From patchwork Mon Jul 17 06:41:22 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: 13315245 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 C6955C001E0 for ; Mon, 17 Jul 2023 06:42:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229811AbjGQGmb (ORCPT ); Mon, 17 Jul 2023 02:42:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229765AbjGQGma (ORCPT ); Mon, 17 Jul 2023 02:42:30 -0400 Received: from mta-65-225.siemens.flowmailer.net (mta-65-225.siemens.flowmailer.net [185.136.65.225]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 479A6E79 for ; Sun, 16 Jul 2023 23:42:29 -0700 (PDT) Received: by mta-65-225.siemens.flowmailer.net with ESMTPSA id 20230717064228194a98e60b12c03f45 for ; Mon, 17 Jul 2023 08:42:29 +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=vpfuH8sO5ZXk6LmePDc8wki73sNjAE9XINk/NZwj+Mg=; b=LAgXbKXfDamncftkPbiFGAK48P4YUhH+QFoyihcqFqYTMdrxvBaNq4h0QNKgOaQ7qqiBa6 jCOHOy/p+KKWTRLJyalN/wcbfVXQV4SQy7MQlWmlr59mAmJMTgY5Vrdl7SdNccGnAUGMraiL KyuRqbf3pDC+FNxCfa4LicY77udb4=; 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 v5 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET Date: Mon, 17 Jul 2023 14:41:22 +0800 Message-Id: <20230717064124.1315746-2-huaqian.li@siemens.com> In-Reply-To: <20230717064124.1315746-1-huaqian.li@siemens.com> References: <20230717064124.1315746-1-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 TI RTI (Real Time Interrupt) Watchdog doesn't support to record the watchdog cause. Add a reserved memory to know the last reboot was caused by the watchdog card. In the reserved memory, some specific info will be saved to indicate whether the watchdog reset was triggered in last boot. Reviewed-by: Guenter Roeck Signed-off-by: Li Hua Qian --- .../bindings/watchdog/ti,rti-wdt.yaml | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml index fc553211e42d..4b66c4fcdf35 100644 --- a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml @@ -34,6 +34,20 @@ properties: power-domains: maxItems: 1 + memory-region: + maxItems: 1 + description: + Contains the watchdog reserved memory. It is optional. + In the reserved memory, the specified values, which are + PON_REASON_SOF_NUM(0xBBBBCCCC), PON_REASON_MAGIC_NUM(0xDDDDDDDD), + and PON_REASON_EOF_NUM(0xCCCCBBBB), are pre-stored at the first + 3 * 4 bytes to tell that last boot was caused by watchdog reset. + Once the PON reason is captured by driver(rti_wdt.c), the driver + is supposed to wipe the whole memory region. Surely, if this + property is set, at least 12 bytes reserved memory starting from + specific memory address(0xa220000) should be set. More please + refer to Example 2. + required: - compatible - reg @@ -59,3 +73,30 @@ examples: assigned-clocks = <&k3_clks 252 1>; assigned-clock-parents = <&k3_clks 252 5>; }; + + - | + // Example 2 (Add reserved memory for watchdog reset cause): + /* + * RTI WDT in main domain on J721e SoC. Assigned clocks are used to + * select the source clock for the watchdog, forcing it to tick with + * a 32kHz clock in this case. Add a reserved memory to keep the + * watchdog reset cause persistent, which was be written in 12 bytes + * starting from 0xa2200000 by RTI Watchdog Firmware. + * + * Reserved memory should be defined as follows: + * reserved-memory { + * wdt_reset_memory_region: wdt-memory@a2200000 { + * reg = <0x00 0xa2200000 0x00 0x1000>; + * no-map; + * }; + * } + */ + watchdog@40610000 { + compatible = "ti,j7-rti-wdt"; + reg = <0x40610000 0x100>; + clocks = <&k3_clks 135 1>; + power-domains = <&k3_pds 135 TI_SCI_PD_EXCLUSIVE>; + assigned-clocks = <&k3_clks 135 0>; + assigned-clock-parents = <&k3_clks 135 4>; + memory-region = <&wdt_reset_memory_region>; + }; From patchwork Mon Jul 17 06:41:23 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: 13315246 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 BC04BC001E0 for ; Mon, 17 Jul 2023 06:42:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229906AbjGQGmx (ORCPT ); Mon, 17 Jul 2023 02:42:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229835AbjGQGmq (ORCPT ); Mon, 17 Jul 2023 02:42:46 -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 2F23110F9 for ; Sun, 16 Jul 2023 23:42:36 -0700 (PDT) Received: by mta-64-225.siemens.flowmailer.net with ESMTPSA id 20230717064234f9122f3c81ae64602b for ; Mon, 17 Jul 2023 08:42:34 +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=jnvC6oqf7550vuX04Y+Pl19iCeyz3P0LnhYgz2I4V6w=; b=V4MDgfPufjIsk99rIuCKcySwCscCpLokAdMf9J/sCPVwjq5Yuz4n8qXXKz9UuyJGXuDpDl AzZaD9cXbWbvO5Wczwcp+pmpXMnogwsRl0nE2eFCpWepDro2gIyF+2ZKoCv2xz/83Z0Y0fmh rc+HRKSSp/PