drivers/coresight/coresight-hwevent.c - kernel/msm - Gitiles

 /* Copyright (c) 2013, 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/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/clk.h>
 #include <linux/of_coresight.h>
 #include <linux/coresight.h>
 #include <linux/of.h>

 #include "coresight-priv.h"

 struct hwevent_mux {
 	phys_addr_t				start;
 	phys_addr_t				end;
 };

 struct hwevent_drvdata {
 	struct device				*dev;
 	struct coresight_device			*csdev;
 	struct clk				*clk;
 	struct mutex				mutex;
 	int					nr_hclk;
 	struct clk				**hclk;
 	int					nr_hmux;
 	struct hwevent_mux			*hmux;
 	bool					enable;
 };

 static int hwevent_enable(struct hwevent_drvdata *drvdata)
 {
 	int ret, i;

 	mutex_lock(&drvdata->mutex);

 	if (drvdata->enable)
 		goto out;

 	ret = clk_prepare_enable(drvdata->clk);
 	if (ret)
 		goto err0;
 	for (i = 0; i < drvdata->nr_hclk; i++) {
 		ret = clk_prepare_enable(drvdata->hclk[i]);
 		if (ret)
 			goto err1;
 	}
 	drvdata->enable = true;
 	dev_info(drvdata->dev, "Hardware Event driver enabled\n");
 out:
 	mutex_unlock(&drvdata->mutex);
 	return 0;
 err1:
 	clk_disable_unprepare(drvdata->clk);
 	for (i--; i >= 0; i--)
 		clk_disable_unprepare(drvdata->hclk[i]);
 err0:
 	mutex_unlock(&drvdata->mutex);
 	return ret;
 }

 static void hwevent_disable(struct hwevent_drvdata *drvdata)
 {
 	int i;

 	mutex_lock(&drvdata->mutex);

 	if (!drvdata->enable)
 		goto out;

 	drvdata->enable = false;
 	clk_disable_unprepare(drvdata->clk);
 	for (i = 0; i < drvdata->nr_hclk; i++)
 		clk_disable_unprepare(drvdata->hclk[i]);
 	dev_info(drvdata->dev, "Hardware Event driver disabled\n");
 out:
 	mutex_unlock(&drvdata->mutex);
 }

 static ssize_t hwevent_show_enable(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
 	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
 	unsigned long val = drvdata->enable;

 	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
 }

 static ssize_t hwevent_store_enable(struct device *dev,
 				    struct device_attribute *attr,
 				    const char *buf, size_t size)
 {
 	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
 	unsigned long val;
 	int ret = 0;

 	if (sscanf(buf, "%lx", &val) != 1)
 		return -EINVAL;

 	if (val)
 		ret = hwevent_enable(drvdata);
 	else
 		hwevent_disable(drvdata);

 	if (ret)
 		return ret;
 	return size;
 }
 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, hwevent_show_enable,
 		   hwevent_store_enable);

 static ssize_t hwevent_store_setreg(struct device *dev,
 				    struct device_attribute *attr,
 				    const char *buf, size_t size)
 {
 	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
 	void *hwereg;
 	unsigned long long addr;
 	unsigned long val;
 	int ret, i;

 	if (sscanf(buf, "%llx %lx", &addr, &val) != 2)
 		return -EINVAL;

 	mutex_lock(&drvdata->mutex);

 	if (!drvdata->enable) {
 		dev_err(dev, "Hardware Event driver not enabled\n");
 		ret = -EINVAL;
 		goto err;
 	}

 	for (i = 0; i < drvdata->nr_hmux; i++) {
 		if ((addr >= drvdata->hmux[i].start) &&
 		    (addr < drvdata->hmux[i].end)) {
 			hwereg = devm_ioremap(dev,
 					      drvdata->hmux[i].start,
 					      drvdata->hmux[i].end -
 					      drvdata->hmux[i].start);
 			if (!hwereg) {
 				dev_err(dev, "unable to map address 0x%llx\n",
 					addr);
 				ret = -ENOMEM;
 				goto err;
 			}
 			writel_relaxed(val, hwereg + addr -
 				       drvdata->hmux[i].start);
 			/* Ensure writes to hwevent control registers
 			   are completed before unmapping the address
 			*/
 			mb();
 			devm_iounmap(dev, hwereg);
 			break;
 		}
 	}

 	if (i == drvdata->nr_hmux) {
 		ret = coresight_csr_hwctrl_set(addr, val);
 		if (ret) {
 			dev_err(dev, "invalid mux control register address\n");
 			ret = -EINVAL;
 			goto err;
 		}
 	}

