Received: by 2002:a05:6a10:413:0:0:0:0 with SMTP id 19csp405212pxp; Fri, 11 Mar 2022 06:39:15 -0800 (PST) X-Google-Smtp-Source: ABdhPJzEkpEuxDKhN4J7F3TM1de+od1Db50EolnjZ7G/L1gP5k8j/ANXTo4ldeGE/kMt2zAwAchQ X-Received: by 2002:a65:604a:0:b0:380:c8be:38d9 with SMTP id a10-20020a65604a000000b00380c8be38d9mr8562339pgp.566.1647009555382; Fri, 11 Mar 2022 06:39:15 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1647009555; cv=pass; d=google.com; s=arc-20160816; b=T36N2LcRusAkj10VcY2ZLlIGa8HL6KQWJp4yAynPmounVYbTOIEmJ0ExLyRtMJdTfy nO0FL7yvACZsAcyRiFW5USMACMzJJvPJmrl0vF/FtT9gbDxhNqEPu0NZYTJ1O9Id7ca6 +fONb8kYazpXSUn9pV0Aa0WLzhwtsaEkGogNBLYAriJnYKyq8YZyjTfrebAkYkGU0Qh/ psOgQpVFvIIrGbT4M2zPXATj8MKCJaXG8wSNucQaSWBncO62gkb/DElSSZGQAHTRVNNy iROvjigRdJm1ZkkvbrAv4LxuqMEGkpMlMvaWbzmyHs4LIEBb2dm7pTQAnqT4+zqkq66p wOkg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=JvWm84ASHNFLEyrKTTKG6qYhEcrD9hzNbMGXYtBKHXY=; b=ZCbwsgVA/+MZH7Zu+tPCPQ9g4EpCVoaCD2FxcWfaUiISLTJ2Ef4L0bdGL8rw7ybpti hqKXfMBkey8uie91db3VlbpTfp1054dPwJWSda+pXEtotlvrqql6WmhwKZ/hBlF5xCgX oTqXj1J7hANTrhqi6eClb3ZK6ITaq/UhVVHr0yLJDhKR8eKK56TH0IcfWfeH3ohXJVdM NbNhxvebTGpDxDm8qkQ/h1jKpuOCfudT39ce5nSmGja7d8L3KXZAyBZLqzsKEgbbuuyn EsWvwmcohqZwRW93pr+YcRlPkZtX9T76l/OXw5srOpTcK6L9stHgRU7FUgTXEN0ctmFj 03bQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@os.amperecomputing.com header.s=selector2 header.b=Kx4Vhc6X; arc=pass (i=1 spf=pass spfdomain=os.amperecomputing.com dkim=pass dkdomain=os.amperecomputing.com dmarc=pass fromdomain=os.amperecomputing.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amperecomputing.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id u17-20020a634711000000b00373337d31c1si7929757pga.673.2022.03.11.06.38.58; Fri, 11 Mar 2022 06:39:15 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@os.amperecomputing.com header.s=selector2 header.b=Kx4Vhc6X; arc=pass (i=1 spf=pass spfdomain=os.amperecomputing.com dkim=pass dkdomain=os.amperecomputing.com dmarc=pass fromdomain=os.amperecomputing.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amperecomputing.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237566AbiCJLnC (ORCPT + 99 others); Thu, 10 Mar 2022 06:43:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241717AbiCJLm6 (ORCPT ); Thu, 10 Mar 2022 06:42:58 -0500 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2095.outbound.protection.outlook.com [40.107.243.95]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C8E9144F6C; Thu, 10 Mar 2022 03:41:56 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=WRyXzHGISb5JubypSkWIG+zUQh35HjXVewRmBNBM2UbOYhG1wWFp0MVIs6evNz3WVpwljJXSwL2G7FI6W/u5uDTxJJWcj0yrIZyOwkrYiFOAsfKg0qNCqA1BSdI7Y+kcYCFOyQvgm0H7ZqZGSp743/Zo9vDgOHp3HUe1dJlqPcn+KUEz5TZQPcvf9yUXJpJljKTKo2aAuSE1OkYvfBTDfM3vGjkmyKoaC65MaEDB3xqF6F173dYqJPzphq+k6PUbYOLHiFGMCzEL0D8KtSLBUWoPeymxc5F/Lnwft8RWNKoU6mqXQKw9Dea79BwmVnO0NXlcG986gXyzqSgg6uwMpw== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=JvWm84ASHNFLEyrKTTKG6qYhEcrD9hzNbMGXYtBKHXY=; b=ci+ZGQBhuFhSRop1mNKSZdhVq3ND19nB4IOEZP4ogzoYohEQbzWA/hDB9N3nt8Yv6nL41/RbWIbvyWfM/8/iI6j9pKOWu3LgVsU92Z3KqvWsiPbs+z/MwcG4w8bOus+sg81xAqjDb2SRi1Qj9QDF/GgawWvQFRMbvlkmzY/B54S4znN/b91bi79sQBK5Fu8kx3DOBuWaIDGKkRM4KF7htf3ntXiZjjC8ESmuUjzL30hCB+7/arwZUkMiUxo84hAomRNrpMWa8BkgrAz90RTPUW6LPtpSiaF/pDn1wrzE0xj6ZRqjEgjv62C/Ax/FtHjabjVcvWJ29i5qWeD92CTACA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=os.amperecomputing.com; dmarc=pass action=none header.from=os.amperecomputing.com; dkim=pass header.d=os.amperecomputing.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=os.amperecomputing.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=JvWm84ASHNFLEyrKTTKG6qYhEcrD9hzNbMGXYtBKHXY=; b=Kx4Vhc6Xf3wfjdbaFghQDyiCC1PqAmNdrhMBOqUhxaij+yHGV7siHt5l1zndMX5QQbFBdXGPJa+L7OxXJosvQhyoZwbP6IWeBeTwWK5RAWfGRg2Lwc9gAyDOXBTAL0+9FzDdfJvgfN9IzhAtrMopM6IpHf2Qu8rEVqgKFguwq0U= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=os.amperecomputing.com; Received: from SJ0PR01MB7282.prod.exchangelabs.com (2603:10b6:a03:3f2::24) by BL0PR01MB4305.prod.exchangelabs.com (2603:10b6:208:4d::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5061.22; Thu, 10 Mar 2022 11:41:53 +0000 Received: from SJ0PR01MB7282.prod.exchangelabs.com ([fe80::cd24:39ed:7042:46d6]) by SJ0PR01MB7282.prod.exchangelabs.com ([fe80::cd24:39ed:7042:46d6%6]) with mapi id 15.20.5038.027; Thu, 10 Mar 2022 11:41:53 +0000 From: Quan Nguyen To: Corey Minyard , Rob Herring , Krzysztof Kozlowski , Joel Stanley , Andrew Jeffery , Brendan Higgins , Benjamin Herrenschmidt , Wolfram Sang , openipmi-developer@lists.sourceforge.net, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org Cc: Open Source Submission , Phong Vo , "Thang Q . Nguyen" Subject: [PATCH v6 1/4] ipmi: ssif_bmc: Add SSIF BMC driver Date: Thu, 10 Mar 2022 18:41:16 +0700 Message-Id: <20220310114119.13736-2-quan@os.amperecomputing.