Merge "coresight: Add snapshot of Coresight dummy driver" (7b03e7d3) · Commits · e / devices / android_kernel_fairphone_FP5

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");