Commit 8b5ee113 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: move sh clock.c contents to drivers/sh/clk. 



This patch is V2 of the SH clock framework move from
arch/sh/kernel/cpu/clock.c to drivers/sh/clk.c. All
code except the following functions are moved:
clk_init(), clk_get() and clk_put().

The init function is still kept in clock.c since it
depends on the SH-specific machvec implementation.

The symbols clk_get() and clk_put() already exist in
the common ARM clkdev code, those symbols are left in
the SH tree to avoid duplicating them for SH-Mobile ARM.

Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d28bdf05

arch/sh/include/asm/clock.h

+3 −0
Original line number Diff line number Diff line
@@ -10,4 +10,7 @@ int __init arch_clk_init(void); 
/* arch/sh/kernel/cpu/clock-cpg.c */

int __init __deprecated cpg_clk_init(void);



/* arch/sh/kernel/cpu/clock.c */

int clk_init(void);



#endif /* __ASM_SH_CLOCK_H */

arch/sh/kernel/cpu/clock.c

+8 −535
Original line number Diff line number Diff line
@@ -16,467 +16,10 @@ 
 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/list.h>

#include <linux/kobject.h>

#include <linux/sysdev.h>

#include <linux/seq_file.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/debugfs.h>

#include <linux/cpufreq.h>

#include <linux/clk.h>

#include <asm/clock.h>

#include <asm/machvec.h>



static LIST_HEAD(clock_list);

static DEFINE_SPINLOCK(clock_lock);

static DEFINE_MUTEX(clock_list_sem);



void clk_rate_table_build(struct clk *clk,

			  struct cpufreq_frequency_table *freq_table,

			  int nr_freqs,

			  struct clk_div_mult_table *src_table,

			  unsigned long *bitmap)

{

	unsigned long mult, div;

	unsigned long freq;

	int i;



	for (i = 0; i < nr_freqs; i++) {

		div = 1;

		mult = 1;



		if (src_table->divisors && i < src_table->nr_divisors)

			div = src_table->divisors[i];



		if (src_table->multipliers && i < src_table->nr_multipliers)

			mult = src_table->multipliers[i];



		if (!div || !mult || (bitmap && !test_bit(i, bitmap)))

			freq = CPUFREQ_ENTRY_INVALID;

		else

			freq = clk->parent->rate * mult / div;



		freq_table[i].index = i;

		freq_table[i].frequency = freq;

	}



	/* Termination entry */

	freq_table[i].index = i;

	freq_table[i].frequency = CPUFREQ_TABLE_END;

}



long clk_rate_table_round(struct clk *clk,

			  struct cpufreq_frequency_table *freq_table,

			  unsigned long rate)

{

	unsigned long rate_error, rate_error_prev = ~0UL;

	unsigned long rate_best_fit = rate;

	unsigned long highest, lowest;

	int i;



	highest = lowest = 0;



	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {

		unsigned long freq = freq_table[i].frequency;



		if (freq == CPUFREQ_ENTRY_INVALID)

			continue;



		if (freq > highest)

			highest = freq;

		if (freq < lowest)

			lowest = freq;



		rate_error = abs(freq - rate);

		if (rate_error < rate_error_prev) {

			rate_best_fit = freq;

			rate_error_prev = rate_error;

		}



		if (rate_error == 0)

			break;

	}



	if (rate >= highest)

		rate_best_fit = highest;

	if (rate <= lowest)

		rate_best_fit = lowest;



	return rate_best_fit;

}



int clk_rate_table_find(struct clk *clk,

			struct cpufreq_frequency_table *freq_table,

			unsigned long rate)

{

	int i;



	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {

		unsigned long freq = freq_table[i].frequency;



		if (freq == CPUFREQ_ENTRY_INVALID)

			continue;



		if (freq == rate)

			return i;

	}



	return -ENOENT;

}



/* Used for clocks that always have same value as the parent clock */

unsigned long followparent_recalc(struct clk *clk)

{

	return clk->parent ? clk->parent->rate : 0;

}



int clk_reparent(struct clk *child, struct clk *parent)

{

	list_del_init(&child->sibling);

	if (parent)

		list_add(&child->sibling, &parent->children);

	child->parent = parent;



