From patchwork Wed Apr 9 11:26:29 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: jesse huang X-Patchwork-Id: 879427 Received: from HK3PR03CU002.outbound.protection.outlook.com (mail-eastasiaazon11021136.outbound.protection.outlook.com [52.101.129.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECDB3450FE; Wed, 9 Apr 2025 11:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.129.136 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744198001; cv=fail; b=UKlGvREadZ13BbnSC8SCHOniA0lSWPEEOXmVhUn6wZ3K4dJhyZo1nRT6ndnYmPaeYsneNl9Xf3bYG7Xg2cauQazdisAcgpoF2k8aLoaotCegx283jtiu07pNkWKJQErpMhhVkHgq8EQEovpwi2BMWvAuW9uV2r5q0BIca58QveU= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744198001; c=relaxed/simple; bh=X0d35a/dwBxswa2Py3B3mdntNB1qQQcc77oOozLOBBE=; h=Message-ID:Date:To:Cc:From:Subject:Content-Type:MIME-Version; b=o78otd19uHuvCq8Jeo+w90dPuk2YUpY4vy6ORrVRLLN+e9Feu6oeqqrLbpYvSM7Cm5LTN1KG/8x2eYoUDm9rnaUHiAMh+Hlou2yIXmWUgLr98uZcAl+OMXFsuW4rZtXiqVTXgByBJJX2dWmA+NJJBnxV86EkxAWA955D+G3IIEg= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=portwell.com.tw; spf=pass smtp.mailfrom=portwell.com.tw; dkim=pass (2048-bit key) header.d=fetCA905017.onmicrosoft.com header.i=@fetCA905017.onmicrosoft.com header.b=TEYbFU3n; arc=fail smtp.client-ip=52.101.129.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=portwell.com.tw Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=portwell.com.tw Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fetCA905017.onmicrosoft.com header.i=@fetCA905017.onmicrosoft.com header.b="TEYbFU3n" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=afEyC8aOR4J4LWmJd40I8wKMrvB9MeeF9QNgFxlirtILrbm9+nR86YdE0j4/QRFFjp3iHt33Xw6ESpmSlRXaYkwSaQvlMt1C5wZfYJE+413U4rc1NFjepjnlMc0d1k3F9DUjcFtzF+cjh5MCgZ9zlaa98b/WQk0f6e2EaQJAYuzyFac7rC5z/2RhAH+sCpd3zKRAQ3eemPi2wLa97l3DAV7d74GTi2dLT7dIk6V+34AAtHY00+ZiIpEwOiI9xUu538qQ58mMhPoGP+QitE8W0FAumWZtB7VHS/m90G0txmN8RUddKvXL7ryPJxVPXrammxtEmuZ74DhJNltR6xl99Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=JwEO3Z4Zo2E5VX6iR3hCfldYfFNMnwPJeZGiLi+CjiU=; b=YUj5Z2WvSlhwpvpbJ6NLFZ6D1q5+Y+42P56t64SpWUqEYCY8udlB2v6ErlF4CHNDNUi8NyT03Zkn/hfV7EL+tr/UvrAo1Ohli+fxYAZQ3JHkuIdJw/n5hia1BSk6wj/gP6vfk2kjCzfOKHsGNW4hYP6wAIckHSaQ42B7daaEHk9Nc5T5rDAAnstPa3du2H2SzhKZBIB55sIxEMqadc4Ha1DS6Bs4mY012JRIMm0RPHsVRRg3EhLep9V3gRW3I/EotBDAXutb6BT+wxOJFn5e+ADKmNFi1UhZl2e86RtMmJ7znXkfMgShZ803VUxu0ItBMOrxmGZtsxpA8vNO+lj5aw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=portwell.com.tw; dmarc=pass action=none header.from=portwell.com.tw; dkim=pass