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220310114119.13736-1-quan@os.amperecomputing.com> References: <20220310114119.13736-1-quan@os.amperecomputing.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR02CA0125.apcprd02.prod.outlook.com (2603:1096:4:188::13) To SJ0PR01MB7282.prod.exchangelabs.com (2603:10b6:a03:3f2::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e8a3997a-4e52-4386-d092-08da028af8ea X-MS-TrafficTypeDiagnostic: BL0PR01MB4305:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ0PR01MB7282.prod.exchangelabs.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(107886003)(6666004)(66556008)(66476007)(66946007)(30864003)(1076003)(5660300002)(2616005)(7416002)(316002)(38350700002)(38100700002)(86362001)(4326008)(8676002)(8936002)(83380400001)(26005)(186003)(921005)(2906002)(52116002)(6512007)(508600001)(110136005)(6506007)(6486002)(54906003);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?YVBvcDZBdXlLV3lVZi94ZFJIQjBCcXNJcDdNMTRMdmYwZ3YyTkZvTmhKU2Rv?= =?utf-8?B?SnlyRSsvaDNQaTVRRkxrWnpaZlRsVENrdFR6Um9aMzV3M0NONDAvb0VMaERq?= =?utf-8?B?U3ZIcWI0V0MydGY0aE9iZjRTa1loWW80NU94WmwySlZOOGxNNVEyTE50VFpE?= =?utf-8?B?VGxrUk9YTjdSemJ0VDhubDJnRjdwdVJuM29hTHJvZzd2T2ZuL1diL0tLQjls?= =?utf-8?B?Zit5bUw5UHBQSHlycVZDbEo4SVdCRFdzZU96STVVcUV2V1FpNm1RbWNya01T?= =?utf-8?B?ajc4dkdIQW1oUmNQelczZytFNlp1UDZJNExzSUUybFJiTnh1RCtmYWxnR1Ey?= =?utf-8?B?Zm9EbENEem85SjlPdWR6c0FSdC9GY2dXM2d4L3ZyQ1JIaUVIYWYrNWsyRGFR?= =?utf-8?B?TXlxYk1EcTR1dzZRcWNLY0FVY0pmWXQyUFRwMUhwU0pTRGpNTjB4ZUZ3Snht?= =?utf-8?B?YUpqU1ZGeHg5V2dkMHRveFR0aXcxa0c1VEFPRVY0MzFlenRLQlBMbThWalVE?= =?utf-8?B?dGR2R2ZZeUh0Z2RIcnJvZDZDVEVNQmdZdFRERHhuZ1N0cVd1NWhuN0RkVHRS?= =?utf-8?B?L2RlU1dHRVlBcnZhYURMbEwrYTI3QW52Y1YySGE1aU1rZDgrTHRzY3FLZWU5?= =?utf-8?B?enNZRjNGdHJ0QjdWNjJMV1U3anRmbk1adW9PY0MzUHJWVGdoQVFnaFYxazBQ?= =?utf-8?B?S2FGZWgrSW9jZVlpUStGVGtpRUhPeXp1SVlDUXM3YzdtRHVTa1FyNlh4aUV1?= =?utf-8?B?VXhtOWkwMkNlTUNDMG1OQWpZb1E3QS9WZHdpa1Q3Zk1RUlhZRVlDU2Flakww?= =?utf-8?B?TldJK2FlbDRuRjhXZDdYZm5sWmVMcXVNSWlGZzBWYU5IQUJ0SGxHZEtqUlla?= =?utf-8?B?a0xQd1NZMlFzcnV5QkY0aWlyTnhXZFZQeVgwNGVvbzByT3FwK0xsR25kSTRk?= =?utf-8?B?cm0zdG1mcVAxRldqTWNkMFk4Q0hWRTZhL05aYkpVOEkxYSs2NzJRQkZDN1k2?= =?utf-8?B?aDhMbHptdlhJNTJ3bWtTeUF5cVIzcUN4bG52OW9XQThWaEx0aHJCOGdGUlda?= =?utf-8?B?eHpNVDdVdGprOTJ3eE9yMHVmK0VpRjZpNnZ0dVZXMzRxOUNBWDhwRXUzenpw?= =?utf-8?B?UGZ4dnVqa21jeThHRU9EWnAyNmxHd3lRdjVMeVFHZlNTZ0FXWXc3dVp2cmFO?= =?utf-8?B?Z0tiM2JMQUp5Z0puUXhlUGtoRnVtR2ppSXdSYmw3VjhqZHlsVWVlay9xUzRW?= =?utf-8?B?cnQxOTllOHFzNjJCcmdJeFRwK1pOL3M4cVBBZDQzWWl5cXJoV1FOTlRYNmxN?= =?utf-8?B?QVBTa0FNU2hRdmhYWkczUzhseUJQYjhLbUljZ1hDOWZ0VHl2NTNJOWFCUzBl?= =?utf-8?B?QXdxZVRQZ3RwSHpMN0ZYdEFCS2VNMlJPK0I4Y0hmVmhqamV6dkcxM0dkdzNa?= =?utf-8?B?TmsrWk5UQ2pUQW5SRGQyUGlsQVQ4RVQ0UzU3VzhoVkw3RGpQWWY2RlY5SHZ3?= =?utf-8?B?OC90d282UUQ0bVoxalNDNjBTaUJqeVFEU0lnS3paTUlFeTc4TTVFQjJhZC9o?= =?utf-8?B?UHBkd3J6dE1mcGpDV2JPU0daN3pqKzNTa3dXa3hIV28xMFBkUjZKV3B1NTVF?= =?utf-8?B?ZmRFMXFHQndqTWhGUFZ1Y3d0bHFHZndmNjVHUmYyNkVTcVFsaVpqRitmUXMz?= =?utf-8?B?K0lvbmFsVmxEUEdMSUxHOUU5VkNremN2bitQYlhBOTdyMlFHdnE2RSsyTjRE?= =?utf-8?B?ZHBYOXRlUmptR0w1cWZUZmc4ajVEZ1FwMnMzbTd1OW41UXFFK2hERE1aNFR0?= =?utf-8?B?WmhrV3h1bjYzZjg0WHl6VThTOXE0aEdyZjh4dmRBa0ZIdXVOSURYRktKaWly?= =?utf-8?B?TWJHSERlVWVwcTl2MDRVT0lIL0tSRkp6QWhkQ0w2MzlzNWRYdW5TSVY2WU1u?= =?utf-8?B?SjZoNFY0eDV6bTNwMUcwZk9IcXl2S3VRd0haZmNIRlp1QUV1YUFFZ0dqbEk0?= =?utf-8?Q?nIy5RFXmTEW49Rcfz6l5HcgIx9mAaI=3D?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: e8a3997a-4e52-4386-d092-08da028af8ea X-MS-Exchange-CrossTenant-AuthSource: SJ0PR01MB7282.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2022 11:41:53.7319 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: lTbl/p67v9qAS/IHQAeKroXsQ7y9QsDsteDekZKRV+TIjRRD75zxzAr6kHaZDRT9bbCAhpRJRwDbAgF7p9008i5cwHpRyDVytHI2p4JrpEM= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR01MB4305 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The SMBus system interface (SSIF) IPMI BMC driver can be used to perform in-band IPMI communication with their host in management (BMC) side. Signed-off-by: Quan Nguyen --- v6: + Drop the use of slave_enable() [Wolfram] + Make i2c-aspeed to issue RxCmdLast command on all I2C_SLAVE_WRITE_REQUESTED event to assert NAK when slave busy [Quan] + Make i2c slave to return -EBUSY when it's busy [Quan] + Drop the aborting feature as return Completion Code 0xFF may stop host to retry and make ipmi_ssif.so fails to load [Quan] + Add timer to recover slave from busy state when no response [Quan] + Clean request/response buffer appropriately [Quan] + Add some minor change on error and warning messages [Quan] v5: + None v4: + Send response with Completion code 0xFF when aborting [Quan] + Added bounding check on SMBus writes and the whole request [Dan] + Moved buffer to end of struct ssif_bmc_ctx to avoid context corruption if somehow buffer is written past the end [Dan] + Return -EINVAL if userspace buffer too small, dont silence truncate [Corey, Joel] + Not necessary to check NONBLOCK in lock [Corey] + Enforce one user at a time [Joel] + Reject write with invalid response length from userspace [Corey] + Add state machines for better ssif bmc state handling [Quan] + Drop ssif_bmc_aspeed.c and make ssif_bmc.c is generic SSIF BMC driver [Quan] + Change compatible string "aspeed,ast2500-ssif-bmc" to "ampere,ssif-bmc" [Quan] + Abort current request with invalid SMBus write or invalid command [Quan] + Abort all request if there is pending response [Quan] + Changed validate_pec() to validate_request() [Quan] + Add unsupported_smbus_cmd() to handle unknown SMBus command [Quan] + Print internal state string for ease investigating issue [Quan] + Move to READY state on SLAVE_STOP event [Quan] + Change initilize_transfer() to process_smbus_cmd() [Quan] + Introduce functions for each slave event [Quan] v3: + Removed redundant license info [Joel] + Switched to use traditional if-else [Joel] + Removed unused ssif_bmc_ioctl() [Joel] + Made handle_request()/complete_response() to return void [Joel] + Refactored send_ssif_bmc_response() and receive_ssif_bmc_request() [Corey] + Removed mutex [Corey] + Use spin_lock/unlock_irqsave/restore in callback [Corey] + Removed the unnecessary memset [Corey] + Switch to use dev_err() [Corey] v2: + Fixed compiling error with COMPILE_TEST for arc drivers/char/ipmi/Kconfig | 11 + drivers/char/ipmi/Makefile | 1 + drivers/char/ipmi/ssif_bmc.c | 791 +++++++++++++++++++++++++++++++++++ drivers/char/ipmi/ssif_bmc.h | 102 +++++ 4 files changed, 905 insertions(+) create mode 100644 drivers/char/ipmi/ssif_bmc.c create mode 100644 drivers/char/ipmi/ssif_bmc.h diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index b061e6b513ed..18a89093d64e 100644 --- a/drivers/char/ipmi/Kconfig +++ b/drivers/char/ipmi/Kconfig @@ -169,6 +169,17 @@ config ASPEED_BT_IPMI_BMC found on Aspeed SOCs (AST2400 and AST2500). The driver implements the BMC side of the BT interface. +config SSIF_IPMI_BMC + tristate "SSIF IPMI BMC driver" + select I2C + select I2C_SLAVE + help + This enables the IPMI SMBus system interface (SSIF) at the + management (BMC) side. + + The driver implements the BMC side of the SMBus system + interface (SSIF). + config IPMB_DEVICE_INTERFACE tristate 'IPMB Interface handler' depends on I2C diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile index 7ce790efad92..cb6138b8ded9 100644 --- a/drivers/char/ipmi/Makefile +++ b/drivers/char/ipmi/Makefile @@ -30,3 +30,4 @@ obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o obj-$(CONFIG_IPMB_DEVICE_INTERFACE) += ipmb_dev_int.o +obj-$(CONFIG_SSIF_IPMI_BMC) += ssif_bmc.o diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c new file mode 100644 index 000000000000..62db97773654 --- /dev/null +++ b/drivers/char/ipmi/ssif_bmc.c @@ -0,0 +1,791 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * The driver for BMC side of SSIF interface + * + * Copyright (c) 2022, Ampere Computing LLC + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ssif_bmc.h" + +static const char *state_to_string(enum ssif_state state) +{ + switch (state) { + case SSIF_READY: + return "SSIF_READY"; + case SSIF_START: + return "SSIF_START"; + case SSIF_SMBUS_CMD: + return "SSIF_SMBUS_CMD"; + case SSIF_REQ_RECVING: + return "SSIF_REQ_RECVING"; + case SSIF_RES_SENDING: + return "SSIF_RES_SENDING"; + case SSIF_BAD_SMBUS: + return "SSIF_BAD_SMBUS"; + default: + return "SSIF_STATE_UNKNOWN"; + } +} + +/* Handle SSIF message that will be sent to user */ +static ssize_t ssif_bmc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) +{ + struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); + struct ssif_msg msg; + unsigned long flags; + ssize_t ret; + + spin_lock_irqsave(&ssif_bmc->lock, flags); + while (!ssif_bmc->request_available) { + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + ret = wait_event_interruptible(ssif_bmc->wait_queue, + ssif_bmc->request_available); + if (ret) + return ret; + spin_lock_irqsave(&ssif_bmc->lock, flags); + } + + if (count < min_t(ssize_t, ssif_msg_len(&ssif_bmc->request), sizeof(struct ssif_msg))) { + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + ret = -EINVAL; + } else { + count = min_t(ssize_t, ssif_msg_len(&ssif_bmc->request), sizeof(struct