From patchwork Wed Apr 14 11:48:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?546L5pOO?= X-Patchwork-Id: 12202445 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=ham 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 3551BC433ED for ; Wed, 14 Apr 2021 11:48:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0D49611B0 for ; Wed, 14 Apr 2021 11:48:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350607AbhDNLtS (ORCPT ); Wed, 14 Apr 2021 07:49:18 -0400 Received: from mail-m121145.qiye.163.com ([115.236.121.145]:19026 "EHLO mail-m121145.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350606AbhDNLtR (ORCPT ); Wed, 14 Apr 2021 07:49:17 -0400 Received: from vivo-HP-ProDesk-680-G4-PCI-MT.vivo.xyz (unknown [58.251.74.232]) by mail-m121145.qiye.163.com (Hmail) with ESMTPA id 04A988004B0; Wed, 14 Apr 2021 19:48:53 +0800 (CST) From: Wang Qing To: Wim Van Sebroeck , Guenter Roeck , Matthias Brugger , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Wang Qing Subject: [PATCH V3] watchdog: mtk: support pre-timeout when the bark irq is available Date: Wed, 14 Apr 2021 19:48:49 +0800 Message-Id: <1618400929-17013-1-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSE83V1ktWUFJV1kPCR oVCBIfWUFZGh9MSFZPHRkYQ0IYThhLSUxVEwETFhoSFyQUDg9ZV1kWGg8SFR0UWUFZT0tIVUpKS0 hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Mwg6PDo4Ez8XFhNPAksqPzNR M0IaCyFVSlVKTUpDT0tLQkhPTU5PVTMWGhIXVQwaFRwKEhUcOw0SDRRVGBQWRVlXWRILWUFZTkNV SU5KVUxPVUlISVlXWQgBWUFOSkNMNwY+ X-HM-Tid: 0a78d036799eb03akuuu04a988004b0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Use the bark interrupt as the pretimeout notifier if available. By default, the pretimeout notification shall occur one second earlier than the timeout. V2: - panic() by default if WATCHDOG_PRETIMEOUT_GOV is not enabled. V3: - Modify the pretimeout behavior, manually reset after the pretimeout - is processed and wait until timeout. Signed-off-by: Wang Qing --- drivers/watchdog/mtk_wdt.c | 62 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 57 insertions(+), 5 deletions(-) diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 97ca993..7bef1e3 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -25,6 +25,7 @@ #include #include #include +#include #define WDT_MAX_TIMEOUT 31 #define WDT_MIN_TIMEOUT 1 @@ -234,18 +235,46 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev) void __iomem *wdt_base = mtk_wdt->wdt_base; int ret; - ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout); + ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout - wdt_dev->pretimeout); if (ret < 0) return ret; reg = ioread32(wdt_base + WDT_MODE); - reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); + reg &= ~WDT_MODE_IRQ_EN; + if (wdt_dev->pretimeout) + reg |= WDT_MODE_IRQ_EN; + else + reg &= ~WDT_MODE_IRQ_EN; reg |= (WDT_MODE_EN | WDT_MODE_KEY); iowrite32(reg, wdt_base + WDT_MODE); return 0; } +static int mtk_wdt_set_pretimeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + wdd->pretimeout = timeout; + return mtk_wdt_start(wdd); +} + +static irqreturn_t mtk_wdt_isr(int irq, void *arg) +{ + struct watchdog_device *wdd = arg; + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdd); + void __iomem *wdt_base = mtk_wdt->wdt_base; + + watchdog_notify_pretimeout(wdd); + /* + * Guaranteed to be reset when the timeout + * expires under any situations + */ + mdelay(1000*wdd->pretimeout); + writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST); + + return IRQ_HANDLED; +} + static const struct watchdog_info mtk_wdt_info = { .identity = DRV_NAME, .options = WDIOF_SETTIMEOUT | @@ -253,12 +282,21 @@ static const struct watchdog_info mtk_wdt_info = { WDIOF_MAGICCLOSE, }; +static const struct watchdog_info mtk_wdt_pt_info = { + .identity = DRV_NAME, + .options = WDIOF_SETTIMEOUT | + WDIOF_PRETIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, +}; + static const struct watchdog_ops mtk_wdt_ops = { .owner = THIS_MODULE, .start = mtk_wdt_start, .stop = mtk_wdt_stop, .ping = mtk_wdt_ping, .set_timeout = mtk_wdt_set_timeout, + .set_pretimeout = mtk_wdt_set_pretimeout, .restart = mtk_wdt_restart, }; @@ -267,7 +305,7 @@ static int mtk_wdt_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct mtk_wdt_dev *mtk_wdt; const struct mtk_wdt_data *wdt_data; - int err; + int err, irq; mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL); if (!mtk_wdt) @@ -279,7 +317,22 @@ static int mtk_wdt_probe(struct platform_device *pdev) if (IS_ERR(mtk_wdt->wdt_base)) return PTR_ERR(mtk_wdt->wdt_base); - mtk_wdt->wdt_dev.info = &mtk_wdt_info; + irq = platform_get_irq(pdev, 0); + if (irq > 0) { + err = devm_request_irq(&pdev->dev, irq, mtk_wdt_isr, 0, "wdt_bark", + &mtk_wdt->wdt_dev); + if (err) + return err; + + mtk_wdt->wdt_dev.info = &mtk_wdt_pt_info; + mtk_wdt->wdt_dev.pretimeout = 1; + } else { + if (irq == -EPROBE_DEFER) + return -EPROBE_DEFER; + + mtk_wdt->wdt_dev.info = &mtk_wdt_info; + } + mtk_wdt->wdt_dev.ops = &mtk_wdt_ops; mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT; mtk_wdt->wdt_dev.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT * 1000; @@ -360,7 +413,6 @@ static struct platform_driver mtk_wdt_driver = { }; module_platform_driver(mtk_wdt_driver); - module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");