Coresight: Add coresight TPDM source driver

Add driver to support Coresight device TPDM (Trace, Profiling and
Diagnostics Monitor). TPDM is a monitor to collect data from
different datasets. This change is to add probe/enable/disable
functions for tpdm source.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230120095301.30792-1-quic_jinlmao@quicinc.com

drivers/hwtracing/coresight/Kconfig

@@ -213,4 +213,16 @@ config ULTRASOC_SMB
 
 	  To compile this driver as a module, choose M here: the module will be
 	  called ultrasoc-smb.
+
+config CORESIGHT_TPDM
+	tristate "CoreSight Trace, Profiling & Diagnostics Monitor driver"
+	select CORESIGHT_LINKS_AND_SINKS
+	help
+	  This driver provides support for configuring monitor. Monitors are
+	  primarily responsible for data set collection and support the
+	  ability to collect any permutation of data set types.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called coresight-tpdm.
+
 endif

drivers/hwtracing/coresight/Makefile

@@ -25,6 +25,7 @@ obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o
 obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
 obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o
 obj-$(CONFIG_CORESIGHT_TRBE) += coresight-trbe.o
+obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o
 coresight-cti-y := coresight-cti-core.o	coresight-cti-platform.o \
 		   coresight-cti-sysfs.o
 obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o

drivers/hwtracing/coresight/coresight-core.c

@@ -1061,7 +1061,8 @@ static int coresight_validate_source(struct coresight_device *csdev,
 	}
 
 	if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
-	    subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) {
+	    subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE &&
+	    subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS) {
 		dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
 		return -EINVAL;
 	}
@@ -1130,6 +1131,7 @@ int coresight_enable(struct coresight_device *csdev)
 		per_cpu(tracer_path, cpu) = path;
 		break;
 	case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
+	case CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS:
 		/*
 		 * Use the hash of source's device name as ID
 		 * and map the ID to the pointer of the path.
@@ -1179,6 +1181,7 @@ void coresight_disable(struct coresight_device *csdev)
 		per_cpu(tracer_path, cpu) = NULL;
 		break;
 	case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
+	case CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS:
 		hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev)));
 		/* Find the path by the hash. */
 		path = idr_find(&path_idr, hash);

drivers/hwtracing/coresight/coresight-tpdm.c

@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/amba/bus.h>
+#include <linux/bitmap.h>
+#include <linux/coresight.h>
+#include <linux/coresight-pmu.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "coresight-priv.h"
+#include "coresight-tpdm.h"
+
+DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
+
+/* TPDM enable operations */
+static int tpdm_enable(struct coresight_device *csdev,
+		       struct perf_event *event, u32 mode)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+	spin_lock(&drvdata->spinlock);
+	if (drvdata->enable) {
+		spin_unlock(&drvdata->spinlock);
+		return -EBUSY;
+	}
+
+	drvdata->enable = true;
+	spin_unlock(&drvdata->spinlock);
+
+	dev_dbg(drvdata->dev, "TPDM tracing enabled\n");
+	return 0;
+}
+
+/* TPDM disable operations */
+static void tpdm_disable(struct coresight_device *csdev,
+			 struct perf_event *event)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+	spin_lock(&drvdata->spinlock);
+	if (!drvdata->enable) {
+		spin_unlock(&drvdata->spinlock);
+		return;
+	}
+
+	drvdata->enable = false;
+	spin_unlock(&drvdata->spinlock);
+
+	dev_dbg(drvdata->dev, "TPDM tracing disabled\n");
+}
+
+static const struct coresight_ops_source tpdm_source_ops = {
+	.enable		= tpdm_enable,
+	.disable	= tpdm_disable,
+};
+
+static const struct coresight_ops tpdm_cs_ops = {
+	.source_ops	= &tpdm_source_ops,
+};
+
+static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
+{
+	void __iomem *base;
+	struct device *dev = &adev->dev;
+	struct coresight_platform_data *pdata;
+	struct tpdm_drvdata *drvdata;
+	struct coresight_desc desc = { 0 };
+
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	adev->dev.platform_data = pdata;
+
+	/* driver data*/
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+	drvdata->dev = &adev->dev;
+	dev_set_drvdata(dev, drvdata);
+
+	base = devm_ioremap_resource(dev, &adev->res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	drvdata->base = base;
+
+	/* Set up coresight component description */
+	desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
+	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
+	desc.ops = &tpdm_cs_ops;
+	desc.pdata = adev->dev.platform_data;
+	desc.dev = &adev->dev;
+	desc.access = CSDEV_ACCESS_IOMEM(base);
+	drvdata->csdev = coresight_register(&desc);
+	if (IS_ERR(drvdata->csdev))
+		return PTR_ERR(drvdata->csdev);
+
+	spin_lock_init(&drvdata->spinlock);
+	/* Decrease pm refcount when probe is done.*/
+	pm_runtime_put(&adev->dev);
+
+	return 0;
+}
+
+static void __exit tpdm_remove(struct amba_device *adev)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+
+	coresight_unregister(drvdata->csdev);
+}
+
+/*
+ * Different TPDM has different periph id.
+ * The difference is 0-7 bits' value. So ignore 0-7 bits.
+ */
+static struct amba_id tpdm_ids[] = {
+	{
+		.id = 0x000f0e00,
+		.mask = 0x000fff00,
+	},
+	{ 0, 0},
+};
+
+static struct amba_driver tpdm_driver = {
+	.drv = {
+		.name   = "coresight-tpdm",
+		.owner	= THIS_MODULE,
+		.suppress_bind_attrs = true,
+	},
+	.probe          = tpdm_probe,
+	.id_table	= tpdm_ids,
+	.remove		= tpdm_remove,
+};
+
+module_amba_driver(tpdm_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Monitor driver");

drivers/hwtracing/coresight/coresight-tpdm.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _CORESIGHT_CORESIGHT_TPDM_H
+#define _CORESIGHT_CORESIGHT_TPDM_H
+
+/**
+ * struct tpdm_drvdata - specifics associated to an TPDM component
+ * @base:       memory mapped base address for this component.
+ * @dev:        The device entity associated to this component.
+ * @csdev:      component vitals needed by the framework.
+ * @spinlock:   lock for the drvdata value.
+ * @enable:     enable status of the component.
+ */
+
+struct tpdm_drvdata {
+	void __iomem		*base;
+	struct device		*dev;
+	struct coresight_device	*csdev;
+	spinlock_t		spinlock;
+	bool			enable;
+};
+
+#endif  /* _CORESIGHT_CORESIGHT_TPDM_H */

include/linux/coresight.h

@@ -61,6 +61,7 @@ enum coresight_dev_subtype_source {
 	CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
 	CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
 	CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
+	CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS,
 };
 
 enum coresight_dev_subtype_helper {