	/* now do the debugfs renaming to reattach the child

	   to the proper parent */



	return 0;

}



/* Propagate rate to children */

void propagate_rate(struct clk *tclk)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &tclk->children, sibling) {

		if (clkp->ops && clkp->ops->recalc)

			clkp->rate = clkp->ops->recalc(clkp);



		propagate_rate(clkp);

	}

}



static void __clk_disable(struct clk *clk)

{

	if (clk->usecount == 0) {

		printk(KERN_ERR "Trying disable clock %s with 0 usecount\n",

		       clk->name);

		WARN_ON(1);

		return;

	}



	if (!(--clk->usecount)) {

		if (likely(clk->ops && clk->ops->disable))

			clk->ops->disable(clk);

		if (likely(clk->parent))

			__clk_disable(clk->parent);

	}

}



void clk_disable(struct clk *clk)

{

	unsigned long flags;



	if (!clk)

		return;



	spin_lock_irqsave(&clock_lock, flags);

	__clk_disable(clk);

	spin_unlock_irqrestore(&clock_lock, flags);

}

EXPORT_SYMBOL_GPL(clk_disable);



static int __clk_enable(struct clk *clk)

{

	int ret = 0;



	if (clk->usecount++ == 0) {

		if (clk->parent) {

			ret = __clk_enable(clk->parent);

			if (unlikely(ret))

				goto err;

		}



		if (clk->ops && clk->ops->enable) {

			ret = clk->ops->enable(clk);

			if (ret) {

				if (clk->parent)

					__clk_disable(clk->parent);

				goto err;

			}

		}

	}



	return ret;

err:

	clk->usecount--;

	return ret;

}



int clk_enable(struct clk *clk)

{

	unsigned long flags;

	int ret;



	if (!clk)

		return -EINVAL;



	spin_lock_irqsave(&clock_lock, flags);

	ret = __clk_enable(clk);

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_enable);



static LIST_HEAD(root_clks);



/**

 * recalculate_root_clocks - recalculate and propagate all root clocks

 *

 * Recalculates all root clocks (clocks with no parent), which if the

 * clock's .recalc is set correctly, should also propagate their rates.

 * Called at init.

 */

void recalculate_root_clocks(void)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &root_clks, sibling) {

		if (clkp->ops && clkp->ops->recalc)

			clkp->rate = clkp->ops->recalc(clkp);

		propagate_rate(clkp);

	}

}



int clk_register(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;



	/*

	 * trap out already registered clocks

	 */

	if (clk->node.next || clk->node.prev)

		return 0;



	mutex_lock(&clock_list_sem);



	INIT_LIST_HEAD(&clk->children);

	clk->usecount = 0;



	if (clk->parent)

		list_add(&clk->sibling, &clk->parent->children);

	else

		list_add(&clk->sibling, &root_clks);



	list_add(&clk->node, &clock_list);

	if (clk->ops && clk->ops->init)

		clk->ops->init(clk);

	mutex_unlock(&clock_list_sem);



	return 0;

}

EXPORT_SYMBOL_GPL(clk_register);



void clk_unregister(struct clk *clk)

{

	mutex_lock(&clock_list_sem);

	list_del(&clk->sibling);

	list_del(&clk->node);

	mutex_unlock(&clock_list_sem);

}

EXPORT_SYMBOL_GPL(clk_unregister);



static void clk_enable_init_clocks(void)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &clock_list, node)

		if (clkp->flags & CLK_ENABLE_ON_INIT)

			clk_enable(clkp);

}



unsigned long clk_get_rate(struct clk *clk)

{

	return clk->rate;

}

EXPORT_SYMBOL_GPL(clk_get_rate);



int clk_set_rate(struct clk *clk, unsigned long rate)

{

	return clk_set_rate_ex(clk, rate, 0);

}

EXPORT_SYMBOL_GPL(clk_set_rate);



int clk_set_rate_ex(struct clk *clk, unsigned long rate, int algo_id)

