From patchwork Fri Nov 26 14:10:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Henning Schild X-Patchwork-Id: 519619 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1A12C433F5 for ; Fri, 26 Nov 2021 14:13:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377730AbhKZOQN (ORCPT ); Fri, 26 Nov 2021 09:16:13 -0500 Received: from thoth.sbs.de ([192.35.17.2]:47655 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349477AbhKZOOL (ORCPT ); Fri, 26 Nov 2021 09:14:11 -0500 Received: from mail2.sbs.de (mail2.sbs.de [192.129.41.66]) by thoth.sbs.de (8.15.2/8.15.2) with ESMTPS id 1AQEAXE0018604 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 26 Nov 2021 15:10:33 +0100 Received: from localhost.localdomain ([139.22.47.90]) by mail2.sbs.de (8.15.2/8.15.2) with ESMTP id 1AQEAUXI030519; Fri, 26 Nov 2021 15:10:32 +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 , Andy Shevchenko , Enrico Weigelt Subject: [PATCH v4 3/4] watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs Date: Fri, 26 Nov 2021 15:10:26 +0100 Message-Id: <20211126141027.16161-4-henning.schild@siemens.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211126141027.16161-1-henning.schild@siemens.com> References: <20211126141027.16161-1-henning.schild@siemens.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org 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: Henning Schild Reviewed-by: Guenter Roeck --- drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/simatic-ipc-wdt.c | 228 +++++++++++++++++++++++++++++ 3 files changed, 240 insertions(+) create mode 100644 drivers/watchdog/simatic-ipc-wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 9d222ba17ec6..1dc86eb1361a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1589,6 +1589,17 @@ 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 2ee97064145b..31b931846e32 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -143,6 +143,7 @@ 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..8bac793c63fb --- /dev/null +++ b/drivers/watchdog/simatic-ipc-wdt.c @@ -0,0 +1,228 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Siemens SIMATIC IPC driver for Watchdogs + * + * Copyright (c) Siemens AG, 2020-2021 + * + * Authors: + * Gerd Haeussler + */ + +#include +#include +#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 WD_TRIGGERED 0x80 +#define WD_MACROMODE 0x02 + +#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 struct resource gp_status_reg_227e_res = + DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME); + +static struct resource io_resource_enable = + DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1, + KBUILD_MODNAME " WD_ENABLE_IOADR"); + +static struct resource io_resource_trigger = + DEFINE_RES_IO_NAMED(WD_TRIGGER_IOADR, SZ_1, + KBUILD_MODNAME " WD_TRIGGER_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 wd_start(struct watchdog_device *wdd) +{ + outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR); + return 0; +} + +static int wd_stop(struct watchdog_device *wdd) +{ + outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR); + 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) +{ + int timeout_idx = find_closest(t, wd_timeout_table, + ARRAY_SIZE(wd_timeout_table)); + + outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, WD_ENABLE_IOADR); + 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_secondary_enable(u32 wdtmode) +{ + u16 resetbit; + + /* set safe_en_n so we are not just WDIOF_ALARMONLY */ + if (wdtmode == SIMATIC_IPC_DEVICE_227E) { + /* enable SAFE_EN_N on GP_STATUS_REG_227E */ + resetbit = inb(GP_STATUS_REG_227E); + outb(resetbit & ~SAFE_EN_N_227E, GP_STATUS_REG_227E); + } else { + /* enable SAFE_EN_N on PCH D1600 */ + resetbit = ioread16(wd_reset_base_addr); + iowrite16(resetbit & ~SAFE_EN_N_427E, wd_reset_base_addr); + } +} + +static int wd_setup(u32 wdtmode) +{ + unsigned int bootstatus = 0; + int timeout_idx; + + timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table, + ARRAY_SIZE(wd_timeout_table)); + + if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED) + bootstatus |= WDIOF_CARDRESET; + + /* reset alarm bit, set macro mode, and set timeout */ + outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, WD_ENABLE_IOADR); + + wd_secondary_enable(wdtmode); + + return bootstatus; +} + +static struct watchdog_device wdd_data = { + .info = &wdt_ident, + .ops = &wdt_ops, + .min_timeout = TIMEOUT_MIN, + .max_timeout = TIMEOUT_MAX +}; + +static int simatic_ipc_wdt_probe(struct platform_device *pdev) +{ + struct simatic_ipc_platform *plat = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + struct resource *res; + + 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_data.parent = dev; + break; + default: + return -EINVAL; + } + + if (!devm_request_region(dev, io_resource_enable.start, + resource_size(&io_resource_enable), + io_resource_enable.name)) { + dev_err(dev, + "Unable to register IO resource at %#x\n", + WD_ENABLE_IOADR); + return -EBUSY; + } + + if (!devm_request_region(dev, io_resource_trigger.start, + resource_size(&io_resource_trigger), + io_resource_trigger.name)) { + dev_err(dev, + "Unable to register IO resource at %#x\n", + WD_TRIGGER_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 PTR_ERR(wd_reset_base_addr); + } + + wdd_data.bootstatus = wd_setup(plat->devmode); + if (wdd_data.bootstatus) + dev_warn(dev, "last reboot caused by watchdog reset\n"); + + watchdog_set_nowayout(&wdd_data, nowayout); + watchdog_stop_on_reboot(&wdd_data); + return devm_watchdog_register_device(dev, &wdd_data); +} + +static struct platform_driver simatic_ipc_wdt_driver = { + .probe = simatic_ipc_wdt_probe, + .driver = { + .name = KBUILD_MODNAME, + }, +}; + +module_platform_driver(simatic_ipc_wdt_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" KBUILD_MODNAME); +MODULE_AUTHOR("Gerd Haeussler ");