header.d=portwell.com.tw; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fetCA905017.onmicrosoft.com; s=selector1-fetCA905017-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=JwEO3Z4Zo2E5VX6iR3hCfldYfFNMnwPJeZGiLi+CjiU=; b=TEYbFU3ndttA9JSg7HL9OQyyeFuBEkCemgGoQdtsxFPgZkrTM2QxGNM2Mc5f0Xhopdjm3puFWVhAjvffqukuuixL3vKjvszk5lrEf4SKQ14SLRKjnnYpJEcRZIOiG66sjp8Rjigo5c9FL6UHzgJmp09h/hd/a7At1vPOInQYRuJY/8amg52ctZS4YXHMuIDioFtQqDiPV1TsFSRsvNC9K4S7NGpIF17DgJz+iTq0lk39jbCul48bpEO+/atFz2sreHYEhksgSBYxg0IPu+r9J+6srgnvt6VVznOgLdrwd+nebRFL95tw89HbkizICvSeUJZdLS10alu2hvTEG+cL0g== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=portwell.com.tw; Received: from KL1PR06MB6395.apcprd06.prod.outlook.com (2603:1096:820:e7::10) by SEZPR06MB6205.apcprd06.prod.outlook.com (2603:1096:101:f1::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8606.29; Wed, 9 Apr 2025 11:26:32 +0000 Received: from KL1PR06MB6395.apcprd06.prod.outlook.com ([fe80::9235:5570:71b3:224]) by KL1PR06MB6395.apcprd06.prod.outlook.com ([fe80::9235:5570:71b3:224%5]) with mapi id 15.20.8606.029; Wed, 9 Apr 2025 11:26:32 +0000 Message-ID: Date: Wed, 9 Apr 2025 19:26:29 +0800 User-Agent: Mozilla Thunderbird Content-Language: en-US To: hdegoede@redhat.com, ilpo.jarvinen@linux.intel.com, linus.walleij@linaro.org, brgl@bgdev.pl, wim@linux-watchdog.org, linux@roeck-us.net Cc: linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-gpio@vger.kernel.org, linux-watchdog@vger.kernel.org, jay.chen@canonical.com, jesse.huang@portwell.com.tw From: Yen-Chi Huang Subject: [PATCH v2] platform/x86: portwell-ec: Add GPIO and WDT driver for Portwell EC X-ClientProxiedBy: TP0P295CA0056.TWNP295.PROD.OUTLOOK.COM (2603:1096:910:3::7) To KL1PR06MB6395.apcprd06.prod.outlook.com (2603:1096:820:e7::10) Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: KL1PR06MB6395:EE_|SEZPR06MB6205:EE_ X-MS-Office365-Filtering-Correlation-Id: f9b59d7b-05d4-4c32-b2e3-08dd77596132 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; X-Microsoft-Antispam-Message-Info: =?utf-8?q?RDa++UcfF9qPZK7EzspoNh9pxIBvlBw?= =?utf-8?q?MpEtQfWS0hP/TDXDwUQ8ziEDFOMKgLrJGNaGp5/wnn5MBW0gP1PzXV7BEm8JWzby0?= =?utf-8?q?kzuy4mfb+AyWRYzIwgyG8PaHW3WUznmwJqXmYWRNXEQurd1VFR9wX9oZwBNMUbZ4Z?= =?utf-8?q?kyl83J17ypYCW8NtjM3b+F+XyTNZ4NKL29C+8TzMDgDZAvC+/byRwyPOMDs73vESP?= =?utf-8?q?tSNokd6JTceivdZfNPHnSlY4l7UwQ33iitmwhN4PWJp06Kdhu/JmCtU+iHllinlRV?= =?utf-8?q?RdKRJ2jW5zUtfgXcmZl7SRApmWZbXx8kuPMv1+76m8ipTLnw9mHyTGoqM8UfFDh2r?= =?utf-8?q?T3Tnq1bAQOeNqhyN5pn7OO3pyzwfsu57bZ57a7HiWfxfPBZavr0eyqeZxc6k0rwUK?= =?utf-8?q?vzG+qOZWEoCE2TGkTG2x2rgAmzBKmA12cksqe6ChnY/x+ubWCGGCM5v/0IuLXfLJG?= =?utf-8?q?rHhljHP6nPVwR1edSOQW/bQGijVKXCLfGu36ffGTfpBVyAm+FRbhFWrYgUxyaba3z?= =?utf-8?q?3CI5lTAMC0MxnY3UvkAoJTwQVv/EBQegzHMGOHSCkAc3yFTM+h218GIOQQP+x0W8M?= =?utf-8?q?3NFLu1rp5Lbi5wyJq0umPiMKw0+qIEJfZKfbTujQbWxZSG1MSPNo+L+6Bi+kaUgbp?