From patchwork Fri Jan 13 06:23:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 642783 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 9B08DC54EBD for ; Fri, 13 Jan 2023 06:27:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240873AbjAMG1T (ORCPT ); Fri, 13 Jan 2023 01:27:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236952AbjAMGYr (ORCPT ); Fri, 13 Jan 2023 01:24:47 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05B766A0F5; Thu, 12 Jan 2023 22:24:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=mxBIoTcWoM961bskFu4vgLYA4iK6lfkfHo46ovOHhdY=; b=epactF3LWIS1c8xybu121AnX4l mxQDeqmEC9J8cgMc2SIYAO9NzF3h0YlU8xbCTYRLLK24zqc8kEMH0PpbDIl1CALQ06M6j2t+DvW/2 52IjFzvuXiBDn229AAQmQ76IVBLDEALsaXsG/rhqbYhzaI4Hb2k5FYwBW/QtpL+GpgBj1CYNBCjoU Wow0ecEypZirO8g6qBKEcpON8H7jgnTwizxUEhR74JGhqggyXfr0uC5oDRw7YO7Ldj7yKS+YzcUmZ aD+BC5AU+OusXU3+GAHmRsZapXMUIGr4gkeRILIjbZ4eJzhz4I3ZIHuh91N7YMYtmI2wXUBJeRcBz reMo6ZfA==; Received: from [2001:4bb8:181:656b:9509:7d20:8d39:f895] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGDTy-000lWK-J8; Fri, 13 Jan 2023 06:24:07 +0000 From: Christoph Hellwig To: Yoshinori Sato , Rich Felker , Arnd Bergmann , Greg Kroah-Hartman Cc: Laurent Pinchart , Kieran Bingham , Geert Uytterhoeven , linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, dmaengine@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, netdev@vger.kernel.org, linux-gpio@vger.kernel.org, linux-rtc@vger.kernel.org, linux-spi@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org, alsa-devel@alsa-project.org, linux-sh@vger.kernel.org Subject: [PATCH 06/22] watchdog: remove the shwdt driver Date: Fri, 13 Jan 2023 07:23:23 +0100 Message-Id: <20230113062339.1909087-7-hch@lst.de> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230113062339.1909087-1-hch@lst.de> References: <20230113062339.1909087-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Now that arch/sh is removed this driver is dead code. Signed-off-by: Christoph Hellwig --- .../watchdog/watchdog-parameters.rst | 12 - drivers/watchdog/Kconfig | 20 - drivers/watchdog/Makefile | 3 - drivers/watchdog/shwdt.c | 344 ------------------ 4 files changed, 379 deletions(-) delete mode 100644 drivers/watchdog/shwdt.c diff --git a/Documentation/watchdog/watchdog-parameters.rst b/Documentation/watchdog/watchdog-parameters.rst index 29153eed668900..553ac2f8ae23f7 100644 --- a/Documentation/watchdog/watchdog-parameters.rst +++ b/Documentation/watchdog/watchdog-parameters.rst @@ -579,18 +579,6 @@ scx200_wdt: ------------------------------------------------- -shwdt: - clock_division_ratio: - Clock division ratio. Valid ranges are from 0x5 (1.31ms) - to 0x7 (5.25ms). (default=7) - heartbeat: - Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default=30 - nowayout: - Watchdog cannot be stopped once started - (default=kernel config parameter) - -------------------------------------------------- - smsc37b787_wdt: timeout: range is 1-255 units, default is 60 diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0bc40b763b0652..7db0a5e636cf65 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -2015,26 +2015,6 @@ config DIAG288_WATCHDOG To compile this driver as a module, choose M here. The module will be called diag288_wdt. -# SUPERH (sh + sh64) Architecture - -config SH_WDT - tristate "SuperH Watchdog" - depends on SUPERH && (CPU_SH3 || CPU_SH4 || COMPILE_TEST) - select WATCHDOG_CORE - help - This driver adds watchdog support for the integrated watchdog in the - SuperH processors. If you have one of these processors and wish - to have watchdog support enabled, say Y, otherwise say N. - - As a side note, saying Y here will automatically boost HZ to 1000 - so that the timer has a chance to clear the overflow counter. On - slower systems (such as the SH-2 and SH-3) this will likely yield - some performance issues. As such, the WDT should be avoided here - unless it is absolutely necessary. - - To compile this driver as a module, choose M here: the - module will be called shwdt. - # SPARC Architecture # SPARC64 Architecture diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 9cbf6580f16c9f..a852ab4d7176ac 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -195,9 +195,6 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o # S390 Architecture obj-$(CONFIG_DIAG288_WATCHDOG) += diag288_wdt.o -# SUPERH (sh + sh64) Architecture -obj-$(CONFIG_SH_WDT) += shwdt.o - # SPARC