arch/arm/mach-msm/rpm_stats.c - kernel/msm - Gitiles

 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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/debugfs.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/types.h>
 #include <linux/of.h>
 #include <asm/uaccess.h>
 #include <asm/arch_timer.h>
 #include <mach/msm_iomap.h>
 #include "rpm_stats.h"


 enum {
 	ID_COUNTER,
 	ID_ACCUM_TIME_SCLK,
 	ID_MAX,
 };

 static char *msm_rpmstats_id_labels[ID_MAX] = {
 	[ID_COUNTER] = "Count",
 	[ID_ACCUM_TIME_SCLK] = "Total time(uSec)",
 };

 #define SCLK_HZ 32768
 #define MSM_ARCH_TIMER_FREQ 19200000

 struct msm_rpmstats_record{
 	char		name[32];
 	uint32_t	id;
 	uint32_t	val;
 };
 struct msm_rpmstats_private_data{
 	void __iomem *reg_base;
 	u32 num_records;
 	u32 read_idx;
 	u32 len;
 	char buf[256];
 	struct msm_rpmstats_platform_data *platform_data;
 };

 struct msm_rpm_stats_data_v2 {
 	u32 stat_type;
 	u32 count;
 	u64 last_entered_at;
 	u64 last_exited_at;
 };

 static inline u64 get_time_in_sec(u64 counter)
 {
 	do_div(counter, MSM_ARCH_TIMER_FREQ);
 	return counter;
 }

 static inline u64 get_time_in_msec(u64 counter)
 {
 	do_div(counter, MSM_ARCH_TIMER_FREQ);
 	counter *= MSEC_PER_SEC;
 	return counter;
 }

 static inline int msm_rpmstats_append_data_to_buf(char *buf,
 		struct msm_rpm_stats_data_v2 *data, int buflength)
 {
 	char stat_type[5];
 	u64 time_in_last_mode;
 	u64 time_since_last_mode;

 	stat_type[4] = 0;
 	memcpy(stat_type, &data->stat_type, sizeof(u32));

 	time_in_last_mode = data->last_exited_at - data->last_entered_at;
 	time_in_last_mode = get_time_in_msec(time_in_last_mode);
 	time_since_last_mode = arch_counter_get_cntpct() - data->last_exited_at;
 	time_since_last_mode = get_time_in_sec(time_since_last_mode);

 	return  snprintf(buf , buflength,
 		"RPM Mode:%s\n\t count:%d\n time in last mode(msec):%llu\n"
 		"time since last mode(sec):%llu\n",
 		stat_type, data->count, time_in_last_mode,
 		time_since_last_mode);
 }

 static inline u32 msm_rpmstats_read_long_register_v2(void __iomem *regbase,
 		int index, int offset)
 {
 	return readl_relaxed(regbase + offset +
 			index * sizeof(struct msm_rpm_stats_data_v2));
 }

 static inline u64 msm_rpmstats_read_quad_register_v2(void __iomem *regbase,
 		int index, int offset)
 {
 	u64 dst;
 	memcpy_fromio(&dst,
 		regbase + offset + index * sizeof(struct msm_rpm_stats_data_v2),
 		8);
 	return dst;
 }

 static inline int msm_rpmstats_copy_stats_v2(
 			struct msm_rpmstats_private_data *prvdata)
 {
 	void __iomem *reg;
 	struct msm_rpm_stats_data_v2 data;
 	int i, length;

 	reg = prvdata->reg_base;

 	for (i = 0, length = 0; i < prvdata->num_records; i++) {

 		data.stat_type = msm_rpmstats_read_long_register_v2(reg, i,
 				offsetof(struct msm_rpm_stats_data_v2,
 					stat_type));
 		data.count = msm_rpmstats_read_long_register_v2(reg, i,
 				offsetof(struct msm_rpm_stats_data_v2, count));
 		data.last_entered_at = msm_rpmstats_read_quad_register_v2(reg,
 				i, offsetof(struct msm_rpm_stats_data_v2,
 					last_entered_at));
 		data.last_exited_at = msm_rpmstats_read_quad_register_v2(reg,
 				i, offsetof(struct msm_rpm_stats_data_v2,
 					last_exited_at));

