arch/arm/mach-msm/clock-debug.c - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (C) 2007 Google, Inc.
  * Copyright (c) 2007-2012, Code Aurora Forum. All rights reserved.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/clk.h>
 #include <linux/list.h>
 #include <linux/clkdev.h>

 #include "clock.h"

 static int clock_debug_rate_set(void *data, u64 val)
 {
 	struct clk *clock = data;
 	int ret;

 	/* Only increases to max rate will succeed, but that's actually good
 	 * for debugging purposes so we don't check for error. */
 	if (clock->flags & CLKFLAG_MAX)
 		clk_set_max_rate(clock, val);
 	ret = clk_set_rate(clock, val);
 	if (ret)
 		pr_err("clk_set_rate failed (%d)\n", ret);

 	return ret;
 }

 static int clock_debug_rate_get(void *data, u64 *val)
 {
 	struct clk *clock = data;
 	*val = clk_get_rate(clock);
 	return 0;
 }

 DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
 			clock_debug_rate_set, "%llu\n");

 static struct clk *measure;

 static int clock_debug_measure_get(void *data, u64 *val)
 {
 	struct clk *clock = data;
 	int ret, is_hw_gated;

 	/* Check to see if the clock is in hardware gating mode */
 	if (clock->flags & CLKFLAG_HWCG)
 		is_hw_gated = clock->ops->in_hwcg_mode(clock);
 	else
 		is_hw_gated = 0;

 	ret = clk_set_parent(measure, clock);
 	if (!ret) {
 		/*
 		 * Disable hw gating to get accurate rate measurements. Only do
 		 * this if the clock is explictly enabled by software. This
 		 * allows us to detect errors where clocks are on even though
 		 * software is not requesting them to be on due to broken
 		 * hardware gating signals.
 		 */
 		if (is_hw_gated && clock->count)
 			clock->ops->disable_hwcg(clock);
 		*val = clk_get_rate(measure);
 		/* Reenable hwgating if it was disabled */
 		if (is_hw_gated && clock->count)
 			clock->ops->enable_hwcg(clock);
 	}

 	return ret;
 }

 DEFINE_SIMPLE_ATTRIBUTE(clock_measure_fops, clock_debug_measure_get,
 			NULL, "%lld\n");

 static int clock_debug_enable_set(void *data, u64 val)
 {
 	struct clk *clock = data;
 	int rc = 0;

 	if (val)
 		rc = clk_prepare_enable(clock);
 	else
 		clk_disable_unprepare(clock);

 	return rc;
 }

 static int clock_debug_enable_get(void *data, u64 *val)
 {
 	struct clk *clock = data;
 	int enabled;

 	if (clock->ops->is_enabled)
 		enabled = clock->ops->is_enabled(clock);
 	else
 		enabled = !!(clock->count);

 	*val = enabled;
 	return 0;
 }

 DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
 			clock_debug_enable_set, "%lld\n");

 static int clock_debug_local_get(void *data, u64 *val)
 {
 	struct clk *clock = data;

 	*val = clock->ops->is_local(clock);

 	return 0;
 }

 DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
 			NULL, "%llu\n");

 static int clock_debug_hwcg_get(void *data, u64 *val)
 {
 	struct clk *clock = data;
 	*val = !!(clock->flags & CLKFLAG_HWCG);
 	return 0;
 }

 DEFINE_SIMPLE_ATTRIBUTE(clock_hwcg_fops, clock_debug_hwcg_get,
 			NULL, "%llu\n");

 static struct dentry *debugfs_base;
 static u32 debug_suspend;
 static struct clk_lookup *msm_clocks;
 static size_t num_msm_clocks;

 int __init clock_debug_init(struct clock_init_data *data)
 {
 	int ret = 0;

 	debugfs_base = debugfs_create_dir("clk", NULL);
 	if (!debugfs_base)
 		return -ENOMEM;
 	if (!debugfs_create_u32("debug_suspend", S_IRUGO | S_IWUSR,
 				debugfs_base, &debug_suspend)) {
 		debugfs_remove_recursive(debugfs_base);
 		return -ENOMEM;
 	}
 	msm_clocks = data->table;
 	num_msm_clocks = data->size;

 	measure = clk_get_sys("debug", "measure");
 	if (IS_ERR(measure)) {
 		ret = PTR_ERR(measure);
 		measure = NULL;
 	}

 	return ret;
 }


 static int clock_debug_print_clock(struct clk *c)
 {
 	size_t ln = 0;
 	char s[128];

 	if (!c || !c->count)
 		return 0;

 	ln += snprintf(s, sizeof(s), "\t%s", c->dbg_name);
 	while (ln < sizeof(s) && (c = clk_get_parent(c)))
 		ln += snprintf(s + ln, sizeof(s) - ln, " -> %s", c->dbg_name);
 	pr_info("%s\n", s);
 	return 1;
 }

 void clock_debug_print_enabled(void)
 {
 	unsigned i;
 	int cnt = 0;

 	if (likely(!debug_suspend))
 		return;

 	pr_info("Enabled clocks:\n");
 	for (i = 0; i < num_msm_clocks; i++)
 		cnt += clock_debug_print_clock(msm_clocks[i].clk);

 	if (cnt)
 		pr_info("Enabled clock count: %d\n", cnt);
 	else
 		pr_info("No clocks enabled.\n");

