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Commit 63fc6f1d authored by Tingwei Zhang's avatar Tingwei Zhang
Browse files

coresight: Add snapshot of Coresight dummy driver 



Add snapshot for coresight dummy driver from msm-4.19
commit 64be469bda3ae ("power: smb1390-psy: Configure IREV
and main's ICL to prevent IREV condition").
Make necessary change to adopt coresight framework change.

Change-Id: I4c40a64604dc7adc0c9a2c9f9db9ec74232702a2
Signed-off-by: default avatarTingwei Zhang <tingwei@codeaurora.org>
parent 0d543b06

drivers/hwtracing/coresight/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -145,6 +145,14 @@ config CORESIGHT_CSR 
	  Those configuration registers can be used to control, various

	  coresight configurations.



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.



config CORESIGHT_TGU

	bool "CoreSight Trigger Generation Unit driver"

	help

drivers/hwtracing/coresight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -19,5 +19,6 @@ obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o 
obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o

obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o

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

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

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

obj-$(CONFIG_CORESIGHT_TGU) += coresight-tgu.o

drivers/hwtracing/coresight/coresight-dummy.c

0 → 100644
+167 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2016-2017, 2019 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;

};



DEFINE_CORESIGHT_DEVLIST(dummy_devs, "dummy");



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,

				void *data)

{

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



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



	return 0;

}



static int 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");



	return 0;

}



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 = { 0 };

	static int traceid = DUMMY_TRACE_ID_START;



	desc.name = coresight_alloc_device_name(&dummy_devs, dev);

	if (!desc.name)

		return -ENOMEM;

	pdata = coresight_get_platform_data(dev);

	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);



	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");