{

	int ret = -EOPNOTSUPP;

	unsigned long flags;



	spin_lock_irqsave(&clock_lock, flags);



	if (likely(clk->ops && clk->ops->set_rate)) {

		ret = clk->ops->set_rate(clk, rate, algo_id);

		if (ret != 0)

			goto out_unlock;

	} else {

		clk->rate = rate;

		ret = 0;

	}



	if (clk->ops && clk->ops->recalc)

		clk->rate = clk->ops->recalc(clk);



	propagate_rate(clk);



out_unlock:

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_set_rate_ex);



int clk_set_parent(struct clk *clk, struct clk *parent)

{

	unsigned long flags;

	int ret = -EINVAL;



	if (!parent || !clk)

		return ret;

	if (clk->parent == parent)

		return 0;



	spin_lock_irqsave(&clock_lock, flags);

	if (clk->usecount == 0) {

		if (clk->ops->set_parent)

			ret = clk->ops->set_parent(clk, parent);

		else

			ret = clk_reparent(clk, parent);



		if (ret == 0) {

			pr_debug("clock: set parent of %s to %s (new rate %ld)\n",

				 clk->name, clk->parent->name, clk->rate);

			if (clk->ops->recalc)

				clk->rate = clk->ops->recalc(clk);

			propagate_rate(clk);

		}

	} else

		ret = -EBUSY;

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_set_parent);



struct clk *clk_get_parent(struct clk *clk)

{

	return clk->parent;

}

EXPORT_SYMBOL_GPL(clk_get_parent);



long clk_round_rate(struct clk *clk, unsigned long rate)

{

	if (likely(clk->ops && clk->ops->round_rate)) {

		unsigned long flags, rounded;



		spin_lock_irqsave(&clock_lock, flags);

		rounded = clk->ops->round_rate(clk, rate);

		spin_unlock_irqrestore(&clock_lock, flags);



		return rounded;

	}



	return clk_get_rate(clk);

}

EXPORT_SYMBOL_GPL(clk_round_rate);



/*

 * Returns a clock. Note that we first try to use device id on the bus

 * and clock name. If this fails, we try to use clock name only.

 */

struct clk *clk_get(struct device *dev, const char *con_id)

{

	const char *dev_id = dev ? dev_name(dev) : NULL;



	return clk_get_sys(dev_id, con_id);

}

EXPORT_SYMBOL_GPL(clk_get);



void clk_put(struct clk *clk)

{

}

EXPORT_SYMBOL_GPL(clk_put);



#ifdef CONFIG_PM

static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)

{

	static pm_message_t prev_state;

	struct clk *clkp;



	switch (state.event) {

	case PM_EVENT_ON:

		/* Resumeing from hibernation */

		if (prev_state.event != PM_EVENT_FREEZE)

			break;



		list_for_each_entry(clkp, &clock_list, node) {

			if (likely(clkp->ops)) {

				unsigned long rate = clkp->rate;



				if (likely(clkp->ops->set_parent))

					clkp->ops->set_parent(clkp,

						clkp->parent);

				if (likely(clkp->ops->set_rate))

					clkp->ops->set_rate(clkp,

						rate, NO_CHANGE);

				else if (likely(clkp->ops->recalc))

					clkp->rate = clkp->ops->recalc(clkp);

			}

		}

		break;

	case PM_EVENT_FREEZE:

		break;

	case PM_EVENT_SUSPEND:

		break;

	}



	prev_state = state;

	return 0;

}



static int clks_sysdev_resume(struct sys_device *dev)

{

	return clks_sysdev_suspend(dev, PMSG_ON);

}



static struct sysdev_class clks_sysdev_class = {

	.name = "clks",

};



static struct sysdev_driver clks_sysdev_driver = {

	.suspend = clks_sysdev_suspend,

	.resume = clks_sysdev_resume,

};



static struct sys_device clks_sysdev_dev = {

	.cls = &clks_sysdev_class,

};



static int __init clk_sysdev_init(void)

{

	sysdev_class_register(&clks_sysdev_class);

	sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);

	sysdev_register(&clks_sysdev_dev);



	return 0;

}

subsys_initcall(clk_sysdev_init);

#endif



int __init clk_init(void)

{

	int ret;
@@ -506,89 +49,19 @@ int __init clk_init(void) 
}



/*

 *	debugfs support to trace clock tree hierarchy and attributes

 * Returns a clock. Note that we first try to use device id on the bus

 * and clock name. If this fails, we try to use clock name only.