 		length += msm_rpmstats_append_data_to_buf(prvdata->buf + length,
 				&data, sizeof(prvdata->buf) - length);
 		prvdata->read_idx++;
 	}
 	return length;
 }

 static inline unsigned long  msm_rpmstats_read_register(void __iomem *regbase,
 		int index, int offset)
 {
 	return  readl_relaxed(regbase + index * 12 + (offset + 1) * 4);
 }
 static void msm_rpmstats_strcpy(char *dest, char  *src)
 {
 	union {
 		char ch[4];
 		unsigned long word;
 	} string;
 	int index = 0;

 	do  {
 		int i;
 		string.word = readl_relaxed(src + 4 * index);
 		for (i = 0; i < 4; i++) {
 			*dest++ = string.ch[i];
 			if (!string.ch[i])
 				break;
 		}
 		index++;
 	} while (*(dest-1));

 }
 static int msm_rpmstats_copy_stats(struct msm_rpmstats_private_data *pdata)
 {

 	struct msm_rpmstats_record record;
 	unsigned long ptr;
 	unsigned long offset;
 	char *str;
 	uint64_t usec;

 	ptr = msm_rpmstats_read_register(pdata->reg_base, pdata->read_idx, 0);
 	offset = (ptr - (unsigned long)pdata->platform_data->phys_addr_base);

 	if (offset > pdata->platform_data->phys_size)
 		str = (char *)ioremap(ptr, SZ_256);
 	else
 		str = (char *) pdata->reg_base + offset;

 	msm_rpmstats_strcpy(record.name, str);

 	if (offset > pdata->platform_data->phys_size)
 		iounmap(str);

 	record.id = msm_rpmstats_read_register(pdata->reg_base,
 						pdata->read_idx, 1);
 	record.val = msm_rpmstats_read_register(pdata->reg_base,
 						pdata->read_idx, 2);

 	if (record.id == ID_ACCUM_TIME_SCLK) {
 		usec = record.val * USEC_PER_SEC;
 		do_div(usec, SCLK_HZ);
 	}  else
 		usec = (unsigned long)record.val;

 	pdata->read_idx++;

 	return snprintf(pdata->buf, sizeof(pdata->buf),
 			"RPM Mode:%s\n\t%s:%llu\n",
 			record.name,
 			msm_rpmstats_id_labels[record.id],
 			usec);
 }

 static int msm_rpmstats_file_read(struct file *file, char __user *bufu,
 				  size_t count, loff_t *ppos)
 {
 	struct msm_rpmstats_private_data *prvdata;
 	prvdata = file->private_data;

 	if (!prvdata)
 		return -EINVAL;

 	if (!bufu || count == 0)
 		return -EINVAL;

 	if (prvdata->platform_data->version == 1) {
 		if (!prvdata->num_records)
 			prvdata->num_records = readl_relaxed(prvdata->reg_base);
 	}

 	if ((*ppos >= prvdata->len)
 		&& (prvdata->read_idx < prvdata->num_records)) {
 			if (prvdata->platform_data->version == 1)
 				prvdata->len = msm_rpmstats_copy_stats(prvdata);
 			else if (prvdata->platform_data->version == 2)
 				prvdata->len = msm_rpmstats_copy_stats_v2(
 						prvdata);
 			*ppos = 0;
 	}

 	return simple_read_from_buffer(bufu, count, ppos,
 			prvdata->buf, prvdata->len);
 }

 static int msm_rpmstats_file_open(struct inode *inode, struct file *file)
 {
 	struct msm_rpmstats_private_data *prvdata;
 	struct msm_rpmstats_platform_data *pdata;

