Add driver to support Coresight device TGU (Trigger Generation Unit).
TGU is a Data Engine which can be utilized to sense a plurality of
signals and create a trigger into the CTI or generate interrupts to
processors. Add probe/enable/disable functions for tgu.
Signed-off-by: songchai <quic_songchai@xxxxxxxxxxx>
---
.../testing/sysfs-bus-coresight-devices-tgu | 9 +
drivers/hwtracing/coresight/Kconfig | 11 +
drivers/hwtracing/coresight/Makefile | 1 +
drivers/hwtracing/coresight/coresight-tgu.c | 211 ++++++++++++++++++
drivers/hwtracing/coresight/coresight-tgu.h | 36 +++
5 files changed, 268 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu
create mode 100644 drivers/hwtracing/coresight/coresight-tgu.c
create mode 100644 drivers/hwtracing/coresight/coresight-tgu.h
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu
new file mode 100644
index 000000000000..ee976b67ff01
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu
@@ -0,0 +1,9 @@
+What: /sys/bus/coresight/devices/<tgu-name>/enable_tgu
+Date: August 2024
+KernelVersion 6.10
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Sam Chai (QUIC) <quic_songchai@xxxxxxxxxxx>
+Description:
+ (RW) Set/Get the enable/disable status of TGU
+ Accepts only one of the 2 values - 0 or 1.
+ 0 : disable TGU.
+ 1 : enable TGU.
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index 06f0a7594169..3fe59c745dd4 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -247,4 +247,15 @@ config CORESIGHT_DUMMY
To compile this driver as a module, choose M here: the module will be
called coresight-dummy.
+
+config CORESIGHT_TGU
+ tristate "CoreSight Trigger Generation Unit driver"
+ help
+ This driver provides support for Trigger Generation Unit that is
+ used to detect patterns or sequences on a given set of signals.
+ TGU is used to monitor a particular bus within a given region to
+ detect illegal transaction sequences or slave responses. It is also
+ used to monitor a data stream to detect protocol violations and to
+ provide a trigger point for centering data around a specific event
+ within the trace data buffer.
endif
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 4ba478211b31..7c2b9e9cf1cd 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -51,3 +51,4 @@ 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
+obj-$(CONFIG_CORESIGHT_TGU) += coresight-tgu.o
diff --git a/drivers/hwtracing/coresight/coresight-tgu.c b/drivers/hwtracing/coresight/coresight-tgu.c
new file mode 100644
index 000000000000..278dd69ee93d
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-tgu.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/amba/bus.h>
+#include <linux/coresight.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "coresight-priv.h"
+#include "coresight-tgu.h"
+
+DEFINE_CORESIGHT_DEVLIST(tgu_devs, "tgu");
+
+static void tgu_write_all_hw_regs(struct tgu_drvdata *drvdata)
+{
+ CS_UNLOCK(drvdata->base);
+ /* Enable TGU to program the triggers */
+ tgu_writel(drvdata, 1, TGU_CONTROL);
+ CS_LOCK(drvdata->base);
+}
+
+static int tgu_enable(struct coresight_device *csdev, enum cs_mode mode,
+ void *data)
+{
+ struct tgu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ spin_lock(&drvdata->spinlock);
+
+ if (drvdata->enable) {
+ spin_unlock(&drvdata->spinlock);
+ return -EBUSY;
+ }
+ tgu_write_all_hw_regs(drvdata);
+ drvdata->enable = true;
+
+ spin_unlock(&drvdata->spinlock);
+ return 0;
+}
+
+static int tgu_disable(struct coresight_device *csdev, void *data)
+{
+ struct tgu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ spin_lock(&drvdata->spinlock);
+
+ if (!drvdata->enable) {
+ spin_unlock(&drvdata->spinlock);
+ return 0;
+ }
+
+ CS_UNLOCK(drvdata->base);
+ tgu_writel(drvdata, 0, TGU_CONTROL);
+ CS_LOCK(drvdata->base);
+
+ drvdata->enable = false;
+ spin_unlock(&drvdata->spinlock);
+ return 0;
+}
+
+static ssize_t enable_tgu_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ bool enabled;
+
+ struct tgu_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ spin_lock(&drvdata->spinlock);
+ enabled = drvdata->enable;