= =?utf-8?q?Z6JUwRo6HemTwpmTAKhkso2X/wBDgLv0VQBPi+MfB9CtKz4GXxgKkkgbShOkeeo/w?= =?utf-8?q?++Nm7r8NykXiJz95FmwwUXqugTwVPpUSqyhMtK6TvmKFjcxgqxHfpmwVr//ZwXtfl?= =?utf-8?q?xdbTL7AKzLs2JNBBcd8k7et1cKOfgwHbzFBlnzLJ7NJK20WZZPwvuV8biLd5LbeSE?= =?utf-8?q?JScHoMl4jFGDDKP0Sugt6TQjfAbWQqEjBfZ9S7shvsux3atrR2btYHonyorsiC+7J?= =?utf-8?q?GimUI1NwlDknVlbDSqy9xJED5DPG/fexD+1ZsV7/WRXJ5frWaMj4Pn0DMi8EIuE+8?= =?utf-8?q?VSd1H03Gj7CV7kZkjZc4KENU8Jo10MvPthvn+87fzj5pkVQaLdPbTFcjJ8a6jCiPP?= =?utf-8?q?BxlKLLtZl3RYfoDcwVrk2B0GKal6pJGMqWExE1f/i3FxO4SlLsw5+jGPbXfWnXy1I?= =?utf-8?q?LqG05kD74xTgRpo0jyZAcd2AOzBxZXVy1vc/KlMOGWZ5lBXfPH6UItRIar2g7kzXc?= =?utf-8?q?vQWehmUp34/8DHwjLWJ2euN4DRkHpuh7Ek5ETLPJygBLxBMj+RAZzsj4vi5qqmSmt?= =?utf-8?q?da4PCBxbP2LBSkLlf6GOlo2AZfGWGXlYl1jslga/po6EEuBRims8h18uYTsvk8obO?= =?utf-8?q?yRzFWgUOf54dDmuuEiq1K8pi92RzImHvhhCCax14uNZqju5LHPaSzOvljWUq/LubG?= =?utf-8?q?ZvLFzW/nDAWB?= X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:KL1PR06MB6395.apcprd06.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(1800799024)(366016)(376014)(7416014); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?cuNcZ7+26YmcytMqRyF4USEqydo8?= =?utf-8?q?IvIWnKppm/0GbazNo0MNUbPriSXf0pX5ik/5hG2+unyC7+UW5geZdDC1HD8GW8/sa?= =?utf-8?q?RJlnmwp6YeQuEqGTHNPuFXF/+8PJiwyxQdDXF28QGYLKRgwFqAOPC08MzG05VZcbC?= =?utf-8?q?xHMQq8En0shZ2OxV53uNeUyQgeMQPOyKV6ZDoCOQD9QTxat+9E2UWMEnOpb490ZBV?= =?utf-8?q?kzz2lp2i2n/oD+U8A2aJsLZXfLxjgUFGKLpRqh9lJ1pJQtaFb/aloz6ju4SPmU8kL?= =?utf-8?q?nGBjs2GGB67omW9WCwvs3+0hwgoiUSe61AR3PFf0VTNSKZVCPA+oebZdQrAD2/wXj?= =?utf-8?q?4N5l7hZYqdheza4w+fYmH0I0RdDAUVcaZiiYAMG2P5vmI8xaUxmoLaj1rcuWovv1A?= =?utf-8?q?ZRneu5bh+q3fNMOHQmm8zAZc6UpGyklr+MuUCZP+MEl9cK/m5McfGU28mPCcEQPNd?= =?utf-8?q?mOv4uS26zq05BtTxyQPksQWaUvtnXDwhsu5QEV+fj3vJiVeeE+zp0bJooT+98lMnc?= =?utf-8?q?nd6jN3zMSL6QYHiLQhjbAzufMrDAo8k8bhP9p7XKwwEvIuA4dQy2sKlf/dXUbohcQ?= =?utf-8?q?xz+McrXctvX+x9lt0fb/wuy6kb/5ulpx2vvi4YeutxN5y4r5wHisRasJSfokJxsUu?= =?utf-8?q?zn4lIHWiQe2AFlAChkcNhQKkuq/ApdbfouMOJK089BaSL6Xc4+TQUgo6Dlf8cgohc?= =?utf-8?q?VXctVSbC4QHFlh6aw5VasMAVaGkIXljKnJER7wZmWT8k2LNJPXEkWGwUppksCHvJp?= =?utf-8?q?YUoTwXZy+MlB4oQnFgjwmejz+YtUQfJwhAw+Dfj/68sht25hXOKHV3K11GGs9ztSv?= =?utf-8?q?gDorxqTmGpYa6lhD7NX9dkEyzFFdx/nA+mlBHED6D1etVfn1JTlNV7bpPFBgvvP+p?= =?utf-8?q?TtlrVS99Gga+ZhImK1Y+GdafNNNuetCtxSM4qogdJxjZarT08S8eL40G6yd7dS3VP?= =?utf-8?q?RNPsvhRdqD6zS9hM1iGGMfYgCo7/kethQjQlO7RXQNLZdUEU+75R/emh8gbWUBXnf?= =?utf-8?q?1IGE+9iNaWeO3rV0hBldd5woA/5cwTIYZkviijW1r6OPCgB4pZcvcR2NzvQM2iU+E?= =?utf-8?q?QCfVCdb3963Xbn6sBKds+nMzAu8YENZmk8ADHUUnwKDif5tGwUK9aipU4NHlTDf7Z?= =?utf-8?q?vXztFwRFs7V0hk9od9EGhwyp8BtNKxjP6JkZ3ZlPIpgxhvFaQ67RksGe81usXWvha?