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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.4 */5 6#include <linux/coresight.h>7#include <linux/kernel.h>8#include <linux/module.h>9#include <linux/of.h>10#include <linux/platform_device.h>11#include <linux/pm_runtime.h>12 13#include "coresight-priv.h"14 15struct dummy_drvdata {16 struct device *dev;17 struct coresight_device *csdev;18};19 20DEFINE_CORESIGHT_DEVLIST(source_devs, "dummy_source");21DEFINE_CORESIGHT_DEVLIST(sink_devs, "dummy_sink");22 23static int dummy_source_enable(struct coresight_device *csdev,24 struct perf_event *event, enum cs_mode mode,25 __maybe_unused struct coresight_trace_id_map *id_map)26{27 if (!coresight_take_mode(csdev, mode))28 return -EBUSY;29 30 dev_dbg(csdev->dev.parent, "Dummy source enabled\n");31 32 return 0;33}34 35static void dummy_source_disable(struct coresight_device *csdev,36 struct perf_event *event)37{38 coresight_set_mode(csdev, CS_MODE_DISABLED);39 dev_dbg(csdev->dev.parent, "Dummy source disabled\n");40}41 42static int dummy_sink_enable(struct coresight_device *csdev, enum cs_mode mode,43 void *data)44{45 dev_dbg(csdev->dev.parent, "Dummy sink enabled\n");46 47 return 0;48}49 50static int dummy_sink_disable(struct coresight_device *csdev)51{52 dev_dbg(csdev->dev.parent, "Dummy sink disabled\n");53 54 return 0;55}56 57static const struct coresight_ops_source dummy_source_ops = {58 .enable = dummy_source_enable,59 .disable = dummy_source_disable,60};61 62static const struct coresight_ops dummy_source_cs_ops = {63 .source_ops = &dummy_source_ops,64};65 66static const struct coresight_ops_sink dummy_sink_ops = {67 .enable = dummy_sink_enable,68 .disable = dummy_sink_disable,69};70 71static const struct coresight_ops dummy_sink_cs_ops = {72 .sink_ops = &dummy_sink_ops,73};74 75static int dummy_probe(struct platform_device *pdev)76{77 struct device *dev = &pdev->dev;78 struct device_node *node = dev->of_node;79 struct coresight_platform_data *pdata;80 struct dummy_drvdata *drvdata;81 struct coresight_desc desc = { 0 };82 83 if (of_device_is_compatible(node, "arm,coresight-dummy-source")) {84 85 desc.name = coresight_alloc_device_name(&source_devs, dev);86 if (!desc.name)87 return -ENOMEM;88 89 desc.type = CORESIGHT_DEV_TYPE_SOURCE;90 desc.subtype.source_subtype =91 CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;92 desc.ops = &dummy_source_cs_ops;93 } else if (of_device_is_compatible(node, "arm,coresight-dummy-sink")) {94 desc.name = coresight_alloc_device_name(&sink_devs, dev);95 if (!desc.name)96 return -ENOMEM;97 98 desc.type = CORESIGHT_DEV_TYPE_SINK;99 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_DUMMY;100 desc.ops = &dummy_sink_cs_ops;101 } else {102 dev_err(dev, "Device type not set\n");103 return -EINVAL;104 }105 106 pdata = coresight_get_platform_data(dev);107 if (IS_ERR(pdata))108 return PTR_ERR(pdata);109 pdev->dev.platform_data = pdata;110 111 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);112 if (!drvdata)113 return -ENOMEM;114 115 drvdata->dev = &pdev->dev;116 platform_set_drvdata(pdev, drvdata);117 118 desc.pdata = pdev->dev.platform_data;119 desc.dev = &pdev->dev;120 drvdata->csdev = coresight_register(&desc);121 if (IS_ERR(drvdata->csdev))122 return PTR_ERR(drvdata->csdev);123 124 pm_runtime_enable(dev);125 dev_dbg(dev, "Dummy device initialized\n");126 127 return 0;128}129 130static void dummy_remove(struct platform_device *pdev)131{132 struct dummy_drvdata *drvdata = platform_get_drvdata(pdev);133 struct device *dev = &pdev->dev;134 135 pm_runtime_disable(dev);136 coresight_unregister(drvdata->csdev);137}138 139static const struct of_device_id dummy_match[] = {140 {.compatible = "arm,coresight-dummy-source"},141 {.compatible = "arm,coresight-dummy-sink"},142 {},143};144 145static struct platform_driver dummy_driver = {146 .probe = dummy_probe,147 .remove_new = dummy_remove,148 .driver = {149 .name = "coresight-dummy",150 .of_match_table = dummy_match,151 },152};153 154module_platform_driver(dummy_driver);155 156MODULE_LICENSE("GPL");157MODULE_DESCRIPTION("CoreSight dummy driver");158