+ spin_unlock(&drvdata->spinlock);
+
+ return sprintf(buf, "%d\n", enabled);
+}
+
+/* enable_tgu_store - Configure Trace and Gating Unit (TGU) triggers. */
+static ssize_t enable_tgu_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t size)
+{
+ int ret = 0;
+ unsigned long val;
+ struct tgu_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val) {
+ ret = pm_runtime_resume_and_get(dev->parent);
+ if (ret)
+ return ret;
+ ret = tgu_enable(drvdata->csdev, CS_MODE_SYSFS, NULL);
+ if (ret)
+ pm_runtime_put(dev->parent);
+ } else {
+ ret = tgu_disable(drvdata->csdev, NULL);
+ if (!ret)
+ pm_runtime_put(dev->parent);
+ }
+
+ if (ret)
+ return ret;
+ return size;
+}
+static DEVICE_ATTR_RW(enable_tgu);
+
+static const struct coresight_ops_helper tgu_helper_ops = {
+ .enable = tgu_enable,
+ .disable = tgu_disable,
+};
+
+static const struct coresight_ops tgu_ops = {
+ .helper_ops = &tgu_helper_ops,
+};
+
+static struct attribute *tgu_common_attrs[] = {
+ &dev_attr_enable_tgu.attr,
+ NULL,
+};
+
+static struct attribute_group tgu_common_grp = {
+ .attrs = tgu_common_attrs,
+ NULL,
+};
+
+static const struct attribute_group *tgu_attr_groups[] = {
+ &tgu_common_grp,
+ NULL,
+};
+
+static int tgu_probe(struct amba_device *adev, const struct amba_id *id)
+{
+ int ret = 0;
+ struct device *dev = &adev->dev;
+ struct coresight_platform_data *pdata;
+ struct tgu_drvdata *drvdata;
+ struct coresight_desc desc = { 0 };
+
+ desc.name = coresight_alloc_device_name(&tgu_devs, dev);
+ if (!desc.name)
+ return -ENOMEM;
+
+ pdata = coresight_get_platform_data(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+
+ adev->dev.platform_data = pdata;
+
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->dev = &adev->dev;
+ dev_set_drvdata(dev, drvdata);
+
+ drvdata->base = devm_ioremap_resource(dev, &adev->res);
+ if (!drvdata->base)
+ return -ENOMEM;
+
+ spin_lock_init(&drvdata->spinlock);
+
+ drvdata->enable = false;
+ desc.type = CORESIGHT_DEV_TYPE_HELPER;
+ desc.pdata = adev->dev.platform_data;
+ desc.dev = &adev->dev;
+ desc.ops = &tgu_ops;
+ desc.groups = tgu_attr_groups;
+
+ drvdata->csdev = coresight_register(&desc);
+ if (IS_ERR(drvdata->csdev)) {
+ ret = PTR_ERR(drvdata->csdev);
+ goto err;
+ }
+
+ pm_runtime_put(&adev->dev);
+ dev_dbg(dev, "TGU initialized\n");
+ return 0;
+err:
+ pm_runtime_put(&adev->dev);
+ return ret;
+}
+
+static struct amba_id tgu_ids[] = {
+ {
+ .id = 0x0003b999,
+ .mask = 0x0003ffff,
+ .data = "TGU",
+ },
+ { 0, 0 },
+};
+
+static struct amba_driver tgu_driver = {
+ .drv = {
+ .name = "coresight-tgu",
+ .owner = THIS_MODULE,
+ .suppress_bind_attrs = true,
+ },
+ .probe = tgu_probe,
+ .id_table = tgu_ids,
+};
+
+module_amba_driver(tgu_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CoreSight TGU driver");
+
diff --git a/drivers/hwtracing/coresight/coresight-tgu.h b/drivers/hwtracing/coresight/coresight-tgu.h
new file mode 100644
index 000000000000..6e793421066b
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-tgu.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _CORESIGHT_TGU_H
+#define _CORESIGHT_TGU_H
+
+/* Register addresses */
+#define TGU_CONTROL 0x0000
+
+/* Register read/write */
+#define tgu_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
+#define tgu_readl(drvdata, off) __raw_readl(drvdata->base + off)
+
+/**
+ * struct tgu_drvdata - Data structure for a TGU (Trigger Generator Unit) device
+ * @base: Memory-mapped base address of the TGU device
+ * @dev: Pointer to the associated device structure
+ * @csdev: Pointer to the associated coresight device
+ * @spinlock: Spinlock for handling concurrent access
+ * @enable: Flag indicating whether the TGU device is enabled
+ *
+ * This structure defines the data associated with a TGU device, including its base
+ * address, device pointers, clock, spinlock for synchronization, trigger data pointers,
+ * maximum limits for various trigger-related parameters, and enable status.
+ */
+struct tgu_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ spinlock_t spinlock;
+ bool enable;
+};
+
+#endif
