From patchwork Mon Aug 10 21:30:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sandeep Singh X-Patchwork-Id: 11708135 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3F39B16B1 for ; Mon, 10 Aug 2020 21:31:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 203852073E for ; Mon, 10 Aug 2020 21:31:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amdcloud.onmicrosoft.com header.i=@amdcloud.onmicrosoft.com header.b="a3vCBPQ5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726816AbgHJVbi (ORCPT ); Mon, 10 Aug 2020 17:31:38 -0400 Received: from mail-bn8nam08on2048.outbound.protection.outlook.com ([40.107.100.48]:25249 "EHLO NAM04-BN8-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726809AbgHJVbh (ORCPT ); Mon, 10 Aug 2020 17:31:37 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=L3u5pOOtU6Kdx9djmxAeXfUhJK1Cwrll9PyBhhnrvW8cOmRyxXTBvkG/J+mGhymDJNF6unkiIGzFY+fhXLc3Zgzwad/wjMbwah+VKZK8ZVYpYIu724CO74wM6q1bR8zcGnGPMfILGAJrPn9scnTBrCIG19NxVjmCgz5y8B0RUVmMzr6OS62KQQNCyrDZGUqXvel5tvUYvVB+F7DV9e06lLDPh1NEz4tQHSHGiaM2tiU0I5f6kTB4/YmkR5zXf+Uld364FAhkZ8wE313mavMHv8kazWwMPmUXcIxhaiPaKKj6nrAewclahtzCX3HJG2dWrTywjbIDcKPZk3CGuBebhA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=yv8pEQqlT0Q9ZMr1zBBMj5HC+xnStEschhTKQ5f9mmY=; b=XJ1EkeWdOCKmihl9fhYO4qPsxpUdpNLxCb4vr1vRVSEhH2AiwFzgMp+4dKBrZOGDtpfgamKYY6ko0g21pJ00KJ1VmmWG52+UoBmZiglnyRJ5TvDSyuuw1dPohpBKLbNdVsLl2APepKxFSjXd/cAasIf5yh4Ncf6R0DQSVA5M6HjsQ4PLWqzAhS92ytmgTJ3Tq9rwH91qnw42MHrlXXPAmPII4O86WudcZ6GRqVE1ApXTbTajTuXWvoT6+yYpgyoQh1OwAcRk92fXo1NluhmPDdDFH+H2G2EEfe1pHngoqDv21iS/wDCX/fnoGEUtigvMbpWRV0Zx/4+BD3PNC8SNsg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amdcloud.onmicrosoft.com; s=selector2-amdcloud-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=yv8pEQqlT0Q9ZMr1zBBMj5HC+xnStEschhTKQ5f9mmY=; b=a3vCBPQ50l+jCs5iYhiNzpQp66e0sQBUMhWSjriEZvdxlJi4W+LbEFDvLJ751YOL9JVh4hEkzh319j0X9p/4lkquCE/cGDtTeHgLy2fpkg3ZV5NOn4BGdJe0Vg3qwJvjQdU8d8v0TwQE5Rn3uyH5uTgNwXyK5ieRscxVaKvC8d0= Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=amd.com; Received: from BYAPR12MB2726.namprd12.prod.outlook.com (2603:10b6:a03:66::17) by BY5PR12MB3714.namprd12.prod.outlook.com (2603:10b6:a03:1a9::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3261.22; Mon, 10 Aug 2020 21:31:32 +0000 Received: from BYAPR12MB2726.namprd12.prod.outlook.com ([fe80::8503:3713:6ed0:af09]) by BYAPR12MB2726.namprd12.prod.outlook.com ([fe80::8503:3713:6ed0:af09%6]) with mapi id 15.20.3261.024; Mon, 10 Aug 2020 21:31:32 +0000 From: Sandeep Singh To: jikos@kernel.org, benjamin.tissoires@redhat.com, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, srinivas.pandruvada@linux.intel.com, jic23@kernel.org, linux-iio@vger.kernel.org, hdegoede@redhat.com, Nehal-bakulchandra.Shah@amd.com, andy.shevchenko@gmail.com, mail@richard-neumann.de, m.felsch@pengutronix.de, rdunlap@infradead.org Cc: Shyam-sundar.S-k@amd.com, Sandeep Singh Subject: [PATCH v7 1/4] SFH: Add maintainers and documentation for AMD SFH based on HID framework Date: Mon, 10 Aug 2020 21:30:52 +0000 Message-Id: <20200810213055.103962-2-Sandeep.Singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200810213055.103962-1-Sandeep.Singh@amd.com> References: <20200810213055.103962-1-Sandeep.Singh@amd.com> X-ClientProxiedBy: MA1PR0101CA0025.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:22::11) To BYAPR12MB2726.namprd12.prod.outlook.com (2603:10b6:a03:66::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from jatayu.amd.com (165.204.156.251) by MA1PR0101CA0025.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:22::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3261.18 via Frontend Transport; Mon, 10 Aug 2020 21:31:29 +0000 X-Mailer: git-send-email 2.25.1 X-Originating-IP: [165.204.156.251] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 36f08ab5-a323-4ebf-f6e0-08d83d74c058 X-MS-TrafficTypeDiagnostic: BY5PR12MB3714: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3968; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: oHwzkcMuHTR3IjJTTXnCzw2RYdBF/lKsriMmSa8WKh2feTBFVO01yLi0N57FfqU/UV2vSPyQbxxfi8Tnc5FgjNnWxn/3hVw7mo8oz1dqOQfnBbRml4UWKozK4DubyODbxLP4oaKJWy/qFlxo3QQoQsZxUjIo7U9Y2bMDQVL5AOdXTYamdm5H+A7qC9GQYO1GmBxddozn08qk4dPxN+mNyc+GkpxjPsTwieorVMCz4AoQvKpQd20+MD02pJ8pVopOWqcO/TV//Hco+lfCdqYsVGc7ePuyJJYBVu8mJeWPhV589tBTOmuggCsyVAGet310nOCo7wZkp0b0RTlLnaekPo0bnh6I97QQgIlCOv7xxmi9U77m8JApiXWVIAciidZ/ X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR12MB2726.