drivers/devfreq/devfreq_devbw.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2013-2014, 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.
  */

 #define pr_fmt(fmt) "devbw: " fmt

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/delay.h>
 #include <linux/ktime.h>
 #include <linux/time.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/mutex.h>
 #include <linux/interrupt.h>
 #include <linux/devfreq.h>
 #include <linux/of.h>
 #include <trace/events/power.h>
 #include <linux/msm-bus.h>
 #include <linux/msm-bus-board.h>

 /* Has to be ULL to prevent overflow where this macro is used. */
 #define MBYTE (1ULL << 20)
 #define MAX_PATHS	2
 #define DBL_BUF		2

 struct dev_data {
 	struct msm_bus_vectors vectors[MAX_PATHS * DBL_BUF];
 	struct msm_bus_paths bw_levels[DBL_BUF];
 	struct msm_bus_scale_pdata bw_data;
 	int num_paths;
 	u32 bus_client;
 	int cur_idx;
 	int cur_ab;
 	int cur_ib;
 	long gov_ab;
 	struct devfreq *df;
 	struct devfreq_dev_profile dp;
 };

 static int set_bw(struct device *dev, int new_ib, int new_ab)
 {
 	struct dev_data *d = dev_get_drvdata(dev);
 	int i, ret;

 	if (d->cur_ib == new_ib && d->cur_ab == new_ab)
 		return 0;

 	i = (d->cur_idx + 1) % DBL_BUF;

 	d->bw_levels[i].vectors[0].ib = new_ib * MBYTE;
 	d->bw_levels[i].vectors[0].ab = new_ab / d->num_paths * MBYTE;
 	d->bw_levels[i].vectors[1].ib = new_ib * MBYTE;
 	d->bw_levels[i].vectors[1].ab = new_ab / d->num_paths * MBYTE;

 	dev_dbg(dev, "BW MBps: AB: %d IB: %d\n", new_ab, new_ib);

 	ret = msm_bus_scale_client_update_request(d->bus_client, i);
 	if (ret) {
 		dev_err(dev, "bandwidth request failed (%d)\n", ret);
 	} else {
 		d->cur_idx = i;
 		d->cur_ib = new_ib;
 		d->cur_ab = new_ab;
 	}

 	return ret;
 }

 static void find_freq(struct devfreq_dev_profile *p, unsigned long *freq,
 			u32 flags)
 {
 	int i;
 	unsigned long atmost, atleast, f;

 	atmost = p->freq_table[0];
 	atleast = p->freq_table[p->max_state-1];
 	for (i = 0; i < p->max_state; i++) {
 		f = p->freq_table[i];
 		if (f <= *freq)
 			atmost = max(f, atmost);
 		if (f >= *freq)
 			atleast = min(f, atleast);
 	}

 	if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND)
 		*freq = atmost;
 	else
 		*freq = atleast;
 }

 static int devbw_target(struct device *dev, unsigned long *freq, u32 flags)
 {
 	struct dev_data *d = dev_get_drvdata(dev);

 	find_freq(&d->dp, freq, flags);
 	return set_bw(dev, *freq, d->gov_ab);
 }

 static int devbw_get_dev_status(struct device *dev,
 				struct devfreq_dev_status *stat)
 {
 	struct dev_data *d = dev_get_drvdata(dev);

 	stat->private_data = &d->gov_ab;
 	return 0;
 }

 #define PROP_PORTS "qcom,src-dst-ports"
 #define PROP_TBL "qcom,bw-tbl"
 #define PROP_ACTIVE "qcom,active-only"

 int devfreq_add_devbw(struct device *dev)
 {
 	struct dev_data *d;
 	struct devfreq_dev_profile *p;
 	u32 *data, ports[MAX_PATHS * 2];
 	const char *gov_name;
 	int ret, len, i, num_paths;

 	d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 	if (!d)
 		return -ENOMEM;
 	dev_set_drvdata(dev, d);

