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

82
arch/arm/mach-sa1100/clock.c
View File

@ -11,17 +11,29 @@
#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 *);
};
struct clk {
const struct clkops *ops;
unsigned int enabled;
};
static void clk_gpio27_enable(void)
#define DEFINE_CLK(_name, _ops) \
struct clk clk_##_name = { \
.ops = _ops, \
}
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 +44,24 @@ 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();
spin_unlock_irqrestore(&clocks_lock, flags);
if (clk) {
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);
@ -72,17 +70,31 @@ 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_gpio27_disable();
spin_unlock_irqrestore(&clocks_lock, flags);
if (clk) {
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)
const struct clkops clk_gpio27_ops = {
.enable = clk_gpio27_enable,
.disable = clk_gpio27_disable,
};
static DEFINE_CLK(gpio27, &clk_gpio27_ops);
static struct clk_lookup sa11xx_clkregs[] = {
CLKDEV_INIT("sa1111.0", NULL, &clk_gpio27),
CLKDEV_INIT("sa1100-rtc", NULL, NULL),
};
static int __init sa11xx_clk_init(void)
{
return 3686400;
clkdev_add_table(sa11xx_clkregs, ARRAY_SIZE(sa11xx_clkregs));
return 0;
}
EXPORT_SYMBOL(clk_get_rate);
core_initcall(sa11xx_clk_init);