 */

static struct dentry *clk_debugfs_root;



static int clk_debugfs_register_one(struct clk *c)

struct clk *clk_get(struct device *dev, const char *con_id)

{

	int err;

	struct dentry *d, *child, *child_tmp;

	struct clk *pa = c->parent;

	char s[255];

	char *p = s;



	p += sprintf(p, "%s", c->name);

	if (c->id >= 0)

		sprintf(p, ":%d", c->id);

	d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root);

	if (!d)

		return -ENOMEM;

	c->dentry = d;



	d = debugfs_create_u8("usecount", S_IRUGO, c->dentry, (u8 *)&c->usecount);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	d = debugfs_create_u32("rate", S_IRUGO, c->dentry, (u32 *)&c->rate);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	d = debugfs_create_x32("flags", S_IRUGO, c->dentry, (u32 *)&c->flags);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	return 0;

	const char *dev_id = dev ? dev_name(dev) : NULL;



err_out:

	d = c->dentry;

	list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)

		debugfs_remove(child);

	debugfs_remove(c->dentry);

	return err;

	return clk_get_sys(dev_id, con_id);

}

EXPORT_SYMBOL_GPL(clk_get);



static int clk_debugfs_register(struct clk *c)

void clk_put(struct clk *clk)

{

	int err;

	struct clk *pa = c->parent;



	if (pa && !pa->dentry) {

		err = clk_debugfs_register(pa);

		if (err)

			return err;

	}



	if (!c->dentry && c->name) {

		err = clk_debugfs_register_one(c);

		if (err)

			return err;

	}

	return 0;

}

EXPORT_SYMBOL_GPL(clk_put);

static int __init clk_debugfs_init(void)

{

	struct clk *c;

	struct dentry *d;

	int err;



	d = debugfs_create_dir("clock", NULL);

	if (!d)

		return -ENOMEM;

	clk_debugfs_root = d;



	list_for_each_entry(c, &clock_list, node) {

		err = clk_debugfs_register(c);

		if (err)

			goto err_out;

	}

	return 0;

err_out:

	debugfs_remove_recursive(clk_debugfs_root);

	return err;

}

late_initcall(clk_debugfs_init);

drivers/sh/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,4 +4,5 @@ 
obj-$(CONFIG_SUPERHYWAY)	+= superhyway/

obj-$(CONFIG_MAPLE)		+= maple/

obj-$(CONFIG_GENERIC_GPIO)	+= pfc.o

obj-$(CONFIG_SUPERH)		+= clk.o

obj-y				+= intc.o

drivers/sh/clk.c

0 → 100644
+548 −0
Original line number Diff line number Diff line 
/*

 * drivers/sh/clk.c - SuperH clock framework

 *

 *  Copyright (C) 2005 - 2009  Paul Mundt

 *

 * This clock framework is derived from the OMAP version by:

 *

 *	Copyright (C) 2004 - 2008 Nokia Corporation

 *	Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>

 *

 *  Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com>

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/list.h>

#include <linux/kobject.h>

#include <linux/sysdev.h>

#include <linux/seq_file.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/debugfs.h>

#include <linux/cpufreq.h>

#include <linux/clk.h>

#include <linux/sh_clk.h>



static LIST_HEAD(clock_list);

static DEFINE_SPINLOCK(clock_lock);

static DEFINE_MUTEX(clock_list_sem);



void clk_rate_table_build(struct clk *clk,

			  struct cpufreq_frequency_table *freq_table,

			  int nr_freqs,

			  struct clk_div_mult_table *src_table,

			  unsigned long *bitmap)

{

	unsigned long mult, div;

	unsigned long freq;

	int i;



	for (i = 0; i < nr_freqs; i++) {

		div = 1;

		mult = 1;



		if (src_table->divisors && i < src_table->nr_divisors)

			div = src_table->divisors[i];



		if (src_table->multipliers && i < src_table->nr_multipliers)

			mult = src_table->multipliers[i];



		if (!div || !mult || (bitmap && !test_bit(i, bitmap)))

			freq = CPUFREQ_ENTRY_INVALID;

		else

			freq = clk->parent->rate * mult / div;



		freq_table[i].index = i;

		freq_table[i].frequency = freq;