 	if (of_find_property(dev->of_node, PROP_PORTS, &len)) {
 		len /= sizeof(ports[0]);
 		if (len % 2 || len > ARRAY_SIZE(ports)) {
 			dev_err(dev, "Unexpected number of ports\n");
 			return -EINVAL;
 		}

 		ret = of_property_read_u32_array(dev->of_node, PROP_PORTS,
 						 ports, len);
 		if (ret)
 			return ret;

 		num_paths = len / 2;
 	} else {
 		return -EINVAL;
 	}

 	d->bw_levels[0].vectors = &d->vectors[0];
 	d->bw_levels[1].vectors = &d->vectors[MAX_PATHS];
 	d->bw_data.usecase = d->bw_levels;
 	d->bw_data.num_usecases = ARRAY_SIZE(d->bw_levels);
 	d->bw_data.name = dev_name(dev);
 	d->bw_data.active_only = of_property_read_bool(dev->of_node,
 							PROP_ACTIVE);

 	for (i = 0; i < num_paths; i++) {
 		d->bw_levels[0].vectors[i].src = ports[2 * i];
 		d->bw_levels[0].vectors[i].dst = ports[2 * i + 1];
 		d->bw_levels[1].vectors[i].src = ports[2 * i];
 		d->bw_levels[1].vectors[i].dst = ports[2 * i + 1];
 	}
 	d->bw_levels[0].num_paths = num_paths;
 	d->bw_levels[1].num_paths = num_paths;
 	d->num_paths = num_paths;

 	p = &d->dp;
 	p->polling_ms = 50;
 	p->target = devbw_target;
 	p->get_dev_status = devbw_get_dev_status;

 	if (of_find_property(dev->of_node, PROP_TBL, &len)) {
 		len /= sizeof(*data);
 		data = devm_kzalloc(dev, len * sizeof(*data), GFP_KERNEL);
 		if (!data)
 			return -ENOMEM;

 		p->freq_table = devm_kzalloc(dev,
 					     len * sizeof(*p->freq_table),
 					     GFP_KERNEL);
 		if (!p->freq_table)
 			return -ENOMEM;

 		ret = of_property_read_u32_array(dev->of_node, PROP_TBL,
 						 data, len);
 		if (ret)
 			return ret;

 		for (i = 0; i < len; i++)
 			p->freq_table[i] = data[i];
 		p->max_state = len;
 	}

 	d->bus_client = msm_bus_scale_register_client(&d->bw_data);
 	if (!d->bus_client) {
 		dev_err(dev, "Unable to register bus client\n");
 		return -ENODEV;
 	}

 	if (of_property_read_string(dev->of_node, "governor", &gov_name))
 		gov_name = "performance";

 	d->df = devfreq_add_device(dev, p, gov_name, NULL);
 	if (IS_ERR(d->df)) {
 		msm_bus_scale_unregister_client(d->bus_client);
 		return PTR_ERR(d->df);
 	}

 	return 0;
 }

 int devfreq_remove_devbw(struct device *dev)
 {
 	struct dev_data *d = dev_get_drvdata(dev);

 	msm_bus_scale_unregister_client(d->bus_client);
 	devfreq_remove_device(d->df);
 	return 0;
 }

 int devfreq_suspend_devbw(struct device *dev)
 {
 	struct dev_data *d = dev_get_drvdata(dev);

 	return devfreq_suspend_device(d->df);
 }

 int devfreq_resume_devbw(struct device *dev)
 {
 	struct dev_data *d = dev_get_drvdata(dev);

 	return devfreq_resume_device(d->df);
 }

 static int devfreq_devbw_probe(struct platform_device *pdev)
 {
 	return devfreq_add_devbw(&pdev->dev);
 }

 static int devfreq_devbw_remove(struct platform_device *pdev)
 {
 	return devfreq_remove_devbw(&pdev->dev);
 }

 static const struct of_device_id devbw_match_table[] = {
 	{ .compatible = "qcom,devbw" },
 	{}
 };

 static struct platform_driver devbw_driver = {
 	.probe = devfreq_devbw_probe,
 	.remove = devfreq_devbw_remove,
 	.driver = {
 		.name = "devbw",
 		.of_match_table = devbw_match_table,
 	},
 };

 module_platform_driver(devbw_driver);
 MODULE_DESCRIPTION("Device DDR bandwidth voting driver MSM SoCs");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2013-2014, 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.
	*/

