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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2b1707d76aasm9459111eec.33.2026.01.08.18.12.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jan 2026 18:12:06 -0800 (PST) From: Songwei Chai To: andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, suzuki.poulose@arm.com, james.clark@arm.com, krzk+dt@kernel.org, conor+dt@kernel.org Cc: Songwei Chai , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org Subject: [PATCH v10 2/7] qcom-tgu: Add TGU driver Date: Thu, 8 Jan 2026 18:11:36 -0800 Message-Id: <20260109021141.3778421-3-songwei.chai@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260109021141.3778421-1-songwei.chai@oss.qualcomm.com> References: <20260109021141.3778421-1-songwei.chai@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA5MDAxMiBTYWx0ZWRfX24NMbFyy8eph Sbm52PclTDgRTmGDNRv+LzQTfgBKsP6XnnIziT/ZcvS3JyrVvde0lWKRWCN51N46cTeBgRscUdb dYEkZ9zgzF0PP4DVeryk7pwdpbKmH8wwiF4f1aUEstlrtU+0RE+Bmh3mHjEgIljGKD04ULPrPwf k12QxGQaky9GDp/XK5BZ3VNKJSlPFvlYWLinjR05JwDvQ8/DKHXSK+0bxQGIufOYp9ifu20qW4t gwGyQDZywddBV5gJ6BcXFFLsKX6scngs23y/VhYSaXcQ9kYm2CTEAvh0mhlvNPWcAu2v4h2okhl KIFEvtrkW8toFwQajtzCCXld//tf7FhzB3qfQ2FiPyb6+j4YRntZAdaJuWxFPtK4yiM6ybE/xB3 rR6oFPct4jhLaiD7T67sIroB1o1S4TqbFtgb6Vq5e2AyZ2XuGHWtQxSxhHdmy8oLAO/2xP92NCu KYkBZUw90eNG6CchqPA== X-Authority-Analysis: v=2.4 cv=JIs2csKb c=1 sm=1 tr=0 ts=696063f9 cx=c_pps a=wEP8DlPgTf/vqF+yE6f9lg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=h99DN6MNysFgGb7_OMAA:9 a=bBxd6f-gb0O0v-kibOvt:22 X-Proofpoint-GUID: BRK4mwb3ZKauH2NK5m5cbT_lQfcmF7jV X-Proofpoint-ORIG-GUID: BRK4mwb3ZKauH2NK5m5cbT_lQfcmF7jV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-09_01,2026-01-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 bulkscore=0 adultscore=0 spamscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601090012 Content-Type: text/plain; charset="utf-8" Add driver to support 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: Songwei Chai --- .../ABI/testing/sysfs-bus-amba-devices-tgu | 9 + drivers/Makefile | 1 + drivers/hwtracing/Kconfig | 2 + drivers/hwtracing/qcom/Kconfig | 18 ++ drivers/hwtracing/qcom/Makefile | 3 + drivers/hwtracing/qcom/tgu.c | 176 ++++++++++++++++++ drivers/hwtracing/qcom/tgu.h | 51 +++++ 7 files changed, 260 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-amba-devices-tgu create mode 100644 drivers/hwtracing/qcom/Kconfig create mode 100644 drivers/hwtracing/qcom/Makefile create mode 100644 drivers/hwtracing/qcom/tgu.c create mode 100644 drivers/hwtracing/qcom/tgu.h diff --git a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu b/Documen= tation/ABI/testing/sysfs-bus-amba-devices-tgu new file mode 100644 index 000000000000..56ec3f5ab5d6 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu @@ -0,0 +1,9 @@ +What: /sys/bus/amba/devices//enable_tgu +Date: January 2026 +KernelVersion 6.19 +Contact: Jinlong Mao , Songwei Chai +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/Makefile b/drivers/Makefile index ccc05f1eae3e..9608a3debb1f 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -177,6 +177,7 @@ obj-$(CONFIG_RAS) +=3D ras/ obj-$(CONFIG_USB4) +=3D thunderbolt/ obj-$(CONFIG_CORESIGHT) +=3D hwtracing/coresight/ obj-y +=3D hwtracing/intel_th/ +obj-y +=3D hwtracing/qcom/ obj-$(CONFIG_STM) +=3D hwtracing/stm/ obj-$(CONFIG_HISI_PTT) +=3D hwtracing/ptt/ obj-y +=3D android/ diff --git a/drivers/hwtracing/Kconfig b/drivers/hwtracing/Kconfig index 911ee977103c..8a640218eed8 100644 --- a/drivers/hwtracing/Kconfig +++ b/drivers/hwtracing/Kconfig @@ -7,4 +7,6 @@ source "drivers/hwtracing/intel_th/Kconfig" =20 source "drivers/hwtracing/ptt/Kconfig" =20 +source "drivers/hwtracing/qcom/Kconfig" + endmenu diff --git a/drivers/hwtracing/qcom/Kconfig b/drivers/hwtracing/qcom/Kconfig new file mode 100644 index 000000000000..d6f6d4b0f28e --- /dev/null +++ b/drivers/hwtracing/qcom/Kconfig @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# QCOM specific hwtracing drivers +# +menu "Qualcomm specific hwtracing drivers" + +config QCOM_TGU + tristate "QCOM Trigger Generation Unit driver" + help + This driver provides support for Trigger Generation Unit that is + used to detect patterns or sequences on a given set of signals. + TGU is used to monitor a particular bus within a given region to + detect illegal transaction sequences or slave responses. It is also + used to monitor a data stream to detect protocol violations and to + provide a trigger point for centering data around a specific event + within the trace data buffer. + +endmenu diff --git a/drivers/hwtracing/qcom/Makefile b/drivers/hwtracing/qcom/Makef= ile new file mode 100644 index 000000000000..5a0a868c1ea0 --- /dev/null +++ b/drivers/hwtracing/qcom/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_QCOM_TGU) +=3D tgu.o diff --git a/drivers/hwtracing/qcom/tgu.c b/drivers/hwtracing/qcom/tgu.c new file mode 100644 index 000000000000..c5b2b384e6ae --- /dev/null +++ b/drivers/hwtracing/qcom/tgu.