	}



	/* Termination entry */

	freq_table[i].index = i;

	freq_table[i].frequency = CPUFREQ_TABLE_END;

}



long clk_rate_table_round(struct clk *clk,

			  struct cpufreq_frequency_table *freq_table,

			  unsigned long rate)

{

	unsigned long rate_error, rate_error_prev = ~0UL;

	unsigned long rate_best_fit = rate;

	unsigned long highest, lowest;

	int i;



	highest = lowest = 0;



	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {

		unsigned long freq = freq_table[i].frequency;



		if (freq == CPUFREQ_ENTRY_INVALID)

			continue;



		if (freq > highest)

			highest = freq;

		if (freq < lowest)

			lowest = freq;



		rate_error = abs(freq - rate);

		if (rate_error < rate_error_prev) {

			rate_best_fit = freq;

			rate_error_prev = rate_error;

		}



		if (rate_error == 0)

			break;

	}



	if (rate >= highest)

		rate_best_fit = highest;

	if (rate <= lowest)

		rate_best_fit = lowest;



	return rate_best_fit;

}



int clk_rate_table_find(struct clk *clk,

			struct cpufreq_frequency_table *freq_table,

			unsigned long rate)

{

	int i;



	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {

		unsigned long freq = freq_table[i].frequency;



		if (freq == CPUFREQ_ENTRY_INVALID)

			continue;



		if (freq == rate)

			return i;

	}



	return -ENOENT;

}



/* Used for clocks that always have same value as the parent clock */

unsigned long followparent_recalc(struct clk *clk)

{

	return clk->parent ? clk->parent->rate : 0;

}



int clk_reparent(struct clk *child, struct clk *parent)

{

	list_del_init(&child->sibling);

	if (parent)

		list_add(&child->sibling, &parent->children);

	child->parent = parent;



	/* now do the debugfs renaming to reattach the child

	   to the proper parent */



	return 0;

}



/* Propagate rate to children */

void propagate_rate(struct clk *tclk)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &tclk->children, sibling) {

		if (clkp->ops && clkp->ops->recalc)

			clkp->rate = clkp->ops->recalc(clkp);



		propagate_rate(clkp);

	}

}



static void __clk_disable(struct clk *clk)

{

	if (clk->usecount == 0) {

		printk(KERN_ERR "Trying disable clock %s with 0 usecount\n",

		       clk->name);

		WARN_ON(1);

		return;

	}



	if (!(--clk->usecount)) {

		if (likely(clk->ops && clk->ops->disable))

			clk->ops->disable(clk);

		if (likely(clk->parent))

			__clk_disable(clk->parent);

	}

}



void clk_disable(struct clk *clk)

{

	unsigned long flags;



	if (!clk)

		return;



	spin_lock_irqsave(&clock_lock, flags);

	__clk_disable(clk);

	spin_unlock_irqrestore(&clock_lock, flags);

}

EXPORT_SYMBOL_GPL(clk_disable);



static int __clk_enable(struct clk *clk)

{

	int ret = 0;



	if (clk->usecount++ == 0) {

		if (clk->parent) {

			ret = __clk_enable(clk->parent);

			if (unlikely(ret))

				goto err;

		}



		if (clk->ops && clk->ops->enable) {

			ret = clk->ops->enable(clk);

			if (ret) {

				if (clk->parent)

					__clk_disable(clk->parent);

				goto err;

			}

		}

	}



	return ret;

err:

	clk->usecount--;

	return ret;

}



int clk_enable(struct clk *clk)

{

	unsigned long flags;

	int ret;



	if (!clk)

		return -EINVAL;



	spin_lock_irqsave(&clock_lock, flags);

	ret = __clk_enable(clk);

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_enable);



static LIST_HEAD(root_clks);



/**

 * recalculate_root_clocks - recalculate and propagate all root clocks

 *

 * Recalculates all root clocks (clocks with no parent), which if the

 * clock's .recalc is set correctly, should also propagate their rates.