	#define pr_fmt(fmt) "devbw: " fmt

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/delay.h>
	#include <linux/ktime.h>
	#include <linux/time.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/mutex.h>
	#include <linux/interrupt.h>
	#include <linux/devfreq.h>
	#include <linux/of.h>
	#include <trace/events/power.h>
	#include <linux/msm-bus.h>
	#include <linux/msm-bus-board.h>

	/* Has to be ULL to prevent overflow where this macro is used. */
	#define MBYTE (1ULL << 20)
	#define MAX_PATHS 2
	#define DBL_BUF 2

	struct dev_data {
	struct msm_bus_vectors vectors[MAX_PATHS * DBL_BUF];
	struct msm_bus_paths bw_levels[DBL_BUF];
	struct msm_bus_scale_pdata bw_data;
	int num_paths;
	u32 bus_client;
	int cur_idx;
	int cur_ab;
	int cur_ib;
	long gov_ab;
	struct devfreq *df;
	struct devfreq_dev_profile dp;
	};

	static int set_bw(struct device *dev, int new_ib, int new_ab)
	{
	struct dev_data *d = dev_get_drvdata(dev);
	int i, ret;

	if (d->cur_ib == new_ib && d->cur_ab == new_ab)
	return 0;

	i = (d->cur_idx + 1) % DBL_BUF;

	d->bw_levels[i].vectors[0].ib = new_ib * MBYTE;
	d->bw_levels[i].vectors[0].ab = new_ab / d->num_paths * MBYTE;
	d->bw_levels[i].vectors[1].ib = new_ib * MBYTE;
	d->bw_levels[i].vectors[1].ab = new_ab / d->num_paths * MBYTE;

	dev_dbg(dev, "BW MBps: AB: %d IB: %d\n", new_ab, new_ib);

	ret = msm_bus_scale_client_update_request(d->bus_client, i);
	if (ret) {
	dev_err(dev, "bandwidth request failed (%d)\n", ret);
	} else {
	d->cur_idx = i;
	d->cur_ib = new_ib;
	d->cur_ab = new_ab;
	}

	return ret;
	}

	static void find_freq(struct devfreq_dev_profile p, unsigned long freq,
	u32 flags)
	{
	int i;
	unsigned long atmost, atleast, f;

	atmost = p->freq_table[0];
	atleast = p->freq_table[p->max_state-1];
	for (i = 0; i < p->max_state; i++) {
	f = p->freq_table[i];
	if (f <= *freq)
	atmost = max(f, atmost);
	if (f >= *freq)
	atleast = min(f, atleast);
	}

	if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND)
	*freq = atmost;
	else
	*freq = atleast;
	}

	static int devbw_target(struct device dev, unsigned long freq, u32 flags)
	{
	struct dev_data *d = dev_get_drvdata(dev);

	find_freq(&d->dp, freq, flags);
	return set_bw(dev, *freq, d->gov_ab);
	}

	static int devbw_get_dev_status(struct device *dev,
	struct devfreq_dev_status *stat)
	{
	struct dev_data *d = dev_get_drvdata(dev);

	stat->private_data = &d->gov_ab;
	return 0;
	}

	#define PROP_PORTS "qcom,src-dst-ports"
	#define PROP_TBL "qcom,bw-tbl"
	#define PROP_ACTIVE "qcom,active-only"

	int devfreq_add_devbw(struct device *dev)
	{
	struct dev_data *d;
	struct devfreq_dev_profile *p;
	u32 data, ports[MAX_PATHS 2];
	const char *gov_name;
	int ret, len, i, num_paths;

	d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
	if (!d)
	return -ENOMEM;
	dev_set_drvdata(dev, d);

