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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82739ff3722sm1132144b3a.30.2026.02.25.22.11.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Feb 2026 22:11:05 -0800 (PST) Message-ID: Date: Thu, 26 Feb 2026 14:11:00 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 2/7] qcom-tgu: Add TGU driver To: Songwei Chai , andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, konrad.dybcio@oss.qualcomm.com, suzuki.poulose@arm.com, james.clark@arm.com, krzk+dt@kernel.org, conor+dt@kernel.org Cc: 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 References: <20260226020454.3210149-1-songwei.chai@oss.qualcomm.com> <20260226020454.3210149-3-songwei.chai@oss.qualcomm.com> Content-Language: en-US From: Jie Gan In-Reply-To: <20260226020454.3210149-3-songwei.chai@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 0d5Rf0eGvn16-L-nf60UFy2yXNgSVWTR X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI2MDA1MiBTYWx0ZWRfX9NuL9sSevRXn FZdeMKHf5c7JLqt90wMyKy4I8Qm2NemwKuIbYSFo8suEhXyMQDcbrQNJiDM7GQOKKh7WJ0NcncX SDsa4hDqBHSfkR+t1FBhnA5A6njPJMDWrEAfJhW3i2q42PBZXum2nvt4fLFrmBYOEox+epFwMaG 1RZRsOdZagTDdjXCrzp59H1nj+cXcWInDzeI09KPZF0bitLhg5AfORrehV+kMC7uMFHlbq+4Ho9 CNLzIAhnCqBf+wDZqCMgEP6ZmB19hKIPuKC8JOJakLsIvc06RQ/XJj9xgYyP0Y3+Dy6GMpUvGzF 9Y3l/lsvs2E1LsoExTiQ3HSThedLYIlD8SX1SQicUvqA8xHozAgvoZWNufLeg9tUw5dnCka+lDu uUClEas2+9gPgOgdDSCGPKF4S+4+N4ub8GZbjxH1DEBdv3Yf5uKDP4xKEq5bMulTYYTc3F4dGSP IR7QIcUEDvXUJCVG7uQ== X-Authority-Analysis: v=2.4 cv=NJLYOk6g c=1 sm=1 tr=0 ts=699fe3fb cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=d5xPaorGRswOp7j5N5AA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-GUID: 0d5Rf0eGvn16-L-nf60UFy2yXNgSVWTR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-25_04,2026-02-25_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 suspectscore=0 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602260052 On 2/26/2026 10:04 AM, Songwei Chai wrote: > 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 | 183 ++++++++++++++++++ > drivers/hwtracing/qcom/tgu.h | 51 +++++ > 7 files changed, 267 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/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu > new file mode 100644 > index 000000000000..184430d88f1c > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu > @@ -0,0 +1,9 @@ > +What: /sys/bus/amba/devices//enable_tgu > +Date: February 2026 > +KernelVersion 6.20 This patch series should target version 7.1 Thanks, Jie > +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-$(CONFIG_RAS) += ras/ > obj-$(CONFIG_USB4) += thunderbolt/ > obj-$(CONFIG_CORESIGHT) += hwtracing/coresight/ > obj-y += hwtracing/intel_th/ > +obj-y += hwtracing/qcom/ > obj-$(CONFIG_STM) += hwtracing/stm/ > obj-$(CONFIG_HISI_PTT) += hwtracing/ptt/ > obj-y += android/ > diff --git a/drivers/hwtracing/Kconfig b/drivers/hwtracing/Kconfig > index 911ee977103c..8a640218eed8 100644 > --- a/drivers/hwtracing/Kconfig > +++ b/drivers/hwtracing/Kconfig > @@ -7,4 +7,6 @@ source "drivers/hwtracing/intel_th/Kconfig" > > source "drivers/hwtracing/ptt/Kconfig" > > +source "drivers/hwtracing/qcom/Kconfig" > + > endmenu > diff --git a/drivers/hwtracing/qcom/Kconfig b/drivers/hwtracing/qcom/Kconfig > new file mode 100644 > index 000000000000..d6f6d4b0f28e > --- /dev/null > +++ b/drivers/hwtracing/qcom/Kconfig > @@ -0,0 +1,18 @@ > +# SPDX-License-Identifier: GPL-2.0-only > +# > +# QCOM specific hwtracing drivers > +# > +menu "Qualcomm specific hwtracing drivers" > + > +config QCOM_TGU > + tristate "QCOM Trigger Generation Unit driver" > + help > + This driver provides support for Trigger