 	mutex_unlock(&drvdata->mutex);
 	return size;
 err:
 	mutex_unlock(&drvdata->mutex);
 	return ret;
 }
 static DEVICE_ATTR(setreg, S_IWUSR, NULL, hwevent_store_setreg);

 static struct attribute *hwevent_attrs[] = {
 	&dev_attr_enable.attr,
 	&dev_attr_setreg.attr,
 	NULL,
 };

 static struct attribute_group hwevent_attr_grp = {
 	.attrs = hwevent_attrs,
 };

 static const struct attribute_group *hwevent_attr_grps[] = {
 	&hwevent_attr_grp,
 	NULL,
 };

 static int __devinit hwevent_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct hwevent_drvdata *drvdata;
 	struct coresight_desc *desc;
 	struct coresight_platform_data *pdata;
 	struct resource *res;
 	int ret, i;
 	const char *hmux_name, *hclk_name;

 	if (coresight_fuse_access_disabled())
 		return -EPERM;

 	if (pdev->dev.of_node) {
 		pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 		pdev->dev.platform_data = pdata;
 	}

 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 	drvdata->dev = &pdev->dev;
 	platform_set_drvdata(pdev, drvdata);

 	if (pdev->dev.of_node)
 		drvdata->nr_hmux = of_property_count_strings(pdev->dev.of_node,
 							     "reg-names");

 	if (drvdata->nr_hmux > 0) {
 		drvdata->hmux = devm_kzalloc(dev, drvdata->nr_hmux *
 					     sizeof(*drvdata->hmux),
 					     GFP_KERNEL);
 		if (!drvdata->hmux)
 			return -ENOMEM;
 		for (i = 0; i < drvdata->nr_hmux; i++) {
 			ret = of_property_read_string_index(pdev->dev.of_node,
 							    "reg-names", i,
 							    &hmux_name);
 			if (ret)
 				return ret;
 			res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 							   hmux_name);
 			if (!res)
 				return -ENODEV;
 			drvdata->hmux[i].start = res->start;
 			drvdata->hmux[i].end = res->end;
 		}
 	} else if (drvdata->nr_hmux < 0) {
 		return drvdata->nr_hmux;
 	} else {
 		/* return error if reg-names in dt node is empty string */
 		return -ENODEV;
 	}

 	mutex_init(&drvdata->mutex);

 	drvdata->clk = devm_clk_get(dev, "core_clk");
 	if (IS_ERR(drvdata->clk))
 		return PTR_ERR(drvdata->clk);

 	ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
 	if (ret)
 		return ret;

 	if (pdev->dev.of_node)
 		drvdata->nr_hclk = of_property_count_strings(pdev->dev.of_node,
 							     "qcom,hwevent-clks");
 	if (drvdata->nr_hclk > 0) {
 		drvdata->hclk = devm_kzalloc(dev, drvdata->nr_hclk *
 					     sizeof(*drvdata->hclk),
 					     GFP_KERNEL);
 		if (!drvdata->hclk)
 			return -ENOMEM;
 		for (i = 0; i < drvdata->nr_hclk; i++) {
 			ret = of_property_read_string_index(pdev->dev.of_node,
 							    "qcom,hwevent-clks",
 							    i, &hclk_name);
 			if (ret)
 				return ret;
 			drvdata->hclk[i] = devm_clk_get(dev, hclk_name);
 			if (IS_ERR(drvdata->hclk[i]))
 				return PTR_ERR(drvdata->hclk[i]);
 		}
 	}

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

 	desc->type = CORESIGHT_DEV_TYPE_NONE;
 	desc->pdata = pdev->dev.platform_data;
 	desc->dev = &pdev->dev;
 	desc->groups = hwevent_attr_grps;
 	desc->owner = THIS_MODULE;
 	drvdata->csdev = coresight_register(desc);
 	if (IS_ERR(drvdata->csdev))
 		return PTR_ERR(drvdata->csdev);

 	dev_info(dev, "Hardware Event driver initialized\n");
 	return 0;
 }

 static int __devexit hwevent_remove(struct platform_device *pdev)
 {
 	struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev);

 	coresight_unregister(drvdata->csdev);
 	return 0;
 }

 static struct of_device_id hwevent_match[] = {
 	{.compatible = "qcom,coresight-hwevent"},
 	{}
 };

 static struct platform_driver hwevent_driver = {
 	.probe		= hwevent_probe,
 	.remove		= __devexit_p(hwevent_remove),
 	.driver		= {
 		.name	= "coresight-hwevent",
 		.owner	= THIS_MODULE,
 		.of_match_table	= hwevent_match,
 	},
 };

 static int __init hwevent_init(void)
 {
 	return platform_driver_register(&hwevent_driver);
 }
 module_init(hwevent_init);

 static void __exit hwevent_exit(void)
 {
 	platform_driver_unregister(&hwevent_driver);
 }
 module_exit(hwevent_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("CoreSight Hardware Event driver");
	/* Copyright (c) 2013, 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/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/mutex.h>
	#include <linux/clk.h>
	#include <linux/of_coresight.h>
	#include <linux/coresight.h>
	#include <linux/of.h>