	if (of_find_property(dev->of_node, PROP_PORTS, &len)) {
	len /= sizeof(ports[0]);
	if (len % 2 \|\| len > ARRAY_SIZE(ports)) {
	dev_err(dev, "Unexpected number of ports\n");
	return -EINVAL;
	}

	ret = of_property_read_u32_array(dev->of_node, PROP_PORTS,
	ports, len);
	if (ret)
	return ret;

	num_paths = len / 2;
	} else {
	return -EINVAL;
	}

	d->bw_levels[0].vectors = &d->vectors[0];
	d->bw_levels[1].vectors = &d->vectors[MAX_PATHS];
	d->bw_data.usecase = d->bw_levels;
	d->bw_data.num_usecases = ARRAY_SIZE(d->bw_levels);
	d->bw_data.name = dev_name(dev);
	d->bw_data.active_only = of_property_read_bool(dev->of_node,
	PROP_ACTIVE);

	for (i = 0; i < num_paths; i++) {
	d->bw_levels[0].vectors[i].src = ports[2 * i];
	d->bw_levels[0].vectors[i].dst = ports[2 * i + 1];
	d->bw_levels[1].vectors[i].src = ports[2 * i];
	d->bw_levels[1].vectors[i].dst = ports[2 * i + 1];
	}
	d->bw_levels[0].num_paths = num_paths;
	d->bw_levels[1].num_paths = num_paths;
	d->num_paths = num_paths;

	p = &d->dp;
	p->polling_ms = 50;
	p->target = devbw_target;
	p->get_dev_status = devbw_get_dev_status;

	if (of_find_property(dev->of_node, PROP_TBL, &len)) {
	len /= sizeof(*data);
	data = devm_kzalloc(dev, len * sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	p->freq_table = devm_kzalloc(dev,
	len * sizeof(*p->freq_table),
	GFP_KERNEL);
	if (!p->freq_table)
	return -ENOMEM;

	ret = of_property_read_u32_array(dev->of_node, PROP_TBL,
	data, len);
	if (ret)
	return ret;

	for (i = 0; i < len; i++)
	p->freq_table[i] = data[i];
	p->max_state = len;
	}

	d->bus_client = msm_bus_scale_register_client(&d->bw_data);
	if (!d->bus_client) {
	dev_err(dev, "Unable to register bus client\n");
	return -ENODEV;
	}

	if (of_property_read_string(dev->of_node, "governor", &gov_name))
	gov_name = "performance";

	d->df = devfreq_add_device(dev, p, gov_name, NULL);
	if (IS_ERR(d->df)) {
	msm_bus_scale_unregister_client(d->bus_client);
	return PTR_ERR(d->df);
	}

	return 0;
	}

	int devfreq_remove_devbw(struct device *dev)
	{
	struct dev_data *d = dev_get_drvdata(dev);

	msm_bus_scale_unregister_client(d->bus_client);
	devfreq_remove_device(d->df);
	return 0;
	}

	int devfreq_suspend_devbw(struct device *dev)
	{
	struct dev_data *d = dev_get_drvdata(dev);

	return devfreq_suspend_device(d->df);
	}

	int devfreq_resume_devbw(struct device *dev)
	{
	struct dev_data *d = dev_get_drvdata(dev);

	return devfreq_resume_device(d->df);
	}

	static int devfreq_devbw_probe(struct platform_device *pdev)
	{
	return devfreq_add_devbw(&pdev->dev);
	}

	static int devfreq_devbw_remove(struct platform_device *pdev)
	{
	return devfreq_remove_devbw(&pdev->dev);
	}

	static const struct of_device_id devbw_match_table[] = {
	{ .compatible = "qcom,devbw" },
	{}
	};

	static struct platform_driver devbw_driver = {
	.probe = devfreq_devbw_probe,
	.remove = devfreq_devbw_remove,
	.driver = {
	.name = "devbw",
	.of_match_table = devbw_match_table,
	},
	};

	module_platform_driver(devbw_driver);
	MODULE_DESCRIPTION("Device DDR bandwidth voting driver MSM SoCs");
	MODULE_LICENSE("GPL v2");