= =?utf-8?q?PNzstWLoHcikVVcXk6mQuqUv9bAUoaV13Lu5VxlSZ9ALNeePOCHjGni8edvhShE5H?= =?utf-8?q?DoPMdd6DLDnfV+MTvGOX/0+DSs5Smbex1jjSLqvA3GQqx+z3VaSq0y7jP9djxc9B+?= =?utf-8?q?KigySezCwu9+i2yABtY3mQjn6+L9GJwXErSZsWYK13FSa9EGi2/ZtPzWujiNWAsRo?= =?utf-8?q?31sSqMaFEpvF5D0FdjhYuFyna/1Y/MjNHFvCppJgIvNyoRe2XzHkKbbNL9Nq+jFxn?= =?utf-8?q?0/L2XeL4Vle8R7kzxG9gibHAWQS0LakT55wVUt5Y6EXm/jE48HBZCp0TZANXYbLqn?= =?utf-8?q?018aoWQ1c9ftUFi+bFc6sxBS10pNrBiImg=3D=3D?= X-OriginatorOrg: portwell.com.tw X-MS-Exchange-CrossTenant-Network-Message-Id: f9b59d7b-05d4-4c32-b2e3-08dd77596132 X-MS-Exchange-CrossTenant-AuthSource: KL1PR06MB6395.apcprd06.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Apr 2025 11:26:32.5460 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5e309f7e-c3ee-443b-8668-97701d998b2c X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IddHTuL9QB35RwUJGhqZ3GmsfkUDJW3r3zUVtpnrWJVH7e8nR5KrQwLoMxHd3ZyRXRPgk5uUrY3ml/cRyuvv7Z5Zz/IMv3KJ3ujVzNAd6rs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SEZPR06MB6205 Adds a driver for the ITE Embedded Controller (EC) on Portwell boards. It integrates with the Linux GPIO and watchdog subsystems to provide: - Control/monitoring of up to 8 EC GPIO pins. - Hardware watchdog timer with 1-255 second timeouts. The driver communicates with the EC via I/O port 0xe300 and identifies the hardware by the "PWG" firmware signature. This enables enhanced system management for Portwell embedded/industrial platforms. Signed-off-by: Yen-Chi Huang --- V2: - Add DMI system check to avoid running on unsupported platforms - Add 'force' module parameter to override DMI matching - Use request_region() to claim I/O port access - Extend WDT timeout handling to use both minute and second registers - Increase WDT max timeout from 255s to 15300s - Use named defines for WDT enable/disable - Remove dummy pr_info() messages - Fix several coding style issues (comments, alignment, spacing) --- MAINTAINERS | 6 + drivers/platform/x86/Kconfig | 14 ++ drivers/platform/x86/Makefile | 3 + drivers/platform/x86/portwell-ec.c | 268 +++++++++++++++++++++++++++++ 4 files changed, 291 insertions(+) create mode 100644 drivers/platform/x86/portwell-ec.c diff --git a/MAINTAINERS b/MAINTAINERS index d5dfb9186962..c52f819786dc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19132,6 +19132,12 @@ F: kernel/time/itimer.c F: kernel/time/posix-* F: kernel/time/namespace.c +PORTWELL EC DRIVER +M: Yen-Chi Huang +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/x86/portwell-ec.c + POWER MANAGEMENT CORE M: "Rafael J. Wysocki" L: linux-pm@vger.kernel.org diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 43407e76476b..2f26d1bf0a75 