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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83965945101sm7346557b3a.13.2026.05.06.23.22.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 May 2026 23:23:04 -0700 (PDT) From: Sibi Sankar To: cristian.marussi@arm.com, sudeep.holla@kernel.org, cw00.choi@samsung.com, kyungmin.park@samsung.com, myungjoo.ham@samsung.com, konradybcio@kernel.org, andersson@kernel.org Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, arm-scmi@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, dmitry.baryshkov@oss.qualcomm.com, jonathanh@nvidia.com, thierry.reding@kernel.org, digetx@gmail.com, conor+dt@kernel.org, krzk+dt@kernel.org, robh@kernel.org, Shivnandan Kumar , Ramakrishna Gottimukkula , Amir Vajid Subject: [RFC V6 2/8] firmware: arm_scmi: vendors: Add QCOM SCMI Generic Extensions Date: Thu, 7 May 2026 11:52:31 +0530 Message-Id: <20260507062237.78051-3-sibi.sankar@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260507062237.78051-1-sibi.sankar@oss.qualcomm.com> References: <20260507062237.78051-1-sibi.sankar@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA3MDA2MCBTYWx0ZWRfX+IQZj9+lWsss Tx//AcIQHjt8rBeeB1PdycMC3oX/G4zSjKNqMEJVa9DIdxSGidxahrRxbn2X8+bBJQIk9Mahxws dWjBuq8vqDa+ysR0+zk4zH1DKHh8UuG+fnsglM6epsN314dzk+0VvCsWJMZ+osueHivJsLKVMIe 078ZjHC7OZwMCBmOU3u+NNr/zN+eoDAECvj6QS/QTFQxXmpo/cSujkbl20Gu+7pnE4JgfgAHQYW ahXetllQn+1CbQfRHzpgTCvxb1oqjS8cVWEz3HUn7Rxch3rV8TKitXh5FdKhS+vHIioUwG352fo 0JzUd2UwS8GLFs7RqqEPL9e6fZejf6vdDxnmnZ6fYKGHnGdfgHtYX8ZV6NVPUdAiPReq4WKJ7R/ BKnPRtVe/LXZkvzUmga2OHgaJo3bvi3MLZ+u5GUxmskBXY/UpTtGovry9sdvTjLBAaHg83D4xlr 30ahBtYuLf1PyGmZJDw== X-Proofpoint-ORIG-GUID: HGt6RK-h3IDdBdgeI4iRjwh9YCtot5n8 X-Authority-Analysis: v=2.4 cv=SuagLvO0 c=1 sm=1 tr=0 ts=69fc2fca cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=5qo32d-oOMBYuVP3DBMA:9 a=zc0IvFSfCIW2DFIPzwfm:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-GUID: HGt6RK-h3IDdBdgeI4iRjwh9YCtot5n8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-06_02,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 adultscore=0 phishscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605070060 The QCOM SCMI Generic Extensions Protocol provides a generic way of exposing a number of Qualcomm SoC specific features (like memory bus scaling) through a mixture of pre-determined algorithm strings and param_id pairs hosted on the SCMI controller. Co-developed-by: Shivnandan Kumar Signed-off-by: Shivnandan Kumar Co-developed-by: Ramakrishna Gottimukkula Signed-off-by: Ramakrishna Gottimukkula Co-developed-by: Amir Vajid Signed-off-by: Amir Vajid Signed-off-by: Sibi Sankar --- @Sudeep/@Christian, Just moving the series back in RFC mode to get feedback on the devfreq part of the series. Will add a lot more documentation in the next re-spin, so definitely not ignoring your earlier comments :). drivers/firmware/arm_scmi/Kconfig | 1 + drivers/firmware/arm_scmi/Makefile | 1 + .../firmware/arm_scmi/vendors/qcom/Kconfig | 15 ++ .../firmware/arm_scmi/vendors/qcom/Makefile | 2 + .../arm_scmi/vendors/qcom/qcom-generic-ext.c | 135 ++++++++++++++++++ include/linux/scmi_qcom_protocol.h | 37 +++++ 6 files changed, 191 insertions(+) create mode 100644 drivers/firmware/arm_scmi/vendors/qcom/Kconfig create mode 100644 drivers/firmware/arm_scmi/vendors/qcom/Makefile create mode 100644 drivers/firmware/arm_scmi/vendors/qcom/qcom-generic-ext.c create mode 100644 include/linux/scmi_qcom_protocol.h diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig index e3fb36825978..a52f4d1b8b2c 100644 --- a/drivers/firmware/arm_scmi/Kconfig +++ b/drivers/firmware/arm_scmi/Kconfig @@ -84,6 +84,7 @@ config ARM_SCMI_QUIRKS source "drivers/firmware/arm_scmi/transports/Kconfig" source "drivers/firmware/arm_scmi/vendors/imx/Kconfig" +source "drivers/firmware/arm_scmi/vendors/qcom/Kconfig" endif #ARM_SCMI_PROTOCOL diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index 780cd62b2f78..5a0e003c2477 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -13,6 +13,7 @@ scmi-module-objs := $(scmi-driver-y) $(scmi-protocols-y) $(scmi-transport-y) obj-$(CONFIG_ARM_SCMI_PROTOCOL) += transports/ obj-$(CONFIG_ARM_SCMI_PROTOCOL) += vendors/imx/ +obj-$(CONFIG_ARM_SCMI_PROTOCOL) += vendors/qcom/ obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-module.o diff --git a/drivers/firmware/arm_scmi/vendors/qcom/Kconfig b/drivers/firmware/arm_scmi/vendors/qcom/Kconfig new file mode 100644 index 000000000000..5dd9e8a6b75f --- /dev/null +++ b/drivers/firmware/arm_scmi/vendors/qcom/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "ARM SCMI QCOM Vendor Protocols" + +config QCOM_SCMI_GENERIC_EXT + tristate "Qualcomm Technologies, Inc. Qcom SCMI vendor Protocol" + depends on ARM_SCMI_PROTOCOL || COMPILE_TEST + help + The QCOM SCMI vendor protocol provides a generic way of exposing + a number of Qualcomm SoC specific features (like memory bus scaling) + through a mixture of pre-determined algorithm strings and param_id + pairs hosted on the SCMI controller. + + This driver defines/documents the message ID's used for this + communication and also exposes the operations used by the clients. +endmenu diff --git a/drivers/firmware/arm_scmi/vendors/qcom/Makefile b/drivers/firmware/arm_scmi/vendors/qcom/Makefile new file mode 100644 index 000000000000..6b98fabbebb8 --- /dev/null +++ b/drivers/firmware/arm_scmi/vendors/qcom/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_QCOM_SCMI_GENERIC_EXT) += qcom-generic-ext.o diff --git a/drivers/firmware/arm_scmi/vendors/qcom/qcom-generic-ext.c b/drivers/firmware/arm_scmi/vendors/qcom/qcom-generic-ext.c new file mode 100644 index 000000000000..4f9eba8ff4bd --- /dev/null +++ b/drivers/firmware/arm_scmi/vendors/qcom/qcom-generic-ext.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include + +#include "../../common.h" + +/** + * enum qcom_generic_ext_protocol_cmd - vendor specific commands supported by SCMI Qualcomm + * generic vendor protocol. + * + * This protocol is intended as a generic way of exposing a number of Qualcomm SoC + * specific features through a mixture of pre-determined algorithm string and param_id + * pairs hosted on the SCMI controller. + * + * The QCOM SCMI Vendor Protocol has the protocol id as 0x80 and vendor id set to + * Qualcomm and the supported version is set to 0x10000. The PROTOCOL_VERSION command + * returns version 1.0. + * + * @QCOM_SCMI_SET_PARAM: is used to set the parameter of a specific algo_str hosted on + * QCOM SCMI Vendor Protocol. The tx len depends on the algo_str used. + * @QCOM_SCMI_GET_PARAM: is used to get parameter information of a specific algo_str + * hosted on QCOM SCMI Vendor Protocol. The tx and rx len depends + * on the algo_str used. + * @QCOM_SCMI_START_ACTIVITY: is used to start the activity performed by the algo_str. + * @QCOM_SCMI_STOP_ACTIVITY: is used to stop a pre-existing activity performed by the algo_str. + */ +enum qcom_generic_ext_protocol_cmd { + QCOM_SCMI_SET_PARAM = 0x10, + QCOM_SCMI_GET_PARAM = 0x11, + QCOM_SCMI_START_ACTIVITY = 0x12, + QCOM_SCMI_STOP_ACTIVITY = 0x13, +}; + +/** + * struct qcom_scmi_msg - represents the various parameters to be populated + * for using the QCOM SCMI Vendor Protocol + * + * @ext_id: reserved, must be zero + * @algo_low: lower 32 bits of the algo_str + * @algo_high: upper 32 bits of the algo_str + * @param_id: serves as token message id to the specific algo_str + * @buf: serves as the payload to the specified param_id and algo_str pair + */ +struct qcom_scmi_msg { + __le32 ext_id; + __le32 algo_low; + __le32 algo_high; + __le32 param_id; + __le32 buf[]; +}; + +static int qcom_scmi_common_xfer(const