 }

 static int list_rates_show(struct seq_file *m, void *unused)
 {
 	struct clk *clock = m->private;
 	int rate, level, fmax = 0, i = 0;

 	/* Find max frequency supported within voltage constraints. */
 	if (!clock->vdd_class) {
 		fmax = INT_MAX;
 	} else {
 		for (level = 0; level < ARRAY_SIZE(clock->fmax); level++)
 			if (clock->fmax[level])
 				fmax = clock->fmax[level];
 	}

 	/*
 	 * List supported frequencies <= fmax. Higher frequencies may appear in
 	 * the frequency table, but are not valid and should not be listed.
 	 */
 	while ((rate = clock->ops->list_rate(clock, i++)) >= 0) {
 		if (rate <= fmax)
 			seq_printf(m, "%u\n", rate);
 	}

 	return 0;
 }

 static int list_rates_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, list_rates_show, inode->i_private);
 }

 static const struct file_operations list_rates_fops = {
 	.open		= list_rates_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 int __init clock_debug_add(struct clk *clock)
 {
 	char temp[50], *ptr;
 	struct dentry *clk_dir;

 	if (!debugfs_base)
 		return -ENOMEM;

 	strlcpy(temp, clock->dbg_name, ARRAY_SIZE(temp));
 	for (ptr = temp; *ptr; ptr++)
 		*ptr = tolower(*ptr);

 	clk_dir = debugfs_create_dir(temp, debugfs_base);
 	if (!clk_dir)
 		return -ENOMEM;

 	if (!debugfs_create_file("rate", S_IRUGO | S_IWUSR, clk_dir,
 				clock, &clock_rate_fops))
 		goto error;

 	if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR, clk_dir,
 				clock, &clock_enable_fops))
 		goto error;

 	if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
 				&clock_local_fops))
 		goto error;

 	if (!debugfs_create_file("has_hw_gating", S_IRUGO, clk_dir, clock,
 				&clock_hwcg_fops))
 		goto error;

 	if (measure &&
 	    !clk_set_parent(measure, clock) &&
 	    !debugfs_create_file("measure", S_IRUGO, clk_dir, clock,
 				&clock_measure_fops))
 		goto error;

 	if (clock->ops->list_rate)
 		if (!debugfs_create_file("list_rates",
 				S_IRUGO, clk_dir, clock, &list_rates_fops))
 			goto error;

 	return 0;
 error:
 	debugfs_remove_recursive(clk_dir);
 	return -ENOMEM;
 }
	/*
	* Copyright (C) 2007 Google, Inc.
	* Copyright (c) 2007-2012, Code Aurora Forum. All rights reserved.
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/ctype.h>
	#include <linux/debugfs.h>
	#include <linux/seq_file.h>
	#include <linux/clk.h>
	#include <linux/list.h>
	#include <linux/clkdev.h>

	#include "clock.h"

	static int clock_debug_rate_set(void *data, u64 val)
	{
	struct clk *clock = data;
	int ret;

	/* Only increases to max rate will succeed, but that's actually good
	* for debugging purposes so we don't check for error. */
	if (clock->flags & CLKFLAG_MAX)
	clk_set_max_rate(clock, val);
	ret = clk_set_rate(clock, val);
	if (ret)
	pr_err("clk_set_rate failed (%d)\n", ret);

	return ret;
	}

	static int clock_debug_rate_get(void data, u64 val)
	{
	struct clk *clock = data;
	*val = clk_get_rate(clock);
	return 0;
	}

	DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
	clock_debug_rate_set, "%llu\n");

	static struct clk *measure;

	static int clock_debug_measure_get(void data, u64 val)
	{
	struct clk *clock = data;
	int ret, is_hw_gated;

	/* Check to see if the clock is in hardware gating mode */
	if (clock->flags & CLKFLAG_HWCG)
	is_hw_gated = clock->ops->in_hwcg_mode(clock);
	else
	is_hw_gated = 0;

	ret = clk_set_parent(measure, clock);
	if (!ret) {
	/*
	* Disable hw gating to get accurate rate measurements. Only do
	* this if the clock is explictly enabled by software. This
	* allows us to detect errors where clocks are on even though
	* software is not requesting them to be on due to broken
	* hardware gating signals.
	*/
	if (is_hw_gated && clock->count)
	clock->ops->disable_hwcg(clock);
	*val = clk_get_rate(measure);
	/* Reenable hwgating if it was disabled */
	if (is_hw_gated && clock->count)
	clock->ops->enable_hwcg(clock);
	}

	return ret;
	}

	DEFINE_SIMPLE_ATTRIBUTE(clock_measure_fops, clock_debug_measure_get,
	NULL, "%lld\n");

	static int clock_debug_enable_set(void *data, u64 val)
	{
	struct clk *clock = data;
	int rc = 0;

	if (val)
	rc = clk_prepare_enable(clock);
	else
	clk_disable_unprepare(clock);

	return rc;
	}

	static int clock_debug_enable_get(void data, u64 val)
	{
	struct clk *clock = data;
	int enabled;

	if (clock->ops->is_enabled)
	enabled = clock->ops->is_enabled(clock);
	else
	enabled = !!(clock->count);

