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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/coresight.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "coresight-priv.h"
#include "coresight-trace-id.h"
struct dummy_drvdata {
struct device *dev;
struct coresight_device *csdev;
u8 traceid;
};
DEFINE_CORESIGHT_DEVLIST(source_devs, "dummy_source");
DEFINE_CORESIGHT_DEVLIST(sink_devs, "dummy_sink");
static int dummy_source_enable(struct coresight_device *csdev,
struct perf_event *event, enum cs_mode mode,
__maybe_unused struct coresight_trace_id_map *id_map)
{
if (!coresight_take_mode(csdev, mode))
return -EBUSY;
dev_dbg(csdev->dev.parent, "Dummy source enabled\n");
return 0;
}
static void dummy_source_disable(struct coresight_device *csdev,
struct perf_event *event)
{
coresight_set_mode(csdev, CS_MODE_DISABLED);
dev_dbg(csdev->dev.parent, "Dummy source disabled\n");
}
static int dummy_sink_enable(struct coresight_device *csdev, enum cs_mode mode,
void *data)
{
dev_dbg(csdev->dev.parent, "Dummy sink enabled\n");
return 0;
}
static int dummy_sink_disable(struct coresight_device *csdev)
{
dev_dbg(csdev->dev.parent, "Dummy sink disabled\n");
return 0;
}
static const struct coresight_ops_source dummy_source_ops = {
.enable = dummy_source_enable,
.disable = dummy_source_disable,
};
static const struct coresight_ops dummy_source_cs_ops = {
.source_ops = &dummy_source_ops,
};
static const struct coresight_ops_sink dummy_sink_ops = {
.enable = dummy_sink_enable,
.disable = dummy_sink_disable,
};
static const struct coresight_ops dummy_sink_cs_ops = {
.sink_ops = &dummy_sink_ops,
};
/* User can get the trace id of dummy source from this node. */
static ssize_t traceid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long val;
struct dummy_drvdata *drvdata = dev_get_drvdata(dev->parent);
val = drvdata->traceid;
return sysfs_emit(buf, "%#lx\n", val);
}
static DEVICE_ATTR_RO(traceid);
static struct attribute *coresight_dummy_attrs[] = {
&dev_attr_traceid.attr,
NULL,
};
static const struct attribute_group coresight_dummy_group = {
.attrs = coresight_dummy_attrs,
};
static const struct attribute_group *coresight_dummy_groups[] = {
&coresight_dummy_group,
NULL,
};
static int dummy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct coresight_platform_data *pdata;
struct dummy_drvdata *drvdata;
struct coresight_desc desc = { 0 };
int ret = 0, trace_id = 0;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
if (of_device_is_compatible(node, "arm,coresight-dummy-source")) {
desc.name = coresight_alloc_device_name(&source_devs, dev);
if (!desc.name)
return -ENOMEM;
desc.type = CORESIGHT_DEV_TYPE_SOURCE;
desc.subtype.source_subtype =
CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
desc.ops = &dummy_source_cs_ops;
desc.groups = coresight_dummy_groups;
ret = coresight_get_static_trace_id(dev, &trace_id);
if (!ret) {
/* Get the static id if id is set in device tree. */
ret = coresight_trace_id_get_static_system_id(trace_id);
if (ret < 0) {
dev_err(dev, "Fail to get static id.\n");
return ret;
}
} else {
/* Get next available id if id is not set in device tree. */
trace_id = coresight_trace_id_get_system_id();
if (trace_id < 0) {
ret = trace_id;
return ret;
}
}
drvdata->traceid = (u8)trace_id;
} else if (of_device_is_compatible(node, "arm,coresight-dummy-sink")) {
desc.name = coresight_alloc_device_name(&sink_devs, dev);
if (!desc.name)
return -ENOMEM;
desc.type = CORESIGHT_DEV_TYPE_SINK;
desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_DUMMY;
desc.ops = &dummy_sink_cs_ops;
} else {
dev_err(dev, "Device type not set\n");
return -EINVAL;
}
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);
goto free_id;
}
pdev->dev.platform_data = pdata;
drvdata->dev = &pdev->dev;
platform_set_drvdata(pdev, drvdata);
desc.pdata = pdev->dev.platform_data;
desc.dev = &pdev->dev;
drvdata->csdev = coresight_register(&desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto free_id;
}
pm_runtime_enable(dev);
dev_dbg(dev, "Dummy device initialized\n");
ret = 0;
goto out;
free_id:
if (IS_VALID_CS_TRACE_ID(drvdata->traceid))
coresight_trace_id_put_system_id(drvdata->traceid);
out:
return ret;
}
static void dummy_remove(struct platform_device *pdev)
{
struct dummy_drvdata *drvdata = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
if (IS_VALID_CS_TRACE_ID(drvdata->traceid))
coresight_trace_id_put_system_id(drvdata->traceid);
pm_runtime_disable(dev);
coresight_unregister(drvdata->csdev);
}
static const struct of_device_id dummy_match[] = {
{.compatible = "arm,coresight-dummy-source"},
{.compatible = "arm,coresight-dummy-sink"},
{},
};
static struct platform_driver dummy_driver = {
.probe = dummy_probe,
.remove = dummy_remove,
.driver = {
.name = "coresight-dummy",
.of_match_table = dummy_match,
},
};
module_platform_driver(dummy_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CoreSight dummy driver");
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