ssif_msg)); + memcpy(&msg, &ssif_bmc->request, count); + ssif_bmc->request_available = false; + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + + ret = copy_to_user(buf, &msg, count); + } + + return (ret < 0) ? ret : count; +} + +/* Handle SSIF message that is written by user */ +static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t count, + loff_t *ppos) +{ + struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); + struct ssif_msg msg; + unsigned long flags; + ssize_t ret; + + if (count > sizeof(struct ssif_msg)) + return -EINVAL; + + ret = copy_from_user(&msg, buf, count); + if (ret) + return ret; + + if (!msg.len || count < ssif_msg_len(&msg)) + return -EINVAL; + + spin_lock_irqsave(&ssif_bmc->lock, flags); + while (ssif_bmc->response_in_progress) { + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + ret = wait_event_interruptible(ssif_bmc->wait_queue, + !ssif_bmc->response_in_progress); + if (ret) + return ret; + spin_lock_irqsave(&ssif_bmc->lock, flags); + } + + memcpy(&ssif_bmc->response, &msg, count); + ssif_bmc->is_singlepart_read = (ssif_msg_len(&msg) <= MAX_PAYLOAD_PER_TRANSACTION + 1); + + ssif_bmc->response_in_progress = true; + + /* ssif_bmc not busy */ + ssif_bmc->busy = false; + + if (ssif_bmc->response_timer_inited) { + del_timer(&ssif_bmc->response_timer); + ssif_bmc->response_timer_inited = false; + } + /* Clean old request buffer */ + memset(&ssif_bmc->request, 0, sizeof(struct ssif_msg)); + + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + + return count; +} + +static int ssif_bmc_open(struct inode *inode, struct file *file) +{ + struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); + int ret = 0; + + spin_lock_irq(&ssif_bmc->lock); + if (!ssif_bmc->running) + ssif_bmc->running = 1; + else + ret = -EBUSY; + spin_unlock_irq(&ssif_bmc->lock); + + return ret; +} + +static unsigned int ssif_bmc_poll(struct file *file, poll_table *wait) +{ + struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); + unsigned int mask = 0; + + poll_wait(file, &ssif_bmc->wait_queue, wait); + + spin_lock_irq(&ssif_bmc->lock); + /* The request is available, userspace application can get the request */ + if (ssif_bmc->request_available) + mask |= POLLIN; + + spin_unlock_irq(&ssif_bmc->lock); + + return mask; +} + +static int ssif_bmc_release(struct inode *inode, struct file *file) +{ + struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); + + spin_lock_irq(&ssif_bmc->lock); + ssif_bmc->running = 0; + spin_unlock_irq(&ssif_bmc->lock); + + return 0; +} + +/* + * System calls to device interface for user apps + */ +static const struct file_operations ssif_bmc_fops = { + .owner = THIS_MODULE, + .open = ssif_bmc_open, + .read = ssif_bmc_read, + .write = ssif_bmc_write, + .release = ssif_bmc_release, + .poll = ssif_bmc_poll, +}; + +/* Called with ssif_bmc->lock held. */ +static void complete_response(struct ssif_bmc_ctx *ssif_bmc) +{ + /* Invalidate response in buffer to denote it having been sent. */ + ssif_bmc->response.len = 0; + ssif_bmc->response_in_progress = false; + ssif_bmc->nbytes_processed = 0; + ssif_bmc->remain_len = 0; + ssif_bmc->busy = false; + memset(&ssif_bmc->response_buf, 0, MAX_PAYLOAD_PER_TRANSACTION); + wake_up_all(&ssif_bmc->wait_queue); +} + +static void response_timeout(struct timer_list *t) +{ + struct ssif_bmc_ctx *ssif_bmc = from_timer(ssif_bmc, t, response_timer); + unsigned long flags; + + spin_lock_irqsave(&ssif_bmc->lock, flags); + + /* Recover ssif_bmc from busy */ + ssif_bmc->busy = false; + del_timer(&ssif_bmc->response_timer); + ssif_bmc->response_timer_inited = false; + + spin_unlock_irqrestore(&ssif_bmc->lock, flags); +} + +/* Called with ssif_bmc->lock held. */ +static void handle_request(struct ssif_bmc_ctx *ssif_bmc) +{ + /* set ssif_bmc to busy waiting for response */ + ssif_bmc->busy = true; + + /* Request message is available to process */ + ssif_bmc->request_available = true; + + /* Clean old response buffer */ + memset(&ssif_bmc->response, 0, sizeof(struct ssif_msg)); + + /* This is the new READ request.