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -779,6 +779,20 @@ config PCENGINES_APU2 To compile this driver as a module, choose M here: the module will be called pcengines-apuv2. +config PORTWELL_EC + tristate "Portwell Embedded Controller driver" + depends on X86 && HAS_IOPORT && WATCHDOG && GPIOLIB + help + This driver provides support for the GPIO pins and watchdog timer + embedded in Portwell's EC. + + Theoretically, this driver should work on multiple Portwell platforms, + but it has only been tested on the Portwell NANO-6064 board. + If you encounter any issues on other boards, please report them. + + To compile this driver as a module, choose M here: the module + will be called portwell-ec. + config BARCO_P50_GPIO tristate "Barco P50 GPIO driver for identify LED/button" depends on GPIOLIB diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 650dfbebb6c8..83dd82e04457 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -92,6 +92,9 @@ obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o # PC Engines obj-$(CONFIG_PCENGINES_APU2) += pcengines-apuv2.o +# Portwell +obj-$(CONFIG_PORTWELL_EC) += portwell-ec.o + # Barco obj-$(CONFIG_BARCO_P50_GPIO) += barco-p50-gpio.o diff --git a/drivers/platform/x86/portwell-ec.c b/drivers/platform/x86/portwell-ec.c new file mode 100644 index 000000000000..e94377906745 --- /dev/null +++ b/drivers/platform/x86/portwell-ec.c @@ -0,0 +1,268 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * portwell-ec.c: Portwell embedded controller driver. + * + * Tested on: + * - Portwell NANO-6064 + * + * This driver provides support for GPIO and Watchdog Timer + * functionalities of the Portwell boards with ITE embedded controller (EC). + * The EC is accessed through I/O ports and provides: + * - 8 GPIO pins for control and monitoring + * - Hardware watchdog with 1-15300 second timeout range + * + * It integrates with the Linux GPIO and Watchdog subsystems, allowing + * userspace interaction with EC GPIO pins and watchdog control, + * ensuring system stability and configurability. + * + * (C) Copyright 2025 Portwell, Inc. + * Author: Yen-Chi Huang (jesse.huang@portwell.com.tw) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PORTWELL_EC_IOSPACE 0xe300 +#define PORTWELL_EC_IOSPACE_LEN 0x100 + +#define PORTWELL_GPIO_PINS 8 +#define PORTWELL_GPIO_DIR_REG 0x2b +#define PORTWELL_GPIO_VAL_REG 0x2c + +#define PORTWELL_WDT_EC_CONFIG_ADDR 0x06 +#define PORTWELL_WDT_CONFIG_ENABLE 0x1 +#define PORTWELL_WDT_CONFIG_DISABLE 0x0 +#define PORTWELL_WDT_EC_COUNT_MIN_ADDR 0x07 +#define PORTWELL_WDT_EC_COUNT_SEC_ADDR 0x08 +#define PORTWELL_WDT_EC_MAX_COUNT_SECOND 15300 //255*60secs + +#define PORTWELL_EC_FW_VENDOR_ADDRESS 