	#include "coresight-priv.h"

	struct hwevent_mux {
	phys_addr_t start;
	phys_addr_t end;
	};

	struct hwevent_drvdata {
	struct device *dev;
	struct coresight_device *csdev;
	struct clk *clk;
	struct mutex mutex;
	int nr_hclk;
	struct clk **hclk;
	int nr_hmux;
	struct hwevent_mux *hmux;
	bool enable;
	};

	static int hwevent_enable(struct hwevent_drvdata *drvdata)
	{
	int ret, i;

	mutex_lock(&drvdata->mutex);

	if (drvdata->enable)
	goto out;

	ret = clk_prepare_enable(drvdata->clk);
	if (ret)
	goto err0;
	for (i = 0; i < drvdata->nr_hclk; i++) {
	ret = clk_prepare_enable(drvdata->hclk[i]);
	if (ret)
	goto err1;
	}
	drvdata->enable = true;
	dev_info(drvdata->dev, "Hardware Event driver enabled\n");
	out:
	mutex_unlock(&drvdata->mutex);
	return 0;
	err1:
	clk_disable_unprepare(drvdata->clk);
	for (i--; i >= 0; i--)
	clk_disable_unprepare(drvdata->hclk[i]);
	err0:
	mutex_unlock(&drvdata->mutex);
	return ret;
	}

	static void hwevent_disable(struct hwevent_drvdata *drvdata)
	{
	int i;

	mutex_lock(&drvdata->mutex);

	if (!drvdata->enable)
	goto out;

	drvdata->enable = false;
	clk_disable_unprepare(drvdata->clk);
	for (i = 0; i < drvdata->nr_hclk; i++)
	clk_disable_unprepare(drvdata->hclk[i]);
	dev_info(drvdata->dev, "Hardware Event driver disabled\n");
	out:
	mutex_unlock(&drvdata->mutex);
	}

	static ssize_t hwevent_show_enable(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
	unsigned long val = drvdata->enable;

	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
	}

	static ssize_t hwevent_store_enable(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
	unsigned long val;
	int ret = 0;

	if (sscanf(buf, "%lx", &val) != 1)
	return -EINVAL;

	if (val)
	ret = hwevent_enable(drvdata);
	else
	hwevent_disable(drvdata);

	if (ret)
	return ret;
	return size;
	}
	static DEVICE_ATTR(enable, S_IRUGO \| S_IWUSR, hwevent_show_enable,
	hwevent_store_enable);

	static ssize_t hwevent_store_setreg(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
	void *hwereg;
	unsigned long long addr;
	unsigned long val;
	int ret, i;

	if (sscanf(buf, "%llx %lx", &addr, &val) != 2)
	return -EINVAL;

	mutex_lock(&drvdata->mutex);

	if (!drvdata->enable) {
	dev_err(dev, "Hardware Event driver not enabled\n");
	ret = -EINVAL;
	goto err;
	}

	for (i = 0; i < drvdata->nr_hmux; i++) {
	if ((addr >= drvdata->hmux[i].start) &&
	(addr < drvdata->hmux[i].end)) {
	hwereg = devm_ioremap(dev,
	drvdata->hmux[i].start,
	drvdata->hmux[i].end -
	drvdata->hmux[i].start);
	if (!hwereg) {
	dev_err(dev, "unable to map address 0x%llx\n",
	addr);
	ret = -ENOMEM;
	goto err;
	}
	writel_relaxed(val, hwereg + addr -
	drvdata->hmux[i].start);
	/* Ensure writes to hwevent control registers
	are completed before unmapping the address
	*/
	mb();
	devm_iounmap(dev, hwereg);
	break;
	}
	}

	if (i == drvdata->nr_hmux) {
	ret = coresight_csr_hwctrl_set(addr, val);
	if (ret) {
	dev_err(dev, "invalid mux control register address\n");
	ret = -EINVAL;
	goto err;
	}
	}

