Merge "coresight-dummy: add dummy driver support for source devices" into msm-4.9 (9ad8c85c) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/hwtracing/coresight/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -149,4 +149,12 @@ 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
		@@ -22,3 +22,4 @@ obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o
		obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o
		obj-$(CONFIG_CORESIGHT_CSR) += coresight-csr.o
		obj-$(CONFIG_CORESIGHT_HWEVENT) += coresight-hwevent.o
		obj-$(CONFIG_CORESIGHT_SOURCE_DUMMY) += coresight-dummy.o

drivers/hwtracing/coresight/coresight-dummy.c

0 → 100644

+137 −0

Original line number	Diff line number	Diff line
		/* Copyright (c) 2016-2017, 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/platform_device.h>
		#include <linux/coresight.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_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 dummy_cs_ops = {
		.source_ops = &dummy_source_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++;

		desc->type = CORESIGHT_DEV_TYPE_SOURCE;
		desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
		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",
		.owner = THIS_MODULE,
		.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");