 * Called at init.

 */

void recalculate_root_clocks(void)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &root_clks, sibling) {

		if (clkp->ops && clkp->ops->recalc)

			clkp->rate = clkp->ops->recalc(clkp);

		propagate_rate(clkp);

	}

}



int clk_register(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;



	/*

	 * trap out already registered clocks

	 */

	if (clk->node.next || clk->node.prev)

		return 0;



	mutex_lock(&clock_list_sem);



	INIT_LIST_HEAD(&clk->children);

	clk->usecount = 0;



	if (clk->parent)

		list_add(&clk->sibling, &clk->parent->children);

	else

		list_add(&clk->sibling, &root_clks);



	list_add(&clk->node, &clock_list);

	if (clk->ops && clk->ops->init)

		clk->ops->init(clk);

	mutex_unlock(&clock_list_sem);



	return 0;

}

EXPORT_SYMBOL_GPL(clk_register);



void clk_unregister(struct clk *clk)

{

	mutex_lock(&clock_list_sem);

	list_del(&clk->sibling);

	list_del(&clk->node);

	mutex_unlock(&clock_list_sem);

}

EXPORT_SYMBOL_GPL(clk_unregister);



void clk_enable_init_clocks(void)

{

	struct clk *clkp;



	list_for_each_entry(clkp, &clock_list, node)

		if (clkp->flags & CLK_ENABLE_ON_INIT)

			clk_enable(clkp);

}



unsigned long clk_get_rate(struct clk *clk)

{

	return clk->rate;

}

EXPORT_SYMBOL_GPL(clk_get_rate);



int clk_set_rate(struct clk *clk, unsigned long rate)

{

	return clk_set_rate_ex(clk, rate, 0);

}

EXPORT_SYMBOL_GPL(clk_set_rate);



int clk_set_rate_ex(struct clk *clk, unsigned long rate, int algo_id)

{

	int ret = -EOPNOTSUPP;

	unsigned long flags;



	spin_lock_irqsave(&clock_lock, flags);



	if (likely(clk->ops && clk->ops->set_rate)) {

		ret = clk->ops->set_rate(clk, rate, algo_id);

		if (ret != 0)

			goto out_unlock;

	} else {

		clk->rate = rate;

		ret = 0;

	}



	if (clk->ops && clk->ops->recalc)

		clk->rate = clk->ops->recalc(clk);



	propagate_rate(clk);



out_unlock:

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_set_rate_ex);



int clk_set_parent(struct clk *clk, struct clk *parent)

{

	unsigned long flags;

	int ret = -EINVAL;



	if (!parent || !clk)

		return ret;

	if (clk->parent == parent)

		return 0;



	spin_lock_irqsave(&clock_lock, flags);

	if (clk->usecount == 0) {

		if (clk->ops->set_parent)

			ret = clk->ops->set_parent(clk, parent);

		else

			ret = clk_reparent(clk, parent);



		if (ret == 0) {

			pr_debug("clock: set parent of %s to %s (new rate %ld)\n",

				 clk->name, clk->parent->name, clk->rate);

			if (clk->ops->recalc)

				clk->rate = clk->ops->recalc(clk);

			propagate_rate(clk);

		}

	} else

		ret = -EBUSY;

	spin_unlock_irqrestore(&clock_lock, flags);



	return ret;

}

EXPORT_SYMBOL_GPL(clk_set_parent);



struct clk *clk_get_parent(struct clk *clk)

{

	return clk->parent;

}

EXPORT_SYMBOL_GPL(clk_get_parent);



long clk_round_rate(struct clk *clk, unsigned long rate)

{

	if (likely(clk->ops && clk->ops->round_rate)) {

		unsigned long flags, rounded;



		spin_lock_irqsave(&clock_lock, flags);

		rounded = clk->ops->round_rate(clk, rate);

		spin_unlock_irqrestore(&clock_lock, flags);



		return rounded;

	}



	return clk_get_rate(clk);

}

EXPORT_SYMBOL_GPL(clk_round_rate);



#ifdef CONFIG_PM

static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)