 	pdata = inode->i_private;

 	file->private_data =
 		kmalloc(sizeof(struct msm_rpmstats_private_data), GFP_KERNEL);

 	if (!file->private_data)
 		return -ENOMEM;
 	prvdata = file->private_data;

 	prvdata->reg_base = ioremap_nocache(pdata->phys_addr_base,
 					pdata->phys_size);
 	if (!prvdata->reg_base) {
 		kfree(file->private_data);
 		prvdata = NULL;
 		pr_err("%s: ERROR could not ioremap start=%p, len=%u\n",
 			__func__, (void *)pdata->phys_addr_base,
 			pdata->phys_size);
 		return -EBUSY;
 	}

 	prvdata->read_idx = prvdata->num_records =  prvdata->len = 0;
 	prvdata->platform_data = pdata;
 	if (pdata->version == 2)
 		prvdata->num_records = 2;

 	return 0;
 }

 static int msm_rpmstats_file_close(struct inode *inode, struct file *file)
 {
 	struct msm_rpmstats_private_data *private = file->private_data;

 	if (private->reg_base)
 		iounmap(private->reg_base);
 	kfree(file->private_data);

 	return 0;
 }

 static const struct file_operations msm_rpmstats_fops = {
 	.owner	  = THIS_MODULE,
 	.open	  = msm_rpmstats_file_open,
 	.read	  = msm_rpmstats_file_read,
 	.release  = msm_rpmstats_file_close,
 	.llseek   = no_llseek,
 };

 static  int __devinit msm_rpmstats_probe(struct platform_device *pdev)
 {
 	struct dentry *dent = NULL;
 	struct msm_rpmstats_platform_data *pdata;
 	struct msm_rpmstats_platform_data *pd;
 	struct resource *res = NULL;
 	struct device_node *node = NULL;
 	int ret = 0;

 	if (!pdev)
 		return -EINVAL;

 	pdata = kzalloc(sizeof(struct msm_rpmstats_platform_data), GFP_KERNEL);

 	if (!pdata)
 		return -ENOMEM;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

 	if (!res)
 		return -EINVAL;

 	pdata->phys_addr_base  = res->start;

 	pdata->phys_size = resource_size(res);
 	node = pdev->dev.of_node;
 	if (pdev->dev.platform_data) {
 		pd = pdev->dev.platform_data;
 		pdata->version = pd->version;

 	} else if (node)
 		ret = of_property_read_u32(node,
 			"qcom,sleep-stats-version", &pdata->version);

 	if (!ret) {

 		dent = debugfs_create_file("rpm_stats", S_IRUGO, NULL,
 				pdata, &msm_rpmstats_fops);

 		if (!dent) {
 			pr_err("%s: ERROR debugfs_create_file failed\n",
 					__func__);
 			kfree(pdata);
 			return -ENOMEM;
 		}

 	} else {
 		kfree(pdata);
 		return -EINVAL;
 	}
 	platform_set_drvdata(pdev, dent);
 	return 0;
 }

 static int __devexit msm_rpmstats_remove(struct platform_device *pdev)
 {
 	struct dentry *dent;

 	dent = platform_get_drvdata(pdev);
 	debugfs_remove(dent);
 	platform_set_drvdata(pdev, NULL);
 	return 0;
 }

 static struct of_device_id rpm_stats_table[] = {
 	       {.compatible = "qcom,rpm-stats"},
 	       {},
 };