0x4d +#define PORTWELL_EC_FW_VENDOR_LENGTH 3 +#define PORTWELL_EC_FW_VENDOR_NAME "PWG" + +static bool force; +module_param(force, bool, 0444); +MODULE_PARM_DESC(force, "Force loading ec driver without checking DMI boardname"); + +static const struct dmi_system_id pwec_dmi_table[] = { + { + .ident = "NANO-6064 series", + .matches = { + DMI_MATCH(DMI_BOARD_NAME, "NANO-6064"), + }, + }, + { } +}; +MODULE_DEVICE_TABLE(dmi, pwec_dmi_table); + +/* Functions for access EC via IOSPACE*/ + +static void pwec_write(u8 index, u8 data) +{ + outb(data, PORTWELL_EC_IOSPACE + index); +} + +static u8 pwec_read(u8 address) +{ + return inb(PORTWELL_EC_IOSPACE + address); +} + +/* GPIO functions*/ + +static int pwec_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + return (pwec_read(PORTWELL_GPIO_VAL_REG) & (1 << offset)) ? 1 : 0; +} + +static void pwec_gpio_set(struct gpio_chip *chip, unsigned int offset, int val) +{ + u8 tmp = pwec_read(PORTWELL_GPIO_VAL_REG); + + if (val) + tmp |= (1 << offset); + else + tmp &= ~(1 << offset); + pwec_write(PORTWELL_GPIO_VAL_REG, tmp); +} + +static int pwec_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + u8 direction = pwec_read(PORTWELL_GPIO_DIR_REG) & (1 << offset); + + if (direction) + return GPIO_LINE_DIRECTION_IN; + else + return GPIO_LINE_DIRECTION_OUT; +} + +/* + * Changing direction causes issues on some boards, + * so direction_input and direction_output are disabled for now. + */ + +static int pwec_gpio_direction_input(struct gpio_chip *gc, unsigned int offset) +{ + return -EOPNOTSUPP; +} + +static int pwec_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value) +{ + return -EOPNOTSUPP; +} + +static struct gpio_chip pwec_gpio_chip = { + .label = "portwell-ec-gpio", + .get_direction = pwec_gpio_get_direction, + .direction_input = pwec_gpio_direction_input, + .direction_output = pwec_gpio_direction_output, + .get = pwec_gpio_get, + .set = pwec_gpio_set, + .base = -1, + .ngpio = PORTWELL_GPIO_PINS, +}; + +/* Watchdog functions*/ + +static int pwec_wdt_trigger(struct watchdog_device *wdd) +{ + int retry = 10; + u8 min, sec; + unsigned int timeout; + + do { + pwec_write(PORTWELL_WDT_EC_COUNT_MIN_ADDR, wdd->timeout / 60); + pwec_write(PORTWELL_WDT_EC_COUNT_SEC_ADDR, wdd->timeout % 60); + pwec_write(PORTWELL_WDT_EC_CONFIG_ADDR, PORTWELL_WDT_CONFIG_ENABLE); + min = pwec_read(PORTWELL_WDT_EC_COUNT_MIN_ADDR); + sec = pwec_read(PORTWELL_WDT_EC_COUNT_SEC_ADDR); + timeout = min * 60 + sec; + retry--; + } while (timeout != wdd->timeout && retry >= 0); + if (retry < 0) { + pr_err("watchdog started failed\n"); + return -EIO; + } else + return 0; +} + +static int pwec_wdt_start(struct