From patchwork Tue Jul 11 09:17:13 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: 13308309 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 53313EB64DD for ; Tue, 11 Jul 2023 09:24:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231714AbjGKJYO (ORCPT ); Tue, 11 Jul 2023 05:24:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232800AbjGKJXo (ORCPT ); Tue, 11 Jul 2023 05:23:44 -0400 X-Greylist: delayed 88 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Tue, 11 Jul 2023 02:19:22 PDT 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 286C646A1 for ; Tue, 11 Jul 2023 02:19:22 -0700 (PDT) Received: by mta-64-225.siemens.flowmailer.net with ESMTPSA id 20230711091750bca5fc6664ee3254cd for ; Tue, 11 Jul 2023 11:17:50 +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=cNKNC6oIcXI+MaGN9+y8x9Kvw+smz8uL9Y684QAwSc8=; b=V8ml7pwKF0A7d+MuOgmVtfrIc1O0Y+20hKNN4rl4H8w/aO8hILniyh75PI4TpKr1Tgevss ZYEKlBY4Dx3WMnyPnjIOzxhYT1EHxSUvYFV5BZ4s6BkuyXopa1z/BlfLsai6xRkCHvvDSL3G uUWrc/96uefC2BvXuX5NrAqX+GYEs=; 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 v2 3/3] watchdog:rit_wdt: Add support for WDIOF_CARDRESET Date: Tue, 11 Jul 2023 17:17:13 +0800 Message-Id: <20230711091713.1113010-4-huaqian.li@siemens.com> In-Reply-To: <20230711091713.1113010-1-huaqian.li@siemens.com> References: <20230711091713.1113010-1-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 --- 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..77fd6b54137c 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -18,6 +18,7 @@ #include #include #include +#include #define DEFAULT_HEARTBEAT 60 @@ -52,6 +53,11 @@ #define DWDST BIT(1) +#define PON_REASON_SOF_NUM 0xBBBBCCCC +#define PON_REASON_MAGIC_NUM 0xDDDDDDDD +#define PON_REASON_EOF_NUM 0xCCCCBBBB +#define PON_REASON_ITEM_BITS 0xFFFFFFFF + static int heartbeat = DEFAULT_HEARTBEAT; /* @@ -198,6 +204,11 @@ static int rti_wdt_probe(struct platform_device *pdev) struct rti_wdt_device *wdt; struct clk *clk; u32 last_ping = 0; + u32 reserved_mem_size; + unsigned long *vaddr; + unsigned long paddr; + u32 data[3]; + u32 reg[8]; wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) @@ -284,6 +295,43 @@ static int rti_wdt_probe(struct platform_device *pdev) } } + ret = of_property_read_variable_u32_array(pdev->dev.of_node, "reg", reg, + 0, ARRAY_SIZE(reg)); + if (ret < 0) { + dev_err(dev, "cannot read the reg info.\n"); + goto err_iomap; + } + + /* + * If reserved memory is defined for watchdog reset cause. + * Readout the Power-on(PON) reason and pass to bootstatus. + */ + if (ret == 8) { + paddr = reg[5]; + reserved_mem_size = reg[7]; + vaddr = memremap(paddr, reserved_mem_size, MEMREMAP_WB); + if (vaddr == NULL) { + dev_err(dev, "Failed to map memory-region.\n"); + goto err_iomap; + } + + data[0] = *vaddr & PON_REASON_ITEM_BITS; + data[1] = *(vaddr + 1) & PON_REASON_ITEM_BITS; + data[2] = *(vaddr + 2) & PON_REASON_ITEM_BITS; + + dev_dbg(dev, "Watchdog: sof = %lX, data = %lX, eof = %lX\n", + data[0], data[1], data[2]); + + if ((data[0] == PON_REASON_SOF_NUM) + && (data[1] == PON_REASON_MAGIC_NUM) + && (data[1] == PON_REASON_MAGIC_NUM)) { + dev_info(dev, "Watchdog reset cause detected.\n"); + wdd->bootstatus |= WDIOF_CARDRESET; + } + memset(vaddr, 0, reserved_mem_size); + memunmap(vaddr); + } + watchdog_init_timeout(wdd, heartbeat, dev); ret = watchdog_register_device(wdd);