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Commit 9345684c authored by Rama Aparna Mallavarapu's avatar Rama Aparna Mallavarapu Committed by Gerrit - the friendly Code Review server
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coresight: hwevent: Add snapshot of Coresight HWEVENT driver 



This is a snapshot of the coresight-cti driver as of msm-4.14
commit '7d42028b99d32ad6ec82aa429378fba0280a1c4a'.byte-cntr: Read 64bit rwp
TMC RWP has two 32bit registers which combine to one 64bit register.
Read correct RWP register in byte counter driver.

Change-Id: Ia5bf274e6b4da1f9825695f1bedf47d859d6a101
Signed-off-by: default avatarRama Aparna Mallavarapu <aparnam@codeaurora.org>
Signed-off-by: default avatarMulu He <muluhe@codeaurora.org>
parent 2e8f0020

drivers/hwtracing/coresight/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -167,4 +167,14 @@ config CORESIGHT_CSR 
	  that hosts miscellaneous configuration registers.

	  Those configuration registers can be used to control, various

	  coresight configurations.



config CORESIGHT_HWEVENT

	bool "CoreSight Hardware Event driver"

	depends on CORESIGHT_STM

	select CORESIGHT_CSR

	help

	  This driver provides support for monitoring and tracing CoreSight

	  Hardware Event across STM interface. It configures Coresight

	  Hardware Event mux control registers to select hardware events

	  based on user input.

endif

drivers/hwtracing/coresight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,3 +24,4 @@ obj-$(CONFIG_CORESIGHT_OST) += coresight-ost.o 
obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o

obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o

obj-$(CONFIG_CORESIGHT_CSR) += coresight-csr.o

obj-$(CONFIG_CORESIGHT_HWEVENT) += coresight-hwevent.o

drivers/hwtracing/coresight/coresight-hwevent.c

0 → 100644
+351 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.

 */



#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/coresight.h>

#include <linux/of.h>

#include <linux/regulator/consumer.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_hreg;

	struct regulator			**hreg;

	int					nr_hmux;

	struct hwevent_mux			*hmux;

	struct coresight_csr			*csr;

	const char				*csr_name;

};



static int hwevent_enable(struct hwevent_drvdata *drvdata)

{

	int ret, i, j;



	ret = clk_prepare_enable(drvdata->clk);

	if (ret)

		return ret;



	for (i = 0; i < drvdata->nr_hreg; i++) {

		ret = regulator_enable(drvdata->hreg[i]);

		if (ret)

			goto err0;

	}



	for (j = 0; j < drvdata->nr_hclk; j++) {

		ret = clk_prepare_enable(drvdata->hclk[j]);

		if (ret)

			goto err1;

	}

	return 0;

err1:

	for (j--; j >= 0; j--)

		clk_disable_unprepare(drvdata->hclk[j]);

err0:

	for (i--; i >= 0; i--)

		regulator_disable(drvdata->hreg[i]);



	clk_disable_unprepare(drvdata->clk);

	return ret;

}



static void hwevent_disable(struct hwevent_drvdata *drvdata)

{

	int i;



	clk_disable_unprepare(drvdata->clk);

	for (i = 0; i < drvdata->nr_hclk; i++)

		clk_disable_unprepare(drvdata->hclk[i]);

	for (i = 0; i < drvdata->nr_hreg; i++)

		regulator_disable(drvdata->hreg[i]);

}



static ssize_t setreg_store(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);

	ret = hwevent_enable(drvdata);

	if (ret) {

		mutex_unlock(&drvdata->mutex);

		return ret;

	}



	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(drvdata->csr, addr,  val);

		if (ret) {

			dev_err(dev, "invalid mux control register address\n");

			ret = -EINVAL;

			goto err;

		}

	}



	hwevent_disable(drvdata);

	mutex_unlock(&drvdata->mutex);

	return size;

err:

	hwevent_disable(drvdata);

	mutex_unlock(&drvdata->mutex);

	return ret;

}

static DEVICE_ATTR_WO(setreg);



static struct attribute *hwevent_attrs[] = {

	&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 hwevent_init_hmux(struct hwevent_drvdata *drvdata,

				struct platform_device *pdev)

{

	int ret, i;

	struct resource *res;

	const char *hmux_name;

	struct device_node *node = drvdata->dev->of_node;



	drvdata->nr_hmux = of_property_count_strings(node,

						     "reg-names");



	if (!drvdata->nr_hmux)

		return -ENODEV;



	if (drvdata->nr_hmux > 0) {

		drvdata->hmux = devm_kzalloc(drvdata->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(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 {

		return drvdata->nr_hmux;

	}



	return 0;

}



static int hwevent_init_clk(struct hwevent_drvdata *drvdata)

{

	int ret, i;

	const char *hclk_name, *hreg_name;

	struct device_node *node = drvdata->dev->of_node;



	drvdata->nr_hclk = of_property_count_strings(node,

						     "qcom,hwevent-clks");

	drvdata->nr_hreg = of_property_count_strings(node,

						     "qcom,hwevent-regs");



	if (drvdata->nr_hclk > 0) {

		drvdata->hclk = devm_kzalloc(drvdata->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(node,

							    "qcom,hwevent-clks",

							    i, &hclk_name);

			if (ret)

				return ret;



			drvdata->hclk[i] = devm_clk_get(drvdata->dev,

							hclk_name);

			if (IS_ERR(drvdata->hclk[i]))

				return PTR_ERR(drvdata->hclk[i]);

		}

	}

	if (drvdata->nr_hreg > 0) {

		drvdata->hreg = devm_kzalloc(drvdata->dev, drvdata->nr_hreg *

					     sizeof(*drvdata->hreg),

					     GFP_KERNEL);

		if (!drvdata->hreg)

			return -ENOMEM;



		for (i = 0; i < drvdata->nr_hreg; i++) {

			ret = of_property_read_string_index(node,

							    "qcom,hwevent-regs",

							    i, &hreg_name);

			if (ret)

				return ret;



			drvdata->hreg[i] = devm_regulator_get(drvdata->dev,

								hreg_name);

			if (IS_ERR(drvdata->hreg[i]))

				return PTR_ERR(drvdata->hreg[i]);

		}

	}



	return 0;

}



static int hwevent_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct hwevent_drvdata *drvdata;

	struct coresight_desc *desc;

	struct coresight_platform_data *pdata;

	int ret;



	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);

	mutex_init(&drvdata->mutex);



	ret = of_get_coresight_csr_name(dev->of_node, &drvdata->csr_name);

	if (ret)

		dev_err(dev, "No csr data\n");

	else {

		drvdata->csr = coresight_csr_get(drvdata->csr_name);

		if (IS_ERR(drvdata->csr)) {

			dev_dbg(dev, "failed to get csr, defer probe\n");

			return -EPROBE_DEFER;

		}

	}



	drvdata->clk = devm_clk_get(dev, "apb_pclk");

	if (IS_ERR(drvdata->clk))

		return PTR_ERR(drvdata->clk);



	ret = hwevent_init_hmux(drvdata, pdev);

	if (ret)

		return ret;



	ret = hwevent_init_clk(drvdata);

	if (ret)

		return ret;



	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;

	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 hwevent_remove(struct platform_device *pdev)

{

	struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev);



	coresight_unregister(drvdata->csdev);

	return 0;

}



static const struct of_device_id hwevent_match[] = {

	{.compatible = "qcom,coresight-hwevent"},

	{}

};



static struct platform_driver hwevent_driver = {

	.probe		= hwevent_probe,

	.remove		= hwevent_remove,

	.driver		= {

		.name	= "coresight-hwevent",

		.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");