*/ + wake_up_all(&ssif_bmc->wait_queue); + + /* Armed timer to recover slave from busy state in case of no response */ + if (!ssif_bmc->response_timer_inited) { + timer_setup(&ssif_bmc->response_timer, response_timeout, 0); + ssif_bmc->response_timer_inited = true; + } + mod_timer(&ssif_bmc->response_timer, jiffies + msecs_to_jiffies(RESPONSE_TIMEOUT)); +} + +static void set_multipart_response_buffer(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + u8 response_len = 0; + int idx = 0; + u8 data_len; + + data_len = ssif_bmc->response.len; + switch (ssif_bmc->smbus_cmd) { + case SSIF_IPMI_MULTIPART_READ_START: + /* + * Read Start length is 32 bytes. + * Read Start transfer first 30 bytes of IPMI response + * and 2 special code 0x00, 0x01. + */ + *val = MAX_PAYLOAD_PER_TRANSACTION; + ssif_bmc->remain_len = data_len - MAX_IPMI_DATA_PER_START_TRANSACTION; + ssif_bmc->block_num = 0; + + ssif_bmc->response_buf[idx++] = 0x00; /* Start Flag */ + ssif_bmc->response_buf[idx++] = 0x01; /* Start Flag */ + ssif_bmc->response_buf[idx++] = ssif_bmc->response.netfn_lun; + ssif_bmc->response_buf[idx++] = ssif_bmc->response.cmd; + ssif_bmc->response_buf[idx++] = ssif_bmc->response.payload[0]; + + response_len = MAX_PAYLOAD_PER_TRANSACTION - idx; + + memcpy(&ssif_bmc->response_buf[idx], &ssif_bmc->response.payload[1], + response_len); + break; + + case SSIF_IPMI_MULTIPART_READ_MIDDLE: + /* + * IPMI READ Middle or READ End messages can carry up to 31 bytes + * IPMI data plus block number byte. + */ + if (ssif_bmc->remain_len < MAX_IPMI_DATA_PER_MIDDLE_TRANSACTION) { + /* + * This is READ End message + * Return length is the remaining response data length + * plus block number + * Block number 0xFF is to indicate this is last message + * + */ + *val = ssif_bmc->remain_len + 1; + ssif_bmc->block_num = 0xFF; + ssif_bmc->response_buf[idx++] = ssif_bmc->block_num; + response_len = ssif_bmc->remain_len; + /* Clean the buffer */ + memset(&ssif_bmc->response_buf[idx], 0, MAX_PAYLOAD_PER_TRANSACTION - idx); + } else { + /* + * This is READ Middle message + * Response length is the maximum SMBUS transfer length + * Block number byte is incremented + * Return length is maximum SMBUS transfer length + */ + *val = MAX_PAYLOAD_PER_TRANSACTION; + ssif_bmc->remain_len -= MAX_IPMI_DATA_PER_MIDDLE_TRANSACTION; + response_len = MAX_IPMI_DATA_PER_MIDDLE_TRANSACTION; + ssif_bmc->response_buf[idx++] = ssif_bmc->block_num; + ssif_bmc->block_num++; + } + + memcpy(&ssif_bmc->response_buf[idx], + ssif_bmc->response.payload + 1 + ssif_bmc->nbytes_processed, + response_len); + break; + + default: + /* Do not expect to go to this case */ + dev_err(&ssif_bmc->client->dev, + "%s: Unexpected SMBus command 0x%x\n", + __func__, ssif_bmc->smbus_cmd); + break; + } + + ssif_bmc->nbytes_processed += response_len; +} + +/* Process the IPMI response that will be read by master */ +static void handle_read_processed(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + u8 *buf; + u8 pec_len, addr, len; + u8 pec = 0; + + pec_len = ssif_bmc->pec_support ? 1 : 0; + /* PEC - Start Read Address */ + addr = GET_8BIT_ADDR(ssif_bmc->client->addr); + pec = i2c_smbus_pec(pec, &addr, 1); + /* PEC - SSIF Command */ + pec = i2c_smbus_pec(pec, &ssif_bmc->smbus_cmd, 1); + /* PEC - Restart Write Address */ + addr = addr | 0x01; + pec = i2c_smbus_pec(pec, &addr, 1); + + if (ssif_bmc->is_singlepart_read) { + /* Single-part Read processing */ + buf = (u8 *)&ssif_bmc->response; + + if (ssif_bmc->response.len && ssif_bmc->msg_idx < ssif_bmc->response.len) { + ssif_bmc->msg_idx++; + *val = buf[ssif_bmc->msg_idx]; + } else if (ssif_bmc->response.len && ssif_bmc->msg_idx == ssif_bmc->response.len) { + ssif_bmc->msg_idx++; + *val = i2c_smbus_pec(pec, buf, ssif_msg_len(&ssif_bmc->response)); + } else { + *val = 0; + } + /* Invalidate response buffer to denote it is sent */ + if (ssif_bmc->msg_idx + 1 >= (ssif_msg_len(&ssif_bmc->response) + pec_len)) + complete_response(ssif_bmc); + } else { + /* Multi-part Read processing */ + switch (ssif_bmc->smbus_cmd) { + case SSIF_IPMI_MULTIPART_READ_START: + case SSIF_IPMI_MULTIPART_READ_MIDDLE: + buf = (u8 *)&ssif_bmc->response_buf; + *val = buf[ssif_bmc->msg_idx]; + ssif_bmc->msg_idx++; + break; + default: + /* Do not expect to go to this case */ + dev_err(&ssif_bmc->client->dev, + "%s: Unexpected SMBus command 0x%x\n", + __func__, ssif_bmc->smbus_cmd); + break; + } + + len = (ssif_bmc->block_num == 0xFF) ? + ssif_bmc->remain_len + 1 : MAX_PAYLOAD_PER_TRANSACTION; + if (ssif_bmc->msg_idx == (len + 1)) { + pec = i2c_smbus_pec(pec, &len, 1); + *val = i2c_smbus_pec(pec, ssif_bmc->response_buf, len); + } + /* Invalidate response buffer to denote last response is sent */ + if (ssif_bmc->block_num == 0xFF && + ssif_bmc->msg_idx > (ssif_bmc->remain_len + pec_len)) { + complete_response(ssif_bmc); + } + } +} + +static void handle_write_received(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + u8 *buf = (u8 *)&ssif_bmc->request; + + if (ssif_bmc->msg_idx >= sizeof(struct ssif_msg)) + return; + + switch (ssif_bmc->smbus_cmd) { + case SSIF_IPMI_SINGLEPART_WRITE: + buf[ssif_bmc->msg_idx - 1] = *val; + ssif_bmc->msg_idx++; + + break; + case SSIF_IPMI_MULTIPART_WRITE_START: + if (ssif_bmc->msg_idx == 1) + ssif_bmc->request.len = 0; + + fallthrough; + case