watchdog_device *wdd) +{ + return pwec_wdt_trigger(wdd); +} + +static int pwec_wdt_stop(struct watchdog_device *wdd) +{ + pwec_write(PORTWELL_WDT_EC_CONFIG_ADDR, PORTWELL_WDT_CONFIG_DISABLE); + return 0; +} + +static int pwec_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) +{ + if (timeout == 0 || timeout > PORTWELL_WDT_EC_MAX_COUNT_SECOND) + return -EINVAL; + wdd->timeout = timeout; + pwec_write(PORTWELL_WDT_EC_COUNT_MIN_ADDR, wdd->timeout / 60); + pwec_write(PORTWELL_WDT_EC_COUNT_SEC_ADDR, wdd->timeout % 60); + return 0; +} + +static unsigned int pwec_wdt_get_timeleft(struct watchdog_device *wdd) +{ + u8 min, sec; + + min = pwec_read(PORTWELL_WDT_EC_COUNT_MIN_ADDR); + sec = pwec_read(PORTWELL_WDT_EC_COUNT_SEC_ADDR); + return min * 60 + sec; +} + +static const struct watchdog_ops pwec_wdt_ops = { + .owner = THIS_MODULE, + .start = pwec_wdt_start, + .stop = pwec_wdt_stop, + .ping = pwec_wdt_trigger, + .set_timeout = pwec_wdt_set_timeout, + .get_timeleft = pwec_wdt_get_timeleft, +}; + +static struct watchdog_device ec_wdt_dev = { + .info = &(struct watchdog_info){ + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, + .identity = "Portwell EC Watchdog", + }, + .ops = &pwec_wdt_ops, + .timeout = 60, + .min_timeout = 1, + .max_timeout = PORTWELL_WDT_EC_MAX_COUNT_SECOND, +}; + +static int pwec_firmware_vendor_check(void) +{ + u8 buf[PORTWELL_EC_FW_VENDOR_LENGTH + 1]; + u8 i; + + for (i = 0; i < PORTWELL_EC_FW_VENDOR_LENGTH; i++) + buf[i] = pwec_read(PORTWELL_EC_FW_VENDOR_ADDRESS + i); + buf[PORTWELL_EC_FW_VENDOR_LENGTH] = '\0'; + + return (strcmp(PORTWELL_EC_FW_VENDOR_NAME, buf) == 0) ? 0 : -ENODEV; +} + +static int __init pwec_init(void) +{ + int result; + + if (!force) { + if (!dmi_check_system(pwec_dmi_table)) { + pr_info("unsupported platform\n"); + return -ENODEV; + } + } + + if (!request_region(PORTWELL_EC_IOSPACE, PORTWELL_EC_IOSPACE_LEN, "portwell-ec")) { + pr_err("I/O region 0xE300-0xE3FF busy\n"); + return -EBUSY; + } + + result = pwec_firmware_vendor_check(); + if (result < 0) + return result; + + result = gpiochip_add_data(&pwec_gpio_chip, NULL); + if (result < 0) { + pr_err("failed to register Portwell EC GPIO\n"); + return result; + } + + result = watchdog_register_device(&ec_wdt_dev); + if (result < 0) { + gpiochip_remove(&pwec_gpio_chip); + pr_err("failed to register Portwell EC Watchdog\n"); + return result; + } + + return 0; +} + +static void __exit pwec_exit(void) +{ + watchdog_unregister_device(&ec_wdt_dev); + gpiochip_remove(&pwec_gpio_chip); + release_region(PORTWELL_EC_IOSPACE, PORTWELL_EC_IOSPACE_LEN); +} + +module_init(pwec_init); +module_exit(pwec_exit); + +MODULE_AUTHOR("Yen-Chi Huang