 static struct platform_driver msm_rpmstats_driver = {
 	.probe	= msm_rpmstats_probe,
 	.remove = __devexit_p(msm_rpmstats_remove),
 	.driver = {
 		.name = "msm_rpm_stat",
 		.owner = THIS_MODULE,
 		.of_match_table = rpm_stats_table,
 	},
 };
 static int __init msm_rpmstats_init(void)
 {
 	return platform_driver_register(&msm_rpmstats_driver);
 }
 static void __exit msm_rpmstats_exit(void)
 {
 	platform_driver_unregister(&msm_rpmstats_driver);
 }
 module_init(msm_rpmstats_init);
 module_exit(msm_rpmstats_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("MSM RPM Statistics driver");
 MODULE_VERSION("1.0");
 MODULE_ALIAS("platform:msm_stat_log");
	/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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/debugfs.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/mm.h>
	#include <linux/types.h>
	#include <linux/of.h>
	#include <asm/uaccess.h>
	#include <asm/arch_timer.h>
	#include <mach/msm_iomap.h>
	#include "rpm_stats.h"


	enum {
	ID_COUNTER,
	ID_ACCUM_TIME_SCLK,
	ID_MAX,
	};

	static char *msm_rpmstats_id_labels[ID_MAX] = {
	[ID_COUNTER] = "Count",
	[ID_ACCUM_TIME_SCLK] = "Total time(uSec)",
	};

	#define SCLK_HZ 32768
	#define MSM_ARCH_TIMER_FREQ 19200000

	struct msm_rpmstats_record{
	char name[32];
	uint32_t id;
	uint32_t val;
	};
	struct msm_rpmstats_private_data{
	void __iomem *reg_base;
	u32 num_records;
	u32 read_idx;
	u32 len;
	char buf[256];
	struct msm_rpmstats_platform_data *platform_data;
	};

	struct msm_rpm_stats_data_v2 {
	u32 stat_type;
	u32 count;
	u64 last_entered_at;
	u64 last_exited_at;
	};

	static inline u64 get_time_in_sec(u64 counter)
	{
	do_div(counter, MSM_ARCH_TIMER_FREQ);
	return counter;
	}

	static inline u64 get_time_in_msec(u64 counter)
	{
	do_div(counter, MSM_ARCH_TIMER_FREQ);
	counter *= MSEC_PER_SEC;
	return counter;
	}

	static inline int msm_rpmstats_append_data_to_buf(char *buf,
	struct msm_rpm_stats_data_v2 *data, int buflength)
	{
	char stat_type[5];
	u64 time_in_last_mode;
	u64 time_since_last_mode;

	stat_type[4] = 0;
	memcpy(stat_type, &data->stat_type, sizeof(u32));

	time_in_last_mode = data->last_exited_at - data->last_entered_at;
	time_in_last_mode = get_time_in_msec(time_in_last_mode);
	time_since_last_mode = arch_counter_get_cntpct() - data->last_exited_at;
	time_since_last_mode = get_time_in_sec(time_since_last_mode);

	return snprintf(buf , buflength,
	"RPM Mode:%s\n\t count:%d\n time in last mode(msec):%llu\n"
	"time since last mode(sec):%llu\n",
	stat_type, data->count, time_in_last_mode,
	time_since_last_mode);
	}

	static inline u32 msm_rpmstats_read_long_register_v2(void __iomem *regbase,
	int index, int offset)
	{
	return readl_relaxed(regbase + offset +
	index * sizeof(struct msm_rpm_stats_data_v2));
	}

	static inline u64 msm_rpmstats_read_quad_register_v2(void __iomem *regbase,
	int index, int offset)
	{
	u64 dst;
	memcpy_fromio(&dst,
	regbase + offset + index * sizeof(struct msm_rpm_stats_data_v2),
	8);
	return dst;
	}

	static inline int msm_rpmstats_copy_stats_v2(
	struct msm_rpmstats_private_data *prvdata)
	{
	void __iomem *reg;
	struct msm_rpm_stats_data_v2 data;
	int i, length;

	reg = prvdata->reg_base;