{

	static pm_message_t prev_state;

	struct clk *clkp;



	switch (state.event) {

	case PM_EVENT_ON:

		/* Resumeing from hibernation */

		if (prev_state.event != PM_EVENT_FREEZE)

			break;



		list_for_each_entry(clkp, &clock_list, node) {

			if (likely(clkp->ops)) {

				unsigned long rate = clkp->rate;



				if (likely(clkp->ops->set_parent))

					clkp->ops->set_parent(clkp,

						clkp->parent);

				if (likely(clkp->ops->set_rate))

					clkp->ops->set_rate(clkp,

						rate, NO_CHANGE);

				else if (likely(clkp->ops->recalc))

					clkp->rate = clkp->ops->recalc(clkp);

			}

		}

		break;

	case PM_EVENT_FREEZE:

		break;

	case PM_EVENT_SUSPEND:

		break;

	}



	prev_state = state;

	return 0;

}



static int clks_sysdev_resume(struct sys_device *dev)

{

	return clks_sysdev_suspend(dev, PMSG_ON);

}



static struct sysdev_class clks_sysdev_class = {

	.name = "clks",

};



static struct sysdev_driver clks_sysdev_driver = {

	.suspend = clks_sysdev_suspend,

	.resume = clks_sysdev_resume,

};



static struct sys_device clks_sysdev_dev = {

	.cls = &clks_sysdev_class,

};



static int __init clk_sysdev_init(void)

{

	sysdev_class_register(&clks_sysdev_class);

	sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);

	sysdev_register(&clks_sysdev_dev);



	return 0;

}

subsys_initcall(clk_sysdev_init);

#endif



/*

 *	debugfs support to trace clock tree hierarchy and attributes

 */

static struct dentry *clk_debugfs_root;



static int clk_debugfs_register_one(struct clk *c)

{

	int err;

	struct dentry *d, *child, *child_tmp;

	struct clk *pa = c->parent;

	char s[255];

	char *p = s;



	p += sprintf(p, "%s", c->name);

	if (c->id >= 0)

		sprintf(p, ":%d", c->id);

	d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root);

	if (!d)

		return -ENOMEM;

	c->dentry = d;



	d = debugfs_create_u8("usecount", S_IRUGO, c->dentry, (u8 *)&c->usecount);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	d = debugfs_create_u32("rate", S_IRUGO, c->dentry, (u32 *)&c->rate);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	d = debugfs_create_x32("flags", S_IRUGO, c->dentry, (u32 *)&c->flags);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	return 0;



err_out:

	d = c->dentry;

	list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)

		debugfs_remove(child);

	debugfs_remove(c->dentry);

	return err;

}



static int clk_debugfs_register(struct clk *c)

{

	int err;

	struct clk *pa = c->parent;



	if (pa && !pa->dentry) {

		err = clk_debugfs_register(pa);

		if (err)

			return err;

	}



	if (!c->dentry && c->name) {

		err = clk_debugfs_register_one(c);

		if (err)

			return err;

	}

	return 0;

}



static int __init clk_debugfs_init(void)

{

	struct clk *c;

	struct dentry *d;

	int err;



	d = debugfs_create_dir("clock", NULL);

	if (!d)

		return -ENOMEM;

	clk_debugfs_root = d;



	list_for_each_entry(c, &clock_list, node) {

		err = clk_debugfs_register(c);

		if (err)

			goto err_out;

	}

	return 0;

err_out:

	debugfs_remove_recursive(clk_debugfs_root);

	return err;

}

late_initcall(clk_debugfs_init);

include/linux/sh_clk.h

+1 −1
Original line number Diff line number Diff line
@@ -47,13 +47,13 @@ struct clk { 
#define CLK_ENABLE_ON_INIT	(1 << 0)



/* arch/sh/kernel/cpu/clock.c */

int clk_init(void);

unsigned long followparent_recalc(struct clk *);

void recalculate_root_clocks(void);

void propagate_rate(struct clk *);

int clk_reparent(struct clk *child, struct clk *parent);

int clk_register(struct clk *);

void clk_unregister(struct clk *);

void clk_enable_init_clocks(void);



/* the exported API, in addition to clk_set_rate */

/**

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