Generation Unit that is > + used to detect patterns or sequences on a given set of signals. > + TGU is used to monitor a particular bus within a given region to > + detect illegal transaction sequences or slave responses. It is also > + used to monitor a data stream to detect protocol violations and to > + provide a trigger point for centering data around a specific event > + within the trace data buffer. > + > +endmenu > diff --git a/drivers/hwtracing/qcom/Makefile b/drivers/hwtracing/qcom/Makefile > new file mode 100644 > index 000000000000..5a0a868c1ea0 > --- /dev/null > +++ b/drivers/hwtracing/qcom/Makefile > @@ -0,0 +1,3 @@ > +# SPDX-License-Identifier: GPL-2.0 > + > +obj-$(CONFIG_QCOM_TGU) += tgu.o > diff --git a/drivers/hwtracing/qcom/tgu.c b/drivers/hwtracing/qcom/tgu.c > new file mode 100644 > index 000000000000..58c19f12f3d7 > --- /dev/null > +++ b/drivers/hwtracing/qcom/tgu.c > @@ -0,0 +1,183 @@ > +// 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 = dev_get_drvdata(dev); > + > + guard(spinlock)(&drvdata->lock); > + if (drvdata->enabled) > + return -EBUSY; > + > + tgu_write_all_hw_regs(drvdata); > + drvdata->enabled = true; > + > + return 0; > +} > + > +static void tgu_do_disable(struct tgu_drvdata *drvdata) > +{ > + TGU_UNLOCK(drvdata->base); > + writel(0, drvdata->base + TGU_CONTROL); > + TGU_LOCK(drvdata->base); > + > + drvdata->enabled = false; > +} > + > +static void tgu_disable(struct device *dev) > +{ > + struct tgu_drvdata *drvdata = dev_get_drvdata(dev); > + > + guard(spinlock)(&drvdata->lock); > + if (!drvdata->enabled) > + return; > + > + tgu_do_disable(drvdata); > +} > + > +static ssize_t enable_tgu_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct tgu_drvdata *drvdata = dev_get_drvdata(dev); > + bool enabled; > + > + guard(spinlock)(&drvdata->lock); > + enabled = drvdata->enabled; > + > + return sysfs_emit(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) > +{ > + unsigned long val; > + int ret; > + > + ret = kstrtoul(buf, 0, &val); > + if (ret || val > 1) > + return -EINVAL; > + > + if (val) { > + ret = pm_runtime_resume_and_get(dev); > + if (ret) > + return ret; > + ret = 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[] = { > + &dev_attr_enable_tgu.attr, > + NULL, > +}; > + > +static const 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) > +{ > + struct device *dev = &adev->dev; > + struct tgu_drvdata *drvdata; > + int ret; > + > + 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 (IS_ERR(drvdata->base)) > + return PTR_ERR(drvdata->base); > + > + spin_lock_init(&drvdata->lock); > + > + ret = sysfs_create_groups(&dev->kobj, tgu_attr_groups); > + if (ret) { > + dev_err(dev, "failed to create sysfs groups: %d\n", ret); > + return ret; > + } > + > + drvdata->enabled = false; > + > + pm_runtime_put(&adev->dev); > + > + return 0; > +} > + > +static void tgu_remove(struct amba_device *adev) > +{ > + struct device *dev = &adev->dev; > + > + sysfs_remove_groups(&dev->kobj, tgu_attr_groups); > + > + tgu_disable(dev); > +} > + > +static const struct amba_id tgu_ids[] = { > + { > + .id = 0x000f0e00, > + .mask = 0x000fffff, > + }, > + { 0, 0, NULL }, > +}; > + > +MODULE_DEVICE_TABLE(amba, tgu_ids); > + > +static struct amba_driver tgu_driver = { > + .drv = { > + .name = "qcom-tgu", > + .suppress_bind_attrs = true, > + }, > + .probe = tgu_probe, > + .remove = tgu_remove, > + .id_table = 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..dd7533b9d735 > --- /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 to private data > + * @enabled: 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 enabled; > +}; > + > +#endif