struct scmi_protocol_handle *ph, + enum qcom_generic_ext_protocol_cmd cmd_id, void *buf, + size_t buf_len, u64 algo_str, u32 param_id, size_t rx_size) +{ + struct scmi_xfer *t; + struct qcom_scmi_msg *msg; + int ret; + + ret = ph->xops->xfer_get_init(ph, cmd_id, buf_len + sizeof(*msg), rx_size, &t); + if (ret) + return ret; + + msg = t->tx.buf; + msg->algo_low = cpu_to_le32(lower_32_bits(algo_str)); + msg->algo_high = cpu_to_le32(upper_32_bits(algo_str)); + msg->param_id = cpu_to_le32(param_id); + memcpy(msg->buf, buf, buf_len); + + ret = ph->xops->do_xfer(ph, t); + if (!ret && rx_size) + memcpy(buf, t->rx.buf, t->rx.len); + ph->xops->xfer_put(ph, t); + + return ret; +} + +static int qcom_scmi_set_param(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id) +{ + return qcom_scmi_common_xfer(ph, QCOM_SCMI_SET_PARAM, buf, buf_len, algo_str, + param_id, 0); +} + +static int qcom_scmi_get_param(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id, size_t rx_size) +{ + return qcom_scmi_common_xfer(ph, QCOM_SCMI_GET_PARAM, buf, buf_len, algo_str, + param_id, rx_size); +} + +static int qcom_scmi_start_activity(const struct scmi_protocol_handle *ph, void *buf, + size_t buf_len, u64 algo_str, u32 param_id) +{ + return qcom_scmi_common_xfer(ph, QCOM_SCMI_START_ACTIVITY, buf, buf_len, algo_str, + param_id, 0); +} + +static int qcom_scmi_stop_activity(const struct scmi_protocol_handle *ph, void *buf, + size_t buf_len, u64 algo_str, u32 param_id) +{ + return qcom_scmi_common_xfer(ph, QCOM_SCMI_STOP_ACTIVITY, buf, buf_len, algo_str, + param_id, 0); +} + +static struct qcom_generic_ext_ops qcom_proto_ops = { + .set_param = qcom_scmi_set_param, + .get_param = qcom_scmi_get_param, + .start_activity = qcom_scmi_start_activity, + .stop_activity = qcom_scmi_stop_activity, +}; + +static int qcom_generic_ext_protocol_init(const struct scmi_protocol_handle *ph) +{ + dev_dbg(ph->dev, "QCOM Generic Vendor Version %d.%d\n", + PROTOCOL_REV_MAJOR(ph->version), PROTOCOL_REV_MINOR(ph->version)); + + return 0; +} + +static const struct scmi_protocol qcom_generic_ext = { + .id = SCMI_PROTOCOL_QCOM_GENERIC, + .owner = THIS_MODULE, + .instance_init = &qcom_generic_ext_protocol_init, + .ops = &qcom_proto_ops, + .vendor_id = "Qualcomm", + .supported_version = 0x10000, +}; +module_scmi_protocol(qcom_generic_ext); + +MODULE_DESCRIPTION("QCOM SCMI Generic Vendor protocol"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/scmi_qcom_protocol.h b/include/linux/scmi_qcom_protocol.h new file mode 100644 index 000000000000..465b2522ca29 --- /dev/null +++ b/include/linux/scmi_qcom_protocol.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * SCMI Message Protocol driver QCOM extension header + * + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#ifndef _LINUX_SCMI_QCOM_PROTOCOL_H +#define _LINUX_SCMI_QCOM_PROTOCOL_H + +#include + +#define SCMI_PROTOCOL_QCOM_GENERIC 0x80 + +struct scmi_protocol_handle; + +/** + * struct qcom_generic_ext_ops - represents the various operations provided + * by QCOM Generic Vendor Protocol + * + * @set_param: set parameter specified by param_id and algo_str pair. + * @get_param: retrieve parameter specified by param_id and algo_str pair. + * @start_activity: initiate a specific activity defined by algo_str. + * @stop_activity: halt previously initiated activity defined by algo_str. + */ +struct qcom_generic_ext_ops { + int (*set_param)(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id); + int (*get_param)(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id, size_t rx_size); + int (*start_activity)(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id); + int (*stop_activity)(const struct scmi_protocol_handle *ph, void *buf, size_t buf_len, + u64 algo_str, u32 param_id); +}; + +#endif /* _LINUX_SCMI_QCOM_PROTOCOL_H */ -- 2.34.1