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Commit 25808afa authored by Rama Aparna Mallavarapu's avatar Rama Aparna Mallavarapu Committed by Mulu He
Browse files

coresight: dummy: Add snapshot of Coresight Dummy 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: I5f034574205584c6b6c044961bdf60f9348b567e
Signed-off-by: default avatarRama Aparna Mallavarapu <aparnam@codeaurora.org>
Signed-off-by: default avatarMulu He <muluhe@codeaurora.org>
parent 1a98b583

drivers/hwtracing/coresight/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -177,4 +177,12 @@ config CORESIGHT_HWEVENT 
	  Hardware Event across STM interface. It configures Coresight

	  Hardware Event mux control registers to select hardware events

	  based on user input.



config CORESIGHT_DUMMY

	bool "Dummy driver support"

	help

	  Enables support for dummy driver. Dummy driver can be	used for

	  CoreSight sources/sinks that are owned and configured by some

	  other subsystem and use Linux drivers to configure rest of trace

	  path.

endif

drivers/hwtracing/coresight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,3 +25,4 @@ 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

obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o

drivers/hwtracing/coresight/coresight-dummy.c

0 → 100644
+163 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/coresight.h>

#include <linux/of.h>



#define DUMMY_TRACE_ID_START	256



struct dummy_drvdata {

	struct device			*dev;

	struct coresight_device		*csdev;

	int				traceid;

};



static int dummy_source_enable(struct coresight_device *csdev,

			       struct perf_event *event, u32 mode)

{

	struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	dev_info(drvdata->dev, "Dummy source enabled\n");



	return 0;

}



static void dummy_source_disable(struct coresight_device *csdev,

				 struct perf_event *event)

{

	struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	dev_info(drvdata->dev, "Dummy source disabled\n");

}



static int dummy_sink_enable(struct coresight_device *csdev, u32 mode)

{

	struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	dev_info(drvdata->dev, "Dummy sink enabled\n");



	return 0;

}



static void dummy_sink_disable(struct coresight_device *csdev)

{

	struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	dev_info(drvdata->dev, "Dummy sink disabled\n");

}



static int dummy_trace_id(struct coresight_device *csdev)

{

	struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);



	return drvdata->traceid;

}



static const struct coresight_ops_source dummy_source_ops = {

	.trace_id	= dummy_trace_id,

	.enable		= dummy_source_enable,

	.disable	= dummy_source_disable,

};



static const struct coresight_ops_sink dummy_sink_ops = {

	.enable		= dummy_sink_enable,

	.disable	= dummy_sink_disable,

};



static const struct coresight_ops dummy_cs_ops = {

	.source_ops	= &dummy_source_ops,

	.sink_ops	= &dummy_sink_ops,

};



static int dummy_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct coresight_platform_data *pdata;

	struct dummy_drvdata *drvdata;

	struct coresight_desc *desc;

	static int traceid = DUMMY_TRACE_ID_START;



	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);



	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);

	if (!desc)

		return -ENOMEM;



	drvdata->traceid = traceid++;



	if (of_property_read_bool(pdev->dev.of_node, "qcom,dummy-source")) {

		desc->type = CORESIGHT_DEV_TYPE_SOURCE;

		desc->subtype.source_subtype =

					CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;

	} else if (of_property_read_bool(pdev->dev.of_node,

					 "qcom,dummy-sink")) {

		desc->type = CORESIGHT_DEV_TYPE_SINK;

		desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;

	} else {

		dev_info(dev, "Device type not set.\n");

		return -EINVAL;

	}



	desc->ops = &dummy_cs_ops;

	desc->pdata = pdev->dev.platform_data;

	desc->dev = &pdev->dev;

	drvdata->csdev = coresight_register(desc);

	if (IS_ERR(drvdata->csdev))

		return PTR_ERR(drvdata->csdev);



	dev_info(dev, "Dummy device initialized\n");



	return 0;

}



static int dummy_remove(struct platform_device *pdev)

{

	struct dummy_drvdata *drvdata = platform_get_drvdata(pdev);



	coresight_unregister(drvdata->csdev);

	return 0;

}



static const struct of_device_id dummy_match[] = {

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

	{}

};



static struct platform_driver dummy_driver = {

	.probe	= dummy_probe,

	.remove	= dummy_remove,

	.driver	= {

		.name   = "coresight-dummy",

		.of_match_table = dummy_match,

	},

};



int __init dummy_init(void)

{

	return platform_driver_register(&dummy_driver);

}

module_init(dummy_init);



void __exit dummy_exit(void)

{

	platform_driver_unregister(&dummy_driver);

}

module_exit(dummy_exit);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("CoreSight dummy source driver");