ARM: sa1100: clean up of the clock support (edf3ff5b) · Commits · EulixOS / Software / Kernel

arch/arm/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

arch/arm/mach-sa1100/clock.c

+66 −25

Original line number	Diff line number	Diff line
		@@ -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);