Architecture # SPARC64 Architecture diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c deleted file mode 100644 index f55533e0e0454e..00000000000000 --- a/drivers/watchdog/shwdt.c +++ /dev/null @@ -1,344 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * drivers/watchdog/shwdt.c - * - * Watchdog driver for integrated watchdog in the SuperH processors. - * - * Copyright (C) 2001 - 2012 Paul Mundt - * - * 14-Dec-2001 Matt Domsch - * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT - * - * 19-Apr-2002 Rob Radez - * Added expect close support, made emulated timeout runtime changeable - * general cleanups, add some ioctls - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define DRV_NAME "sh-wdt" - -/* - * Default clock division ratio is 5.25 msecs. For an additional table of - * values, consult the asm-sh/watchdog.h. Overload this at module load - * time. - * - * In order for this to work reliably we need to have HZ set to 1000 or - * something quite higher than 100 (or we need a proper high-res timer - * implementation that will deal with this properly), otherwise the 10ms - * resolution of a jiffy is enough to trigger the overflow. For things like - * the SH-4 and SH-5, this isn't necessarily that big of a problem, though - * for the SH-2 and SH-3, this isn't recommended unless the WDT is absolutely - * necssary. - * - * As a result of this timing problem, the only modes that are particularly - * feasible are the 4096 and the 2048 divisors, which yield 5.25 and 2.62ms - * overflow periods respectively. - * - * Also, since we can't really expect userspace to be responsive enough - * before the overflow happens, we maintain two separate timers .. One in - * the kernel for clearing out WOVF every 2ms or so (again, this depends on - * HZ == 1000), and another for monitoring userspace writes to the WDT device. - * - * As such, we currently use a configurable heartbeat interval which defaults - * to 30s. In this case, the userspace daemon is only responsible for periodic - * writes to the device before the next heartbeat is scheduled. If the daemon - * misses its deadline, the kernel timer will allow the WDT to overflow. - */ -static int clock_division_ratio = WTCSR_CKS_4096; -#define next_ping_period(cks) (jiffies + msecs_to_jiffies(cks - 4)) - -#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */ -static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */ -static bool nowayout = WATCHDOG_NOWAYOUT; -static unsigned long next_heartbeat; - -struct sh_wdt { - void __iomem *base; - struct device *dev; - struct clk *clk; - spinlock_t lock; - - struct timer_list timer; -}; - -static int sh_wdt_start(struct watchdog_device *wdt_dev) -{ - struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); - unsigned long flags; - u8 csr; - - pm_runtime_get_sync(wdt->dev); - clk_enable(wdt->clk); - - spin_lock_irqsave(&wdt->lock, flags); - - next_heartbeat = jiffies + (heartbeat * HZ); - mod_timer(&wdt->timer, next_ping_period(clock_division_ratio)); - - csr = sh_wdt_read_csr(); - csr |= WTCSR_WT | clock_division_ratio; - sh_wdt_write_csr(csr); - - sh_wdt_write_cnt(0); - - /* - * These processors have a bit of an inconsistent initialization - * process.. starting with SH-3, RSTS was moved to WTCSR, and the - * RSTCSR register was removed. - * - * On the SH-2 however, in addition with bits being in different - * locations, we must deal with RSTCSR outright.. - */ - csr = sh_wdt_read_csr(); - csr |= WTCSR_TME; - csr &= ~WTCSR_RSTS; - sh_wdt_write_csr(csr); - -#ifdef CONFIG_CPU_SH2 - csr = sh_wdt_read_rstcsr(); - csr &= ~RSTCSR_RSTS; - sh_wdt_write_rstcsr(csr); -#endif - spin_unlock_irqrestore(&wdt->lock, flags); - - return 0; -} - -static int sh_wdt_stop(struct watchdog_device *wdt_dev) -{ - struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); - unsigned long flags; - u8 csr; - - spin_lock_irqsave(&wdt->lock, flags); - - del_timer(&wdt->timer); - - csr = sh_wdt_read_csr(); - csr &= ~WTCSR_TME; - sh_wdt_write_csr(csr); - - spin_unlock_irqrestore(&wdt->lock, flags); - - clk_disable(wdt->clk); - pm_runtime_put_sync(wdt->dev); - - return 0; -} - -static int sh_wdt_keepalive(struct watchdog_device *wdt_dev) -{ - struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); - unsigned long flags; - - spin_lock_irqsave(&wdt->lock, flags); - next_heartbeat = jiffies + (heartbeat * HZ); - spin_unlock_irqrestore(&wdt->lock, flags); - - return 