From patchwork Tue Jul 18 02:10:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Hua Qian" X-Patchwork-Id: 704310 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 7F78DEB64DC for ; Tue, 18 Jul 2023 02:12:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230041AbjGRCMY (ORCPT ); Mon, 17 Jul 2023 22:12:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230266AbjGRCMW (ORCPT ); Mon, 17 Jul 2023 22:12:22 -0400 Received: from mta-64-225.siemens.flowmailer.net (mta-64-225.siemens.flowmailer.net [185.136.64.225]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7993210F0 for ; Mon, 17 Jul 2023 19:12:19 -0700 (PDT) Received: by mta-64-225.siemens.flowmailer.net with ESMTPSA id 202307180212196ffdfef2bd7415ee35 for ; Tue, 18 Jul 2023 04:12:19 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=huaqian.li@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=P+e4mgQf7YcgATPvUbBvEm5Pd72/FjOAYEsp6bDRqIE=; b=nm92q4mscd4W1AyCnXiVJxwBNnOnefvJdnm4dUNuN6aE2WOJfFs/Q1YaFxQi1LYNe+Pehe C5p3DPvwNrd++0fn0+jdZj7EktIhuvqG5GIPmS+XCfJ/o5ebvrMYqzvTeJwDMUVQuFIc6H26 kD6vPVYTfqeJ6Orkj4A+8yHBeMX4Y=; From: huaqian.li@siemens.com To: wim@linux-watchdog.org, linux@roeck-us.net, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org Cc: huaqianlee@gmail.com, nm@ti.com, vigneshr@ti.com, kristo@kernel.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jan.kiszka@siemens.com, baocheng.su@siemens.com, Li Hua Qian Subject: [PATCH v6 3/3] watchdog:rit_wdt: Add support for WDIOF_CARDRESET Date: Tue, 18 Jul 2023 10:10:07 +0800 Message-Id: <20230718021007.1338761-4-huaqian.li@siemens.com> In-Reply-To: <20230718021007.1338761-1-huaqian.li@siemens.com> References: <20230718021007.1338761-1-huaqian.li@siemens.com> MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-959203:519-21489:flowmailer Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Li Hua Qian This patch adds the WDIOF_CARDRESET support for the platform watchdog whose hardware does not support this feature, to know if the board reboot is due to a watchdog reset. This is done via reserved memory(RAM), which indicates if specific info saved, triggering the watchdog reset in last boot. Signed-off-by: Li Hua Qian Reviewed-by: Guenter Roeck --- drivers/watchdog/rti_wdt.c | 48 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c index ce8f18e93aa9..901109d979f0 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -14,6 +14,8 @@ #include #include #include +#include +#include #include #include #include @@ -52,6 +54,11 @@ #define DWDST BIT(1) +#define PON_REASON_SOF_NUM 0xBBBBCCCC +#define PON_REASON_MAGIC_NUM 0xDDDDDDDD +#define PON_REASON_EOF_NUM 0xCCCCBBBB +#define RESERVED_MEM_MIN_SIZE 12 + static int heartbeat = DEFAULT_HEARTBEAT; /* @@ -198,6 +205,11 @@ static int rti_wdt_probe(struct platform_device *pdev) struct rti_wdt_device *wdt; struct clk *clk; u32 last_ping = 0; + struct device_node *node; + u32 reserved_mem_size; + struct resource res; + u32 *vaddr; + u64 paddr; wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) @@ -284,6 +296,42 @@ static int rti_wdt_probe(struct platform_device *pdev) } } + node = of_parse_phandle(pdev->dev.of_node, "memory-region", 0); + if (node) { + ret = of_address_to_resource(node, 0, &res); + if (ret) { + dev_err(dev, "No memory address assigned to the region.\n"); + goto err_iomap; + } + + /* + * If reserved memory is defined for watchdog reset cause. + * Readout the Power-on(PON) reason and pass to bootstatus. + */ + paddr = res.start; + reserved_mem_size = resource_size(&res); + if (reserved_mem_size < RESERVED_MEM_MIN_SIZE) { + dev_err(dev, "The size of reserved memory is too small.\n"); + ret = -EINVAL; + goto err_iomap; + } + + vaddr = memremap(paddr, reserved_mem_size, MEMREMAP_WB); + if (vaddr == NULL) { + dev_err(dev, "Failed to map memory-region.\n"); + ret = -ENOMEM; + goto err_iomap; + } + + if (vaddr[0] == PON_REASON_SOF_NUM && + vaddr[1] == PON_REASON_MAGIC_NUM && + vaddr[2] == PON_REASON_EOF_NUM) { + wdd->bootstatus |= WDIOF_CARDRESET; + } + memset(vaddr, 0, reserved_mem_size); + memunmap(vaddr); + } + watchdog_init_timeout(wdd, heartbeat, dev); ret = watchdog_register_device(wdd);