SSIF_IPMI_MULTIPART_WRITE_MIDDLE: + /* The len should always be 32 */ + if (ssif_bmc->msg_idx == 1 && *val != MAX_PAYLOAD_PER_TRANSACTION) + dev_warn(&ssif_bmc->client->dev, + "Warn: Invalid Multipart Write len"); + + fallthrough; + case SSIF_IPMI_MULTIPART_WRITE_END: + /* Multi-part write, 2nd byte received is length */ + if (ssif_bmc->msg_idx == 1) { + if (*val > MAX_PAYLOAD_PER_TRANSACTION) + dev_warn(&ssif_bmc->client->dev, + "Warn: Invalid Multipart Write End len"); + + ssif_bmc->request.len += *val; + ssif_bmc->recv_len = *val; + + /* request len should never exceeded 255 bytes */ + if (ssif_bmc->request.len > 255) + dev_warn(&ssif_bmc->client->dev, + "Warn: Invalid request len"); + + } else { + buf[ssif_bmc->msg_idx - 1 + + ssif_bmc->request.len - ssif_bmc->recv_len] = *val; + } + + ssif_bmc->msg_idx++; + + break; + default: + /* Do not expect to go to this case */ + dev_err(&ssif_bmc->client->dev, + "%s: Unexpected SMBus command 0x%x\n", + __func__, ssif_bmc->smbus_cmd); + break; + } +} + +static bool validate_request(struct ssif_bmc_ctx *ssif_bmc) +{ + u8 rpec = 0, cpec = 0; + bool ret = true; + u8 addr, index; + u8 *buf; + + buf = (u8 *)&ssif_bmc->request; + switch (ssif_bmc->smbus_cmd) { + case SSIF_IPMI_SINGLEPART_WRITE: + if ((ssif_bmc->msg_idx - 1) == ssif_msg_len(&ssif_bmc->request)) { + /* PEC is not included */ + ssif_bmc->pec_support = false; + ret = true; + goto exit; + } + + if ((ssif_bmc->msg_idx - 1) != (ssif_msg_len(&ssif_bmc->request) + 1)) { + dev_err(&ssif_bmc->client->dev, "Error: Unexpected length received %d\n", + ssif_msg_len(&ssif_bmc->request)); + ret = false; + goto exit; + } + + /* PEC is included */ + ssif_bmc->pec_support = true; + rpec = buf[ssif_bmc->msg_idx - 2]; + addr = GET_8BIT_ADDR(ssif_bmc->client->addr); + cpec = i2c_smbus_pec(cpec, &addr, 1); + cpec = i2c_smbus_pec(cpec, &ssif_bmc->smbus_cmd, 1); + cpec = i2c_smbus_pec(cpec, buf, ssif_msg_len(&ssif_bmc->request)); + if (rpec != cpec) { + dev_err(&ssif_bmc->client->dev, "Bad PEC 0x%02x vs. 0x%02x\n", rpec, cpec); + ret = false; + } + + break; + case SSIF_IPMI_MULTIPART_WRITE_START: + case SSIF_IPMI_MULTIPART_WRITE_MIDDLE: + case SSIF_IPMI_MULTIPART_WRITE_END: + index = ssif_bmc->request.len - ssif_bmc->recv_len; + if ((ssif_bmc->msg_idx - 1 + index) == ssif_msg_len(&ssif_bmc->request)) { + /* PEC is not included */ + ssif_bmc->pec_support = false; + ret = true; + goto exit; + } + + if ((ssif_bmc->msg_idx - 1 + index) != (ssif_msg_len(&ssif_bmc->request) + 1)) { + dev_err(&ssif_bmc->client->dev, "Error: Unexpected length received %d\n", + ssif_msg_len(&ssif_bmc->request)); + ret = false; + goto exit; + } + + /* PEC is included */ + ssif_bmc->pec_support = true; + rpec = buf[ssif_bmc->msg_idx - 2 + index]; + addr = GET_8BIT_ADDR(ssif_bmc->client->addr); + cpec = i2c_smbus_pec(cpec, &addr, 1); + cpec = i2c_smbus_pec(cpec, &ssif_bmc->smbus_cmd, 1); + cpec = i2c_smbus_pec(cpec, &ssif_bmc->recv_len, 1); + /* As SMBus specification does not allow the length + * (byte count) in the Write-Block protocol to be zero. + * Therefore, it is illegal to have the last Middle + * transaction in the sequence carry 32-byte and have + * a length of ‘0’ in the End transaction. + * But some users may try to use this way and we should + * prevent ssif_bmc driver broken in this case. + */ + if (ssif_bmc->recv_len != 0) + cpec = i2c_smbus_pec(cpec, buf + 1 + index, ssif_bmc->recv_len); + + if (rpec != cpec) { + dev_err(&ssif_bmc->client->dev, "Bad PEC 0x%02x vs. 0x%02x\n", rpec, cpec); + ret = false; + } + + break; + default: + /* Do not expect to go to this case */ + dev_err(&ssif_bmc->client->dev, "%s: Unexpected SMBus command 0x%x\n", + __func__, ssif_bmc->smbus_cmd); + ret = false; + break; + } + +exit: + return ret; +} + +static bool unsupported_smbus_cmd(u8 cmd) +{ + if (cmd == SSIF_IPMI_SINGLEPART_READ || + cmd == SSIF_IPMI_SINGLEPART_WRITE || + cmd == SSIF_IPMI_MULTIPART_WRITE_START || + cmd == SSIF_IPMI_MULTIPART_WRITE_MIDDLE || + cmd == SSIF_IPMI_MULTIPART_WRITE_END || + cmd == SSIF_IPMI_MULTIPART_READ_START || + cmd == SSIF_IPMI_MULTIPART_READ_MIDDLE) + return false; + + return true; +} + +static void process_smbus_cmd(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + /* SMBUS command can vary (single or multi-part) */ + ssif_bmc->smbus_cmd = *val; + ssif_bmc->msg_idx++; + + if (unsupported_smbus_cmd(*val)) + dev_warn(&ssif_bmc->client->dev, "Warn: Unknown SMBus command"); + + if (*val == SSIF_IPMI_SINGLEPART_WRITE || + *val == SSIF_IPMI_MULTIPART_WRITE_START) { + /* + * The response maybe not come in-time, causing host SSIF driver + * to timeout and resend a new request. In such case check for + * pending response and clear it + */ + if (ssif_bmc->response_in_progress) + complete_response(ssif_bmc); + } +} + +static void on_read_requested_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + if (ssif_bmc->state == SSIF_READY || + ssif_bmc->state == SSIF_START || + ssif_bmc->state == SSIF_REQ_RECVING || + ssif_bmc->state == SSIF_RES_SENDING) { + ssif_bmc->state = SSIF_BAD_SMBUS; + dev_warn(&ssif_bmc->client->dev, + "Warn: %s unexpected READ REQUESTED in state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + + } else if (ssif_bmc->state == SSIF_SMBUS_CMD) { + ssif_bmc->state = SSIF_RES_SENDING; + } + + ssif_bmc->msg_idx = 0; + if (ssif_bmc->is_singlepart_read) + *val = ssif_bmc->response.len; + else + set_multipart_response_buffer(ssif_bmc, val); +} + +static void on_read_processed_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + if (ssif_bmc->state == SSIF_READY || + ssif_bmc->state == SSIF_START || + ssif_bmc->state == SSIF_REQ_RECVING || + ssif_bmc->state == SSIF_SMBUS_CMD) { + dev_warn(&ssif_bmc->client->dev, + "Warn: %s unexpected READ PROCESSED in state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + ssif_bmc->state = SSIF_BAD_SMBUS; + } + + handle_read_processed(ssif_bmc, val); +} + +static void on_write_requested_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + ssif_bmc->msg_idx = 0; + + if (ssif_bmc->state == SSIF_READY || ssif_bmc->state == SSIF_SMBUS_CMD) { + ssif_bmc->state = SSIF_START; + + } else if (ssif_bmc->state == SSIF_START || + ssif_bmc->state == SSIF_REQ_RECVING || + ssif_bmc->state == SSIF_RES_SENDING) { + dev_warn(&ssif_bmc->client->dev, + "Warn: %s unexpected WRITE REQUEST in state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + ssif_bmc->state = SSIF_BAD_SMBUS; + } +} + +static void on_write_received_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + if (ssif_bmc->state == SSIF_READY || ssif_bmc->state == SSIF_RES_SENDING) { + dev_warn(&ssif_bmc->client->dev, + "Warn: %s unexpected WRITE RECEIVED in state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + ssif_bmc->state = SSIF_BAD_SMBUS; + } else if (ssif_bmc->state == SSIF_START) { + ssif_bmc->state = SSIF_SMBUS_CMD; + } else if (ssif_bmc->state == SSIF_SMBUS_CMD) { + ssif_bmc->state = SSIF_REQ_RECVING; + } + + /* This is response sending state */ + if (ssif_bmc->state == SSIF_REQ_RECVING) + handle_write_received(ssif_bmc, val); + else if (ssif_bmc->state == SSIF_SMBUS_CMD) + process_smbus_cmd(ssif_bmc, val); +} + +static void on_stop_event(struct ssif_bmc_ctx *ssif_bmc, u8 *val) +{ + if (ssif_bmc->state == SSIF_READY || + ssif_bmc->state == SSIF_START || + ssif_bmc->state == SSIF_SMBUS_CMD) { + dev_warn(&ssif_bmc->client->dev, + "Warn: %s unexpected SLAVE STOP in state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + + } else if (ssif_bmc->state == SSIF_BAD_SMBUS) { + dev_warn(&ssif_bmc->client->dev, + "Warn: %s received SLAVE STOP from bad state=%s\n", + __func__, state_to_string(ssif_bmc->state)); + + } else if (ssif_bmc->state == SSIF_REQ_RECVING) { + /* A BMC that receives an invalid request drop the data for the write + * transaction and any further transactions (read or write) until + * the next valid read or write Start transaction is received + */ + if (!validate_request(ssif_bmc)) + dev_err(&ssif_bmc->client->dev, "Error: invalid pec\n"); + else if (ssif_bmc->smbus_cmd == SSIF_IPMI_SINGLEPART_WRITE || + ssif_bmc->smbus_cmd == SSIF_IPMI_MULTIPART_WRITE_END) + handle_request(ssif_bmc); + } + + ssif_bmc->state = SSIF_READY; + /* Reset message index */ + ssif_bmc->msg_idx = 0; +} + +/* + * Callback function to handle I2C slave events + */ +static int ssif_bmc_cb(struct i2c_client *client, enum i2c_slave_event event, u8 *val) +{ + unsigned long flags; + struct ssif_bmc_ctx *ssif_bmc = i2c_get_clientdata(client); + int ret = 0; + + spin_lock_irqsave(&ssif_bmc->lock, flags); + + switch (event) { + case I2C_SLAVE_READ_REQUESTED: + on_read_requested_event(ssif_bmc, val); + break; + + case I2C_SLAVE_WRITE_REQUESTED: + on_write_requested_event(ssif_bmc, val); + break; + + case I2C_SLAVE_READ_PROCESSED: + on_read_processed_event(ssif_bmc, val); + break; + + case I2C_SLAVE_WRITE_RECEIVED: + on_write_received_event(ssif_bmc, val); + break; + + case I2C_SLAVE_STOP: + on_stop_event(ssif_bmc, val); + break; + + default: + dev_warn(&ssif_bmc->client->dev, "Warn: Unknown i2c slave event\n"); + break; + } + + if (ssif_bmc->busy) + ret = -EBUSY; + + spin_unlock_irqrestore(&ssif_bmc->lock, flags); + + return ret; +} + +static int ssif_bmc_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct ssif_bmc_ctx *ssif_bmc; + int ret; + + ssif_bmc = devm_kzalloc(&client->dev, sizeof(*ssif_bmc), GFP_KERNEL); + if (!ssif_bmc) + return -ENOMEM; + + spin_lock_init(&ssif_bmc->lock); + + init_waitqueue_head(&ssif_bmc->wait_queue); + ssif_bmc->request_available = false; + ssif_bmc->response_in_progress = false; + ssif_bmc->busy = false; + ssif_bmc->response_timer_inited = false; + + /* Register misc device interface */ + ssif_bmc->miscdev.minor = MISC_DYNAMIC_MINOR; + ssif_bmc->miscdev.name = DEVICE_NAME; + ssif_bmc->miscdev.fops = &ssif_bmc_fops; + ssif_bmc->miscdev.parent = &client->dev; + ret = misc_register(&ssif_bmc->miscdev); + if (ret) + goto out; + + ssif_bmc->client = client; + ssif_bmc->client->flags |= I2C_CLIENT_SLAVE; + + /* Register I2C slave */ + i2c_set_clientdata(client, ssif_bmc); + ret = i2c_slave_register(client, ssif_bmc_cb); + if (ret) { + misc_deregister(&ssif_bmc->miscdev); + goto out; + } + + return 0; +out: + devm_kfree(&client->dev, ssif_bmc); + return ret; +} + +static int ssif_bmc_remove(struct i2c_client *client) +{ + struct ssif_bmc_ctx *ssif_bmc = i2c_get_clientdata(client); + + i2c_slave_unregister(client); + misc_deregister(&ssif_bmc->miscdev); + + return 0; +} + +static const struct of_device_id ssif_bmc_match[] = { + { .compatible = "ampere,ssif-bmc" }, + { }, +}; + +static const struct i2c_device_id ssif_bmc_id[] = { + { DEVICE_NAME, 0 }, + { }, +}; + +MODULE_DEVICE_TABLE(i2c, ssif_bmc_id); + +static struct i2c_driver ssif_bmc_driver = { + .driver = { + .name = DEVICE_NAME, + .of_match_table = ssif_bmc_match, + }, + .probe = ssif_bmc_probe, + .remove = ssif_bmc_remove, + .id_table = ssif_bmc_id, +}; + +module_i2c_driver(ssif_bmc_driver); + +MODULE_AUTHOR("Quan Nguyen "); +MODULE_AUTHOR("Chuong Tran "); +MODULE_DESCRIPTION("Linux device driver of the BMC IPMI SSIF interface."); +MODULE_LICENSE("GPL"); diff --git a/drivers/char/ipmi/ssif_bmc.h b/drivers/char/ipmi/ssif_bmc.h new file mode 100644 index 000000000000..9a26f3c252cc --- /dev/null +++ b/drivers/char/ipmi/ssif_bmc.h @@ -0,0 +1,102 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * The driver for BMC side of SSIF interface + * + * Copyright (c) 2022, Ampere Computing LLC + * + */ +#ifndef __SSIF_BMC_H__ +#define __SSIF_BMC_H__ + +#define DEVICE_NAME "ipmi-ssif-host" + +#define GET_8BIT_ADDR(addr_7bit) (((addr_7bit) << 1) & 0xff) + +/* A standard SMBus Transaction is limited to 32 data bytes */ +#define MAX_PAYLOAD_PER_TRANSACTION 32 + +#define MAX_IPMI_DATA_PER_START_TRANSACTION 30 +#define MAX_IPMI_DATA_PER_MIDDLE_TRANSACTION 31 + +#define SSIF_IPMI_SINGLEPART_WRITE 0x2 +#define SSIF_IPMI_SINGLEPART_READ 0x3 +#define SSIF_IPMI_MULTIPART_WRITE_START 0x6 +#define SSIF_IPMI_MULTIPART_WRITE_MIDDLE 0x7 +#define SSIF_IPMI_MULTIPART_WRITE_END 0x8 +#define SSIF_IPMI_MULTIPART_READ_START 0x3 +#define SSIF_IPMI_MULTIPART_READ_MIDDLE 0x9 + +#define MSG_PAYLOAD_LEN_MAX 252 +/* + * IPMI 2.0 Spec, section 12.7 SSIF Timing, + * Request-to-Response Time is T6max(250ms) - T1max(20ms) - 3ms = 227ms + * Recover ssif_bmc from busy state if it takes upto 500ms + */ +#define RESPONSE_TIMEOUT 500 /* ms */ + +struct ssif_msg { + u8 len; + u8 netfn_lun; + u8 cmd; + u8 payload[MSG_PAYLOAD_LEN_MAX]; +} __packed; + +static inline u32 ssif_msg_len(struct ssif_msg *ssif_msg) +{ + return ssif_msg->len + 1; +} + +/* + * SSIF internal states: + * SSIF_READY 0x00 : Ready state + * SSIF_START 0x01 : Start smbus transaction + * SSIF_SMBUS_CMD 0x02 : Received SMBus command + * SSIF_REQ_RECVING 0x03 : Receiving request + * SSIF_RES_SENDING 0x04 : Sending response + * SSIF_BAD_SMBUS 0x05 : Bad SMbus transaction + */ +enum ssif_state { + SSIF_READY, + SSIF_START, + SSIF_SMBUS_CMD, + SSIF_REQ_RECVING, + SSIF_RES_SENDING, + SSIF_BAD_SMBUS, + SSIF_STATE_MAX +}; + +struct ssif_bmc_ctx { + struct i2c_client *client; + struct miscdevice miscdev; + size_t msg_idx; + bool pec_support; + /* ssif bmc spinlock */ + spinlock_t lock; + wait_queue_head_t wait_queue; + u8 running; + enum ssif_state state; + u8 smbus_cmd; + /* Timeout waiting for response */ + struct timer_list response_timer; + bool response_timer_inited; + /* Flag to identify a Multi-part Read Transaction */ + bool is_singlepart_read; + u8 nbytes_processed; + u8 remain_len; + u8 recv_len; + /* Block Number of a Multi-part Read Transaction */ + u8 block_num; + bool request_available; + bool response_in_progress; + bool busy; + /* Response buffer for Multi-part Read Transaction */ + u8 response_buf[MAX_PAYLOAD_PER_TRANSACTION]; + struct ssif_msg response; + struct ssif_msg request; +}; + +static inline struct ssif_bmc_ctx *to_ssif_bmc(struct file *file) +{ + return container_of(file->private_data, struct ssif_bmc_ctx, miscdev); +} +#endif /* __SSIF_BMC_H__ */ -- 2.35.1