0; -} - -static int sh_wdt_set_heartbeat(struct watchdog_device *wdt_dev, unsigned t) -{ - struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); - unsigned long flags; - - if (unlikely(t < 1 || t > 3600)) /* arbitrary upper limit */ - return -EINVAL; - - spin_lock_irqsave(&wdt->lock, flags); - heartbeat = t; - wdt_dev->timeout = t; - spin_unlock_irqrestore(&wdt->lock, flags); - - return 0; -} - -static void sh_wdt_ping(struct timer_list *t) -{ - struct sh_wdt *wdt = from_timer(wdt, t, timer); - unsigned long flags; - - spin_lock_irqsave(&wdt->lock, flags); - if (time_before(jiffies, next_heartbeat)) { - u8 csr; - - csr = sh_wdt_read_csr(); - csr &= ~WTCSR_IOVF; - sh_wdt_write_csr(csr); - - sh_wdt_write_cnt(0); - - mod_timer(&wdt->timer, next_ping_period(clock_division_ratio)); - } else - dev_warn(wdt->dev, "Heartbeat lost! Will not ping " - "the watchdog\n"); - spin_unlock_irqrestore(&wdt->lock, flags); -} - -static const struct watchdog_info sh_wdt_info = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "SH WDT", -}; - -static const struct watchdog_ops sh_wdt_ops = { - .owner = THIS_MODULE, - .start = sh_wdt_start, - .stop = sh_wdt_stop, - .ping = sh_wdt_keepalive, - .set_timeout = sh_wdt_set_heartbeat, -}; - -static struct watchdog_device sh_wdt_dev = { - .info = &sh_wdt_info, - .ops = &sh_wdt_ops, -}; - -static int sh_wdt_probe(struct platform_device *pdev) -{ - struct sh_wdt *wdt; - int rc; - - /* - * As this driver only covers the global watchdog case, reject - * any attempts to register per-CPU watchdogs. - */ - if (pdev->id != -1) - return -EINVAL; - - wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL); - if (unlikely(!wdt)) - return -ENOMEM; - - wdt->dev = &pdev->dev; - - wdt->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(wdt->clk)) { - /* - * Clock framework support is optional, continue on - * anyways if we don't find a matching clock. - */ - wdt->clk = NULL; - } - - wdt->base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(wdt->base)) - return PTR_ERR(wdt->base); - - watchdog_set_nowayout(&sh_wdt_dev, nowayout); - watchdog_set_drvdata(&sh_wdt_dev, wdt); - sh_wdt_dev.parent = &pdev->dev; - - spin_lock_init(&wdt->lock); - - rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat); - if (unlikely(rc)) { - /* Default timeout if invalid */ - sh_wdt_set_heartbeat(&sh_wdt_dev, WATCHDOG_HEARTBEAT); - - dev_warn(&pdev->dev, - "heartbeat value must be 1<=x<=3600, using %d\n", - sh_wdt_dev.timeout); - } - - dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n", - sh_wdt_dev.timeout, nowayout); - - rc = watchdog_register_device(&sh_wdt_dev); - if (unlikely(rc)) { - dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc); - return rc; - } - - timer_setup(&wdt->timer, sh_wdt_ping, 0); - wdt->timer.expires = next_ping_period(clock_division_ratio); - - dev_info(&pdev->dev, "initialized.\n"); - - pm_runtime_enable(&pdev->dev); - - return 0; -} - -static int sh_wdt_remove(struct platform_device *pdev) -{ - watchdog_unregister_device(&sh_wdt_dev); - - pm_runtime_disable(&pdev->dev); - - return 0; -} - -static void sh_wdt_shutdown(struct platform_device *pdev) -{ - sh_wdt_stop(&sh_wdt_dev); -} - -static struct platform_driver sh_wdt_driver = { - .driver = { - .name = DRV_NAME, - }, - - .probe = sh_wdt_probe, - .remove = sh_wdt_remove, - .shutdown = sh_wdt_shutdown, -}; - -static int __init sh_wdt_init(void) -{ - if (unlikely(clock_division_ratio < 0x5 || - clock_division_ratio > 0x7)) { - clock_division_ratio = WTCSR_CKS_4096; - - pr_info("divisor must be 0x5<=x<=0x7, using %d\n", - clock_division_ratio); - } - - return platform_driver_register(&sh_wdt_driver); -} - -static void __exit sh_wdt_exit(void) -{ - platform_driver_unregister(&sh_wdt_driver); -} -module_init(sh_wdt_init); -module_exit(sh_wdt_exit); - -MODULE_AUTHOR("Paul Mundt "); -MODULE_DESCRIPTION("SuperH watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:" DRV_NAME); - -module_param(clock_division_ratio, int, 0); -MODULE_PARM_DESC(clock_division_ratio, - "Clock division ratio. Valid ranges are from 0x5 (1.31ms) " - "to 0x7 (5.25ms). (default=" __MODULE_STRING(WTCSR_CKS_4096) ")"); - -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, - "Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default=" - __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); - -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");