From patchwork Tue Mar 2 16:33:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Henning Schild X-Patchwork-Id: 12112989 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B29E3C433E0 for ; Wed, 3 Mar 2021 06:59:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E45364EE3 for ; Wed, 3 Mar 2021 06:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236656AbhCCGu6 (ORCPT ); Wed, 3 Mar 2021 01:50:58 -0500 Received: from gecko.sbs.de ([194.138.37.40]:55490 "EHLO gecko.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1384786AbhCBQqx (ORCPT ); Tue, 2 Mar 2021 11:46:53 -0500 Received: from mail1.sbs.de (mail1.sbs.de [192.129.41.35]) by gecko.sbs.de (8.15.2/8.15.2) with ESMTPS id 122GhEw0015430 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Mar 2021 17:43:14 +0100 Received: from md1za8fc.ad001.siemens.net ([167.87.44.113]) by mail1.sbs.de (8.15.2/8.15.2) with ESMTP id 122GXBHQ025192; Tue, 2 Mar 2021 17:33:13 +0100 From: Henning Schild To: linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-watchdog@vger.kernel.org Cc: Srikanth Krishnakar , Jan Kiszka , Henning Schild , Gerd Haeussler , Guenter Roeck , Wim Van Sebroeck , Mark Gross , Hans de Goede , Pavel Machek Subject: [PATCH 3/4] watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs Date: Tue, 2 Mar 2021 17:33:08 +0100 Message-Id: <20210302163309.25528-4-henning.schild@siemens.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210302163309.25528-1-henning.schild@siemens.com> References: <20210302163309.25528-1-henning.schild@siemens.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Henning Schild This driver adds initial support for several devices from Siemens. It is based on a platform driver introduced in an earlier commit. Signed-off-by: Gerd Haeussler Signed-off-by: Henning Schild --- drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/simatic-ipc-wdt.c | 305 +++++++++++++++++++++++++++++ 3 files changed, 317 insertions(+) create mode 100644 drivers/watchdog/simatic-ipc-wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1fe0042a48d2..948497eb4bef 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1575,6 +1575,17 @@ config NIC7018_WDT To compile this driver as a module, choose M here: the module will be called nic7018_wdt. +config SIEMENS_SIMATIC_IPC_WDT + tristate "Siemens Simatic IPC Watchdog" + depends on SIEMENS_SIMATIC_IPC + select WATCHDOG_CORE + help + This driver adds support for several watchdogs found in Industrial + PCs from Siemens. + + To compile this driver as a module, choose M here: the module will be + called simatic-ipc-wdt. + # M68K Architecture config M54xx_WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index f3a6540e725e..7f5c73ec058c 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -142,6 +142,7 @@ obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o obj-$(CONFIG_MLX_WDT) += mlx_wdt.o obj-$(CONFIG_KEEMBAY_WATCHDOG) += keembay_wdt.o +obj-$(CONFIG_SIEMENS_SIMATIC_IPC_WDT) += simatic-ipc-wdt.o # M68K Architecture obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o diff --git a/drivers/watchdog/simatic-ipc-wdt.c b/drivers/watchdog/simatic-ipc-wdt.c new file mode 100644 index 000000000000..b5c8b7ceb404 --- /dev/null +++ b/drivers/watchdog/simatic-ipc-wdt.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Siemens SIMATIC IPC driver for Watchdogs + * + * Copyright (c) Siemens AG, 2020-2021 + * + * Authors: + * Gerd Haeussler + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define WD_ENABLE_IOADR 0x62 +#define WD_TRIGGER_IOADR 0x66 +#define GPIO_COMMUNITY0_PORT_ID 0xaf +#define PAD_CFG_DW0_GPP_A_23 0x4b8 +#define SAFE_EN_N_427E 0x01 +#define SAFE_EN_N_227E 0x04 +#define WD_ENABLED 0x01 + +#define TIMEOUT_MIN 2 +#define TIMEOUT_DEF 64 +#define TIMEOUT_MAX 64 + +#define GP_STATUS_REG_227E 0x404D /* IO PORT for SAFE_EN_N on 227E */ + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0000); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static DEFINE_SPINLOCK(io_lock); /* the lock for io operations */ +static struct watchdog_device wdd; + +static struct resource gp_status_reg_227e_res = + DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME); + +static struct resource io_resource = + DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1, + KBUILD_MODNAME " WD_ENABLE_IOADR"); + +/* the actual start will be discovered with pci, 0 is a placeholder */ +static struct resource mem_resource = + DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR"); + +static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 }; +static void __iomem *wd_reset_base_addr; + +static int get_timeout_idx(u32 timeout) +{ + int i; + + i = ARRAY_SIZE(wd_timeout_table) - 1; + for (; i >= 0; i--) { + if (timeout >= wd_timeout_table[i]) + break; + } + + return i; +} + +static int wd_start(struct watchdog_device *wdd) +{ + u8 regval; + + spin_lock(&io_lock); + + regval = inb(WD_ENABLE_IOADR); + regval |= WD_ENABLED; + outb(regval, WD_ENABLE_IOADR); + + spin_unlock(&io_lock); + + return 0; +} + +static int wd_stop(struct watchdog_device *wdd) +{ + u8 regval; + + spin_lock(&io_lock); + + regval = inb(WD_ENABLE_IOADR); + regval &= ~WD_ENABLED; + outb(regval, WD_ENABLE_IOADR); + + spin_unlock(&io_lock); + + return 0; +} + +static int wd_ping(struct watchdog_device *wdd) +{ + inb(WD_TRIGGER_IOADR); + return 0; +} + +static int wd_set_timeout(struct watchdog_device *wdd, unsigned int t) +{ + u8 regval; + int timeout_idx = get_timeout_idx(t); + + spin_lock(&io_lock); + + regval = inb(WD_ENABLE_IOADR) & 0xc7; + regval |= timeout_idx << 3; + outb(regval, WD_ENABLE_IOADR); + + spin_unlock(&io_lock); + wdd->timeout = wd_timeout_table[timeout_idx]; + + return 0; +} + +static const struct watchdog_info wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | + WDIOF_SETTIMEOUT, + .identity = KBUILD_MODNAME, +}; + +static const struct watchdog_ops wdt_ops = { + .owner = THIS_MODULE, + .start = wd_start, + .stop = wd_stop, + .ping = wd_ping, + .set_timeout = wd_set_timeout, +}; + +static void wd_set_safe_en_n(u32 wdtmode, bool safe_en_n) +{ + u16 resetbit; + + if (wdtmode == SIMATIC_IPC_DEVICE_227E) { + /* enable SAFE_EN_N on GP_STATUS_REG_227E */ + resetbit = inw(GP_STATUS_REG_227E); + if (safe_en_n) + resetbit &= ~SAFE_EN_N_227E; + else + resetbit |= SAFE_EN_N_227E; + + outw(resetbit, GP_STATUS_REG_227E); + } else { + /* enable SAFE_EN_N on PCH D1600 */ + resetbit = ioread16(wd_reset_base_addr); + + if (safe_en_n) + resetbit &= ~SAFE_EN_N_427E; + else + resetbit |= SAFE_EN_N_427E; + + iowrite16(resetbit, wd_reset_base_addr); + } +} + +static int wd_setup(u32 wdtmode, bool safe_en_n) +{ + u8 regval; + int timeout_idx = 0; + bool alarm_active; + + timeout_idx = get_timeout_idx(TIMEOUT_DEF); + + wd_set_safe_en_n(wdtmode, safe_en_n); + + /* read wd register to determine alarm state */ + regval = inb(WD_ENABLE_IOADR); + if (regval & 0x80) { + pr_warn("Watchdog alarm active.\n"); + regval = 0x82; /* use only macro mode, reset alarm bit */ + alarm_active = true; + } else { + regval = 0x02; /* use only macro mode */ + alarm_active = false; + } + + regval |= timeout_idx << 3; + if (nowayout) + regval |= WD_ENABLED; + + outb(regval, WD_ENABLE_IOADR); + + return alarm_active; +} + +static int simatic_ipc_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int rc = 0; + struct simatic_ipc_platform *plat = pdev->dev.platform_data; + struct resource *res; + + pr_debug(KBUILD_MODNAME ":%s(#%d) WDT mode: %d\n", + __func__, __LINE__, plat->devmode); + + switch (plat->devmode) { + case SIMATIC_IPC_DEVICE_227E: + if (!devm_request_region(dev, gp_status_reg_227e_res.start, + resource_size(&gp_status_reg_227e_res), + KBUILD_MODNAME)) { + dev_err(dev, + "Unable to register IO resource at %pR\n", + &gp_status_reg_227e_res); + return -EBUSY; + } + fallthrough; + case SIMATIC_IPC_DEVICE_427E: + wdd.info = &wdt_ident; + wdd.ops = &wdt_ops; + wdd.min_timeout = TIMEOUT_MIN; + wdd.max_timeout = TIMEOUT_MAX; + wdd.parent = NULL; + break; + default: + return -EINVAL; + } + + if (!devm_request_region(dev, io_resource.start, + resource_size(&io_resource), + io_resource.name)) { + dev_err(dev, + "Unable to register IO resource at %#x\n", + WD_ENABLE_IOADR); + return -EBUSY; + } + + if (plat->devmode == SIMATIC_IPC_DEVICE_427E) { + res = &mem_resource; + + /* get GPIO base from PCI */ + res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1)); + if (res->start == 0) + return -ENODEV; + + /* do the final address calculation */ + res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) + + PAD_CFG_DW0_GPP_A_23; + res->end += res->start; + + wd_reset_base_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(wd_reset_base_addr)) + return -ENOMEM; + } + + wdd.bootstatus = wd_setup(plat->devmode, true); + if (wdd.bootstatus) + pr_warn(KBUILD_MODNAME ": last reboot caused by watchdog reset\n"); + + watchdog_set_nowayout(&wdd, nowayout); + watchdog_stop_on_reboot(&wdd); + + rc = devm_watchdog_register_device(dev, &wdd); + + if (rc == 0) + pr_debug("initialized. nowayout=%d\n", + nowayout); + + return rc; +} + +static int simatic_ipc_wdt_remove(struct platform_device *pdev) +{ + struct simatic_ipc_platform *plat = pdev->dev.platform_data; + + wd_setup(plat->devmode, false); + return 0; +} + +static struct platform_driver wdt_driver = { + .probe = simatic_ipc_wdt_probe, + .remove = simatic_ipc_wdt_remove, + .driver = { + .name = KBUILD_MODNAME, + }, +}; + +static int __init simatic_ipc_wdt_init(void) +{ + return platform_driver_register(&wdt_driver); +} + +static void __exit simatic_ipc_wdt_exit(void) +{ + platform_driver_unregister(&wdt_driver); +} + +module_init(simatic_ipc_wdt_init); +module_exit(simatic_ipc_wdt_exit); + +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" KBUILD_MODNAME); +MODULE_AUTHOR("Gerd Haeussler ");