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "tgu.h" + +static void tgu_write_all_hw_regs(struct tgu_drvdata *drvdata) +{ + TGU_UNLOCK(drvdata->base); + /* Enable TGU to program the triggers */ + writel(1, drvdata->base + TGU_CONTROL); + TGU_LOCK(drvdata->base); +} + +static int tgu_enable(struct device *dev) +{ + struct tgu_drvdata *drvdata =3D dev_get_drvdata(dev); + + guard(spinlock)(&drvdata->lock); + if (drvdata->enable) + return -EBUSY; + + tgu_write_all_hw_regs(drvdata); + drvdata->enable =3D true; + + return 0; +} + +static void tgu_disable(struct device *dev) +{ + struct tgu_drvdata *drvdata =3D dev_get_drvdata(dev); + + guard(spinlock)(&drvdata->lock); + if (drvdata->enable) { + TGU_UNLOCK(drvdata->base); + writel(0, drvdata->base + TGU_CONTROL); + TGU_LOCK(drvdata->base); + + drvdata->enable =3D false; + } +} + +static ssize_t enable_tgu_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tgu_drvdata *drvdata =3D dev_get_drvdata(dev); + bool enabled; + + guard(spinlock)(&drvdata->lock); + enabled =3D drvdata->enable; + + return sysfs_emit(buf, "%d\n", enabled ? 1 : 0); +} + +/* 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) +{ + unsigned long val; + int ret =3D 0; + + ret =3D kstrtoul(buf, 0, &val); + if (ret) + return ret; + + if (val) { + ret =3D pm_runtime_resume_and_get(dev); + if (ret) + return ret; + ret =3D tgu_enable(dev); + if (ret) { + pm_runtime_put(dev); + return ret; + } + } else { + tgu_disable(dev); + pm_runtime_put(dev); + } + + return size; +} +static DEVICE_ATTR_RW(enable_tgu); + +static struct attribute *tgu_common_attrs[] =3D { + &dev_attr_enable_tgu.attr, + NULL, +}; + +static const struct attribute_group tgu_common_grp =3D { + .attrs =3D tgu_common_attrs, + NULL, +}; + +static const struct attribute_group *tgu_attr_groups[] =3D { + &tgu_common_grp, + NULL, +}; + +static int tgu_probe(struct amba_device *adev, const struct amba_id *id) +{ + struct device *dev =3D &adev->dev; + struct tgu_drvdata *drvdata; + int ret; + + drvdata =3D devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->dev =3D &adev->dev; + dev_set_drvdata(dev, drvdata); + + drvdata->base =3D devm_ioremap_resource(dev, &adev->res); + if (IS_ERR(drvdata->base)) + return PTR_ERR(drvdata->base); + + spin_lock_init(&drvdata->lock); + + ret =3D sysfs_create_groups(&dev->kobj, tgu_attr_groups); + if (ret) { + dev_err(dev, "failed to create sysfs groups: %d\n", ret); + return ret; + } + + drvdata->enable =3D false; + + pm_runtime_put(&adev->dev); + return 0; +} + +static void tgu_remove(struct amba_device *adev) +{ + struct device *dev =3D &adev->dev; + + sysfs_remove_groups(&dev->kobj, tgu_attr_groups); + + tgu_disable(dev); +} + +static const struct amba_id tgu_ids[] =3D { + { + .id =3D 0x000f0e00, + .mask =3D 0x000fffff, + }, + { 0, 0, NULL }, +}; + +MODULE_DEVICE_TABLE(amba, tgu_ids); + +static struct amba_driver tgu_driver =3D { + .drv =3D { + .name =3D "qcom-tgu", + .suppress_bind_attrs =3D true, + }, + .probe =3D tgu_probe, + .remove =3D tgu_remove, + .id_table =3D tgu_ids, +}; + +module_amba_driver(tgu_driver); + +MODULE_AUTHOR("Songwei Chai "); +MODULE_AUTHOR("Jinlong Mao "); +MODULE_DESCRIPTION("Qualcomm Trigger Generation Unit driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/hwtracing/qcom/tgu.h b/drivers/hwtracing/qcom/tgu.h new file mode 100644 index 000000000000..b11cfb28261d --- /dev/null +++ b/drivers/hwtracing/qcom/tgu.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#ifndef _QCOM_TGU_H +#define _QCOM_TGU_H + +/* Register addresses */ +#define TGU_CONTROL 0x0000 +#define TGU_LAR 0xfb0 +#define TGU_UNLOCK_OFFSET 0xc5acce55 + +static inline void TGU_LOCK(void __iomem *addr) +{ + do { + /* Wait for things to settle */ + mb(); + writel_relaxed(0x0, addr + TGU_LAR); + } while (0); +} + +static inline void TGU_UNLOCK(void __iomem *addr) +{ + do { + writel_relaxed(TGU_UNLOCK_OFFSET, addr + TGU_LAR); + /* Make sure everyone has seen this */ + mb(); + } while (0); +} + +/** + * struct tgu_drvdata - Data structure for a TGU (Trigger Generator Unit) + * @base: Memory-mapped base address of the TGU device + * @dev: Pointer to the associated device structure + * @lock: 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; + spinlock_t lock; + bool enable; +}; + +#endif --=20 2.34.1