	*val = enabled;
	return 0;
	}

	DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
	clock_debug_enable_set, "%lld\n");

	static int clock_debug_local_get(void data, u64 val)
	{
	struct clk *clock = data;

	*val = clock->ops->is_local(clock);

	return 0;
	}

	DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
	NULL, "%llu\n");

	static int clock_debug_hwcg_get(void data, u64 val)
	{
	struct clk *clock = data;
	*val = !!(clock->flags & CLKFLAG_HWCG);
	return 0;
	}

	DEFINE_SIMPLE_ATTRIBUTE(clock_hwcg_fops, clock_debug_hwcg_get,
	NULL, "%llu\n");

	static struct dentry *debugfs_base;
	static u32 debug_suspend;
	static struct clk_lookup *msm_clocks;
	static size_t num_msm_clocks;

	int __init clock_debug_init(struct clock_init_data *data)
	{
	int ret = 0;

	debugfs_base = debugfs_create_dir("clk", NULL);
	if (!debugfs_base)
	return -ENOMEM;
	if (!debugfs_create_u32("debug_suspend", S_IRUGO \| S_IWUSR,
	debugfs_base, &debug_suspend)) {
	debugfs_remove_recursive(debugfs_base);
	return -ENOMEM;
	}
	msm_clocks = data->table;
	num_msm_clocks = data->size;

	measure = clk_get_sys("debug", "measure");
	if (IS_ERR(measure)) {
	ret = PTR_ERR(measure);
	measure = NULL;
	}

	return ret;
	}


	static int clock_debug_print_clock(struct clk *c)
	{
	size_t ln = 0;
	char s[128];

	if (!c \|\| !c->count)
	return 0;

	ln += snprintf(s, sizeof(s), "\t%s", c->dbg_name);
	while (ln < sizeof(s) && (c = clk_get_parent(c)))
	ln += snprintf(s + ln, sizeof(s) - ln, " -> %s", c->dbg_name);
	pr_info("%s\n", s);
	return 1;
	}

	void clock_debug_print_enabled(void)
	{
	unsigned i;
	int cnt = 0;

	if (likely(!debug_suspend))
	return;

	pr_info("Enabled clocks:\n");
	for (i = 0; i < num_msm_clocks; i++)
	cnt += clock_debug_print_clock(msm_clocks[i].clk);

	if (cnt)
	pr_info("Enabled clock count: %d\n", cnt);
	else
	pr_info("No clocks enabled.\n");

	}

	static int list_rates_show(struct seq_file m, void unused)
	{
	struct clk *clock = m->private;
	int rate, level, fmax = 0, i = 0;

	/* Find max frequency supported within voltage constraints. */
	if (!clock->vdd_class) {
	fmax = INT_MAX;
	} else {
	for (level = 0; level < ARRAY_SIZE(clock->fmax); level++)
	if (clock->fmax[level])
	fmax = clock->fmax[level];
	}

	/*
	* List supported frequencies <= fmax. Higher frequencies may appear in
	* the frequency table, but are not valid and should not be listed.
	*/
	while ((rate = clock->ops->list_rate(clock, i++)) >= 0) {
	if (rate <= fmax)
	seq_printf(m, "%u\n", rate);
	}

	return 0;
	}

	static int list_rates_open(struct inode inode, struct file file)
	{
	return single_open(file, list_rates_show, inode->i_private);
	}

	static const struct file_operations list_rates_fops = {
	.open = list_rates_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	int __init clock_debug_add(struct clk *clock)
	{
	char temp[50], *ptr;
	struct dentry *clk_dir;

	if (!debugfs_base)
	return -ENOMEM;

	strlcpy(temp, clock->dbg_name, ARRAY_SIZE(temp));
	for (ptr = temp; *ptr; ptr++)
	ptr = tolower(ptr);

	clk_dir = debugfs_create_dir(temp, debugfs_base);
	if (!clk_dir)
	return -ENOMEM;

	if (!debugfs_create_file("rate", S_IRUGO \| S_IWUSR, clk_dir,
	clock, &clock_rate_fops))
	goto error;

	if (!debugfs_create_file("enable", S_IRUGO \| S_IWUSR, clk_dir,
	clock, &clock_enable_fops))
	goto error;

	if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
	&clock_local_fops))
	goto error;

	if (!debugfs_create_file("has_hw_gating", S_IRUGO, clk_dir, clock,
	&clock_hwcg_fops))
	goto error;

	if (measure &&
	!clk_set_parent(measure, clock) &&
	!debugfs_create_file("measure", S_IRUGO, clk_dir, clock,
	&clock_measure_fops))
	goto error;

	if (clock->ops->list_rate)
	if (!debugfs_create_file("list_rates",
	S_IRUGO, clk_dir, clock, &list_rates_fops))
	goto error;

	return 0;
	error:
	debugfs_remove_recursive(clk_dir);
	return -ENOMEM;
	}