diff options
| -rw-r--r-- | drivers/hwtracing/coresight/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-dummy.c | 163 | ||||
| -rw-r--r-- | include/linux/coresight.h | 1 |
4 files changed, 176 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 2b5bbfffbc4f..06f0a7594169 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -236,4 +236,15 @@ config CORESIGHT_TPDA To compile this driver as a module, choose M here: the module will be called coresight-tpda. + +config CORESIGHT_DUMMY + tristate "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. + + To compile this driver as a module, choose M here: the module will be + called coresight-dummy. endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 33bcc3f7b8ae..995d3b2c76df 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -30,3 +30,4 @@ obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \ coresight-cti-sysfs.o obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o +obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c new file mode 100644 index 000000000000..42125b7a0f39 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-dummy.c @@ -0,0 +1,163 @@ +// 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" + +struct dummy_drvdata { + struct device *dev; + struct coresight_device *csdev; +}; + +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, u32 mode) +{ + dev_dbg(csdev->dev.parent, "Dummy source enabled\n"); + + return 0; +} + +static void dummy_source_disable(struct coresight_device *csdev, + struct perf_event *event) +{ + dev_dbg(csdev->dev.parent, "Dummy source disabled\n"); +} + +static int dummy_sink_enable(struct coresight_device *csdev, u32 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, +}; + +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 }; + + 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; + } 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)) + 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.pdata = pdev->dev.platform_data; + desc.dev = &pdev->dev; + drvdata->csdev = coresight_register(&desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + pm_runtime_enable(dev); + dev_dbg(dev, "Dummy device initialized\n"); + + return 0; +} + +static int dummy_remove(struct platform_device *pdev) +{ + struct dummy_drvdata *drvdata = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + pm_runtime_disable(dev); + coresight_unregister(drvdata->csdev); + return 0; +} + +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, + }, +}; + +static int __init dummy_init(void) +{ + return platform_driver_register(&dummy_driver); +} +module_init(dummy_init); + +static void __exit dummy_exit(void) +{ + platform_driver_unregister(&dummy_driver); +} +module_exit(dummy_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("CoreSight dummy driver"); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 949aa24f46bd..bf70987240e4 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -45,6 +45,7 @@ enum coresight_dev_type { }; enum coresight_dev_subtype_sink { + CORESIGHT_DEV_SUBTYPE_SINK_DUMMY, CORESIGHT_DEV_SUBTYPE_SINK_PORT, CORESIGHT_DEV_SUBTYPE_SINK_BUFFER, CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM, |