	mutex_unlock(&drvdata->mutex);
	return size;
	err:
	mutex_unlock(&drvdata->mutex);
	return ret;
	}
	static DEVICE_ATTR(setreg, S_IWUSR, NULL, hwevent_store_setreg);

	static struct attribute *hwevent_attrs[] = {
	&dev_attr_enable.attr,
	&dev_attr_setreg.attr,
	NULL,
	};

	static struct attribute_group hwevent_attr_grp = {
	.attrs = hwevent_attrs,
	};

	static const struct attribute_group *hwevent_attr_grps[] = {
	&hwevent_attr_grp,
	NULL,
	};

	static int __devinit hwevent_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct hwevent_drvdata *drvdata;
	struct coresight_desc *desc;
	struct coresight_platform_data *pdata;
	struct resource *res;
	int ret, i;
	const char hmux_name, hclk_name;

	if (coresight_fuse_access_disabled())
	return -EPERM;

	if (pdev->dev.of_node) {
	pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	pdev->dev.platform_data = pdata;
	}

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;
	drvdata->dev = &pdev->dev;
	platform_set_drvdata(pdev, drvdata);

	if (pdev->dev.of_node)
	drvdata->nr_hmux = of_property_count_strings(pdev->dev.of_node,
	"reg-names");

	if (drvdata->nr_hmux > 0) {
	drvdata->hmux = devm_kzalloc(dev, drvdata->nr_hmux *
	sizeof(*drvdata->hmux),
	GFP_KERNEL);
	if (!drvdata->hmux)
	return -ENOMEM;
	for (i = 0; i < drvdata->nr_hmux; i++) {
	ret = of_property_read_string_index(pdev->dev.of_node,
	"reg-names", i,
	&hmux_name);
	if (ret)
	return ret;
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	hmux_name);
	if (!res)
	return -ENODEV;
	drvdata->hmux[i].start = res->start;
	drvdata->hmux[i].end = res->end;
	}
	} else if (drvdata->nr_hmux < 0) {
	return drvdata->nr_hmux;
	} else {
	/* return error if reg-names in dt node is empty string */
	return -ENODEV;
	}

	mutex_init(&drvdata->mutex);

	drvdata->clk = devm_clk_get(dev, "core_clk");
	if (IS_ERR(drvdata->clk))
	return PTR_ERR(drvdata->clk);

	ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
	if (ret)
	return ret;

	if (pdev->dev.of_node)
	drvdata->nr_hclk = of_property_count_strings(pdev->dev.of_node,
	"qcom,hwevent-clks");
	if (drvdata->nr_hclk > 0) {
	drvdata->hclk = devm_kzalloc(dev, drvdata->nr_hclk *
	sizeof(*drvdata->hclk),
	GFP_KERNEL);
	if (!drvdata->hclk)
	return -ENOMEM;
	for (i = 0; i < drvdata->nr_hclk; i++) {
	ret = of_property_read_string_index(pdev->dev.of_node,
	"qcom,hwevent-clks",
	i, &hclk_name);
	if (ret)
	return ret;
	drvdata->hclk[i] = devm_clk_get(dev, hclk_name);
	if (IS_ERR(drvdata->hclk[i]))
	return PTR_ERR(drvdata->hclk[i]);
	}
	}

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

	desc->type = CORESIGHT_DEV_TYPE_NONE;
	desc->pdata = pdev->dev.platform_data;
	desc->dev = &pdev->dev;
	desc->groups = hwevent_attr_grps;
	desc->owner = THIS_MODULE;
	drvdata->csdev = coresight_register(desc);
	if (IS_ERR(drvdata->csdev))
	return PTR_ERR(drvdata->csdev);

	dev_info(dev, "Hardware Event driver initialized\n");
	return 0;
	}

	static int __devexit hwevent_remove(struct platform_device *pdev)
	{
	struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev);

	coresight_unregister(drvdata->csdev);
	return 0;
	}

	static struct of_device_id hwevent_match[] = {
	{.compatible = "qcom,coresight-hwevent"},
	{}
	};

	static struct platform_driver hwevent_driver = {
	.probe = hwevent_probe,
	.remove = __devexit_p(hwevent_remove),
	.driver = {
	.name = "coresight-hwevent",
	.owner = THIS_MODULE,
	.of_match_table = hwevent_match,
	},
	};

	static int __init hwevent_init(void)
	{
	return platform_driver_register(&hwevent_driver);
	}
	module_init(hwevent_init);

	static void __exit hwevent_exit(void)
	{
	platform_driver_unregister(&hwevent_driver);
	}
	module_exit(hwevent_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("CoreSight Hardware Event driver");