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(366004)(39860400002)(136003)(376002)(346002)(396003)(2906002)(1076003)(7416002)(83380400001)(478600001)(6666004)(52116002)(66946007)(7696005)(8676002)(66476007)(66556008)(26005)(6486002)(5660300002)(8936002)(36756003)(956004)(2616005)(316002)(16526019)(4326008)(86362001)(186003)(921003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: W0nL9Mdc2cbbX2i45T2GYrTyrvGYZNC7xmcjpUNowdJPc71hskM5ph3mB4Saf+ZYI6VTxvJ4q7sjaOboL1/U2jXI+IQDnJsh+LU+K9c9jUGOALLSxehbnskUXk2fRdVonUUyn4LXFqW5eqx++X415NoPi4XWH04lW1KTbqwQgZTbLuvT6J/MU+6ucJvW6BWUt/sOteHARUSr3OuVF1ceqEsAD+KSaWGElN1vEAkjbVDqD1Gqh13/kNRhf4agdUVXIKZpmtBDBLIWR5tJ96Yu+kzZm7HybW5LDIFgHw2MPTHFJL3KA1Tbkd29aN0l7hEJg3fuBCiwjd3SZQnolb5eQgIxx+ZtFjqSJ8iHihp7Jxcnd895ia8XJQjzZU5XZlY47cg/7m/3e4vMeJa6uj8MMGJqsHeznEGAVtV/9IhRCcg+NBc7+0XNfNZC60fTKMR+kwDh/SPp/PhEHFpPvEAWU/0cYTbRVGEs096EAEf0BQxciv9cfpoMoyK/isnGrxpdrGuppBruBvgmG7tXnCN3pX/ZKFgmfzaApjuPuj/5eTk4BcnIeZ31ecZ9EEZoLSfAr83rX0G5oNU8ZsKhwrf0R3FzbvkEKqKO6F4DeS43TNoEx+1p3U2LpztP2h5lcFj/N2TJ+JLCtVcFb5vWoBh+Rg== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 36f08ab5-a323-4ebf-f6e0-08d83d74c058 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2726.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2020 21:31:32.7720 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: GX4rQkZf7FXKeYQe8+bc77xPIj5Z/Q1rPgKdP5tptanmMO/3uiwmOIwj41P5uWX5 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB3714 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Sandeep Singh Add Maintainers for AMD SFH(SENSOR FUSION HUB) Solution and work flow document. Signed-off-by: Nehal Shah Signed-off-by: Sandeep Singh --- Documentation/hid/amd-sfh-hid.rst | 153 ++++++++++++++++++++++++++++++ MAINTAINERS | 8 ++ 2 files changed, 161 insertions(+) create mode 100644 Documentation/hid/amd-sfh-hid.rst diff --git a/Documentation/hid/amd-sfh-hid.rst b/Documentation/hid/amd-sfh-hid.rst new file mode 100644 index 000000000000..0ee9003013f2 --- /dev/null +++ b/Documentation/hid/amd-sfh-hid.rst @@ -0,0 +1,153 @@ +.. SPDX-License-Identifier: GPL-2.0 + +AMD Sensor Fusion Hub:- +====================== +AMD Sensor Fusion Hub is part of a SOC starting from Ryzen based platforms. +The solution is working well on several OEM products. AMD SFH uses HID over PCIe bus. +In terms of architecture it resembles ISH .However the major difference is all +The hid reports are generated as part of kernel driver. + +Block Diagram:- +============= + ------------------------------- + | HID User Space Applications | + ------------------------------- +--------------------------------------------- + --------------------------------- + | HID Core | + --------------------------------- + + --------------------------------- + | AMD HID Transport | + --------------------------------- + + -------------------------------- + | AMD HID Client | + | with HID Report Generator| + -------------------------------- + + -------------------------------- + | AMD MP2 PCIe Driver | + -------------------------------- +--------------------------------------------- + ------------------------------- + | SFH MP2 Processor | + -------------------------------- + + +AMD HID Transport Layer :- +*************************** +AMD SFH transport is also implemented as a bus. Each client application executing in the AMD MP2 +is registered as a device on this bus. MP2 which is an ARM® Cortex-M4 core based co-processor to +x86. The driver, which binds each device (AMD SFH HID driver) identifies the device type and +registers with the hid core. Transport drivers attach a constant "struct hid_ll_driver" object with +each device. Once a device is registered with HID core, the callbacks provided via this struct are +used by HID core to communicate with the device. AMD HID Transport driver implements the synchronouscalls. + +AMD HID Client Layer:- +********************** +This layer is responsible to implement HID request and descriptors. As firmware is OS