	for (i = 0, length = 0; i < prvdata->num_records; i++) {

	data.stat_type = msm_rpmstats_read_long_register_v2(reg, i,
	offsetof(struct msm_rpm_stats_data_v2,
	stat_type));
	data.count = msm_rpmstats_read_long_register_v2(reg, i,
	offsetof(struct msm_rpm_stats_data_v2, count));
	data.last_entered_at = msm_rpmstats_read_quad_register_v2(reg,
	i, offsetof(struct msm_rpm_stats_data_v2,
	last_entered_at));
	data.last_exited_at = msm_rpmstats_read_quad_register_v2(reg,
	i, offsetof(struct msm_rpm_stats_data_v2,
	last_exited_at));

	length += msm_rpmstats_append_data_to_buf(prvdata->buf + length,
	&data, sizeof(prvdata->buf) - length);
	prvdata->read_idx++;
	}
	return length;
	}

	static inline unsigned long msm_rpmstats_read_register(void __iomem *regbase,
	int index, int offset)
	{
	return readl_relaxed(regbase + index * 12 + (offset + 1) * 4);
	}
	static void msm_rpmstats_strcpy(char dest, char src)
	{
	union {
	char ch[4];
	unsigned long word;
	} string;
	int index = 0;

	do {
	int i;
	string.word = readl_relaxed(src + 4 * index);
	for (i = 0; i < 4; i++) {
	*dest++ = string.ch[i];
	if (!string.ch[i])
	break;
	}
	index++;
	} while (*(dest-1));

	}
	static int msm_rpmstats_copy_stats(struct msm_rpmstats_private_data *pdata)
	{

	struct msm_rpmstats_record record;
	unsigned long ptr;
	unsigned long offset;
	char *str;
	uint64_t usec;

	ptr = msm_rpmstats_read_register(pdata->reg_base, pdata->read_idx, 0);
	offset = (ptr - (unsigned long)pdata->platform_data->phys_addr_base);

	if (offset > pdata->platform_data->phys_size)
	str = (char *)ioremap(ptr, SZ_256);
	else
	str = (char *) pdata->reg_base + offset;

	msm_rpmstats_strcpy(record.name, str);

	if (offset > pdata->platform_data->phys_size)
	iounmap(str);

	record.id = msm_rpmstats_read_register(pdata->reg_base,
	pdata->read_idx, 1);
	record.val = msm_rpmstats_read_register(pdata->reg_base,
	pdata->read_idx, 2);

	if (record.id == ID_ACCUM_TIME_SCLK) {
	usec = record.val * USEC_PER_SEC;
	do_div(usec, SCLK_HZ);
	} else
	usec = (unsigned long)record.val;

	pdata->read_idx++;

	return snprintf(pdata->buf, sizeof(pdata->buf),
	"RPM Mode:%s\n\t%s:%llu\n",
	record.name,
	msm_rpmstats_id_labels[record.id],
	usec);
	}

	static int msm_rpmstats_file_read(struct file file, char __user bufu,
	size_t count, loff_t *ppos)
	{
	struct msm_rpmstats_private_data *prvdata;
	prvdata = file->private_data;

	if (!prvdata)
	return -EINVAL;

	if (!bufu \|\| count == 0)
	return -EINVAL;

	if (prvdata->platform_data->version == 1) {
	if (!prvdata->num_records)
	prvdata->num_records = readl_relaxed(prvdata->reg_base);
	}

	if ((*ppos >= prvdata->len)
	&& (prvdata->read_idx < prvdata->num_records)) {
	if (prvdata->platform_data->version == 1)
	prvdata->len = msm_rpmstats_copy_stats(prvdata);
	else if (prvdata->platform_data->version == 2)
	prvdata->len = msm_rpmstats_copy_stats_v2(
	prvdata);
	*ppos = 0;
	}

	return simple_read_from_buffer(bufu, count, ppos,
	prvdata->buf, prvdata->len);
	}

	static int msm_rpmstats_file_open(struct inode inode, struct file file)
	{
	struct msm_rpmstats_private_data *prvdata;
	struct msm_rpmstats_platform_data *pdata;

	pdata = inode->i_private;

