Commit 4b9502e1 authored by Shiraz Hashim's avatar Shiraz Hashim Committed by Russell King
Browse files

ARM: 6681/1: SPEAr: add debugfs support to clk API 



Reviewed-by: default avatarStanley Miao <stanley.miao@windriver.com>
Signed-off-by: default avatarShiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@st.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent af89fd81

arch/arm/plat-spear/clock.c

+116 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 


#include <linux/bug.h>

#include <linux/clk.h>

#include <linux/debugfs.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/list.h>
@@ -22,8 +23,14 @@ 


static DEFINE_SPINLOCK(clocks_lock);

static LIST_HEAD(root_clks);

#ifdef CONFIG_DEBUG_FS

static LIST_HEAD(clocks);

#endif



static void propagate_rate(struct clk *, int on_init);

#ifdef CONFIG_DEBUG_FS

static int clk_debugfs_reparent(struct clk *);

#endif



static int generic_clk_enable(struct clk *clk)

{
@@ -96,6 +103,10 @@ static void clk_reparent(struct clk *clk, struct pclk_info *pclk_info) 


	clk->pclk = pclk_info->pclk;

	spin_unlock_irqrestore(&clocks_lock, flags);



#ifdef CONFIG_DEBUG_FS

	clk_debugfs_reparent(clk);

#endif

}



static void do_clk_disable(struct clk *clk)
@@ -336,6 +347,12 @@ void clk_register(struct clk_lookup *cl) 


	spin_unlock_irqrestore(&clocks_lock, flags);



	/* debugfs specific */

#ifdef CONFIG_DEBUG_FS

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

	clk->cl = cl;

#endif



	/* add clock to arm clockdev framework */

	clkdev_add(cl);

}
@@ -885,3 +902,102 @@ void recalc_root_clocks(void) 
	}

	spin_unlock_irqrestore(&clocks_lock, flags);

}



#ifdef CONFIG_DEBUG_FS

/*

 *	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;

	struct clk *pa = c->pclk;

	char s[255];

	char *p = s;



	if (c) {

		if (c->cl->con_id)

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

		if (c->cl->dev_id)

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

	}

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

	if (!d)

		return -ENOMEM;

	c->dent = d;



	d = debugfs_create_u32("usage_count", S_IRUGO, c->dent,

			(u32 *)&c->usage_count);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

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

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

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

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	return 0;



err_out:

	d = c->dent;

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

		debugfs_remove(child);

	debugfs_remove(c->dent);

	return err;

}



static int clk_debugfs_register(struct clk *c)

{

	int err;

	struct clk *pa = c->pclk;



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

		err = clk_debugfs_register(pa);

		if (err)

			return err;

	}



	if (!c->dent) {

		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, &clocks, 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);



static int clk_debugfs_reparent(struct clk *c)

{

	debugfs_remove(c->dent);

	return clk_debugfs_register_one(c);

}

#endif /* CONFIG_DEBUG_FS */

arch/arm/plat-spear/include/plat/clock.h

+8 −0
Original line number Diff line number Diff line
@@ -88,6 +88,9 @@ struct rate_config { 
 * @children: list for childrens or this clock

 * @sibling: node for list of clocks having same parents

 * @private_data: clock specific private data

 * @node: list to maintain clocks linearly

 * @cl: clocklook up assoicated with this clock

 * @dent: object for debugfs

 */

struct clk {

	unsigned int usage_count;
@@ -109,6 +112,11 @@ struct clk { 
	struct list_head children;

	struct list_head sibling;

	void *private_data;

#ifdef CONFIG_DEBUG_FS

	struct list_head node;

	struct clk_lookup *cl;

	struct dentry *dent;

#endif

};



/* pll configuration structure */