agnostic, +HID client layer fills the HID request structure and descriptors. HID client layer is in complex +in nature as it is interface between MP2 PCIe driver and HID. HID client layer initialized +the MP2 PCIe driver and holds the instance of MP2 driver.It identified the number of sensors +connected using MP2-PCIe driver and based on that allocate the DRAM address for each and every +sensor and pass it to MP2-PCIe driver.On enumeration of each sensor, client layer fills out the HID +Descriptor structure and HID input report structure. HID Feature report structure can be optional. +The report descriptor structure varies sensor to sensor. Now on enumeration client layer does +two major things +1. Register the HID sensor client to virtual bus (Platform driver) and bind it. +2. Probes the AMD HID transport driver. Which in turns register device to the core. + +AMD MP2 PCIe layer:- +******************** +MP2 PCIe Layer is responsible for making all transaction with the firmware over PCIe. +The connection establishment between firmware and PCIe happens here. + +The communication between X86 and MP2 is spilt into three parts. +1. Command Transfer => C2P Mailbox Register are used +2. Data Transfer => DRAM +3. Supported sensor info => P2C Register + +Commands are sent to MP2 using C2P Mail Box registers. These C2P registers are common between x86 +and MP2. Writing into C2P Message register generate interrupt to MP2. The client layer allocates +the physical memory and send the same to MP2 for data transfer. MP2 firmware uses HUBIF interface +to access DRAM memory. For Firmware always write minimum 32 bytes into DRAM.So it is expected that +driver shall allocate minimum 32 bytes DRAM space. + +Enumeration and Probing flow:- +***************************** + HID AMD AMD AMD -PCIe MP2 + Core Transport Client layer layer FW + | | | | | + | | | on Boot Driver Loaded | + | | | | | + | | | MP2-PCIe Int | + | | | | | + | | |---Get Number of sensors-> | | + | | | Read P2C | + | | | Register | + | | | | | + | | | Loop(for No of Sensors) | | + | | |----------------------| | | + | | | Create HID Descriptor| | | + | | | Create Input report | | | + | | | Descriptor Map | | | + | | | the MP2 FW Index to | | | + | | | HID Index | | | + | | | Allocate the DRAM | Enable | + | | | address | Sensors | + | | |----------------------| | | + | | HID transport| | Enable | + | |<--Probe------| |---Sensor CMD--> | + | | Create the | | | + | | HID device | | | + | | (MFD) | | | + | | by Populating| | | + | | the HID | | | + | | ll_driver | | | + | HID | | | | + | add | | | | + |Device | | | | + |<------------- | | | | + + +Data Flow from Application to the AMD SFH Driver:- +************************************************* + + | | | | | +Get | | | | | +Input | | | | | +Report | | | | | +---> | | | | | + |HID_req | | | | + |get_report | | | | + |------------->| | | | + | | HID_get_input| | | + | | report | | | + | |------------->|------------------------| | | + | | | Read the DRAM data for| | | + | | | requested sensor and | | | + | | | create the HID input | | | + | | | report | | | + | | |------------------------| | | + | |Data received | | | + | | in HID report| | | + To |<-------------|<-------------| | | +Applications | | | | +<-------| | | | | + + +Data Flow from AMD SFH Driver to Application:- +********************************************** + | | | | | + | | |------------------------| | | + | | |Periodically Read | | | + | | |the data for all | | | + | | |enumerated sensors | | | + | | |from the dram and create| | | + | | | HID Input reports | | | + | | |------------------------| | | + | |HID Input | | | + | |Input report | | | + <----submit to Application-----| | | + | | | | | diff --git a/MAINTAINERS b/MAINTAINERS index d53db30d1365..fc6a712893fb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -934,6 +934,14 @@ S: Supported F: arch/arm64/boot/dts/amd/amd-seattle-xgbe*.dtsi F: drivers/net/ethernet/amd/xgbe/ +AMD SENSOR FUSION HUB DRIVER +M: Nehal Shah +M: Sandeep Singh +L: linux-input@vger.kernel.org +S: Maintained +F: Documentation/hid/amd-sfh* +F: drivers/hid/amd-sfh-hid/ + ANALOG DEVICES INC AD5686 DRIVER M: Michael Hennerich L: linux-pm@vger.kernel.org