	file->private_data =
	kmalloc(sizeof(struct msm_rpmstats_private_data), GFP_KERNEL);

	if (!file->private_data)
	return -ENOMEM;
	prvdata = file->private_data;

	prvdata->reg_base = ioremap_nocache(pdata->phys_addr_base,
	pdata->phys_size);
	if (!prvdata->reg_base) {
	kfree(file->private_data);
	prvdata = NULL;
	pr_err("%s: ERROR could not ioremap start=%p, len=%u\n",
	__func__, (void *)pdata->phys_addr_base,
	pdata->phys_size);
	return -EBUSY;
	}

	prvdata->read_idx = prvdata->num_records = prvdata->len = 0;
	prvdata->platform_data = pdata;
	if (pdata->version == 2)
	prvdata->num_records = 2;

	return 0;
	}

	static int msm_rpmstats_file_close(struct inode inode, struct file file)
	{
	struct msm_rpmstats_private_data *private = file->private_data;

	if (private->reg_base)
	iounmap(private->reg_base);
	kfree(file->private_data);

	return 0;
	}

	static const struct file_operations msm_rpmstats_fops = {
	.owner = THIS_MODULE,
	.open = msm_rpmstats_file_open,
	.read = msm_rpmstats_file_read,
	.release = msm_rpmstats_file_close,
	.llseek = no_llseek,
	};

	static int __devinit msm_rpmstats_probe(struct platform_device *pdev)
	{
	struct dentry *dent = NULL;
	struct msm_rpmstats_platform_data *pdata;
	struct msm_rpmstats_platform_data *pd;
	struct resource *res = NULL;
	struct device_node *node = NULL;
	int ret = 0;

	if (!pdev)
	return -EINVAL;

	pdata = kzalloc(sizeof(struct msm_rpmstats_platform_data), GFP_KERNEL);

	if (!pdata)
	return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)
	return -EINVAL;

	pdata->phys_addr_base = res->start;

	pdata->phys_size = resource_size(res);
	node = pdev->dev.of_node;
	if (pdev->dev.platform_data) {
	pd = pdev->dev.platform_data;
	pdata->version = pd->version;

	} else if (node)
	ret = of_property_read_u32(node,
	"qcom,sleep-stats-version", &pdata->version);

	if (!ret) {

	dent = debugfs_create_file("rpm_stats", S_IRUGO, NULL,
	pdata, &msm_rpmstats_fops);

	if (!dent) {
	pr_err("%s: ERROR debugfs_create_file failed\n",
	__func__);
	kfree(pdata);
	return -ENOMEM;
	}

	} else {
	kfree(pdata);
	return -EINVAL;
	}
	platform_set_drvdata(pdev, dent);
	return 0;
	}

	static int __devexit msm_rpmstats_remove(struct platform_device *pdev)
	{
	struct dentry *dent;

	dent = platform_get_drvdata(pdev);
	debugfs_remove(dent);
	platform_set_drvdata(pdev, NULL);
	return 0;
	}

	static struct of_device_id rpm_stats_table[] = {
	{.compatible = "qcom,rpm-stats"},
	{},
	};

	static struct platform_driver msm_rpmstats_driver = {
	.probe = msm_rpmstats_probe,
	.remove = __devexit_p(msm_rpmstats_remove),
	.driver = {
	.name = "msm_rpm_stat",
	.owner = THIS_MODULE,
	.of_match_table = rpm_stats_table,
	},
	};
	static int __init msm_rpmstats_init(void)
	{
	return platform_driver_register(&msm_rpmstats_driver);
	}
	static void __exit msm_rpmstats_exit(void)
	{
	platform_driver_unregister(&msm_rpmstats_driver);
	}
	module_init(msm_rpmstats_init);
	module_exit(msm_rpmstats_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("MSM RPM Statistics driver");
	MODULE_VERSION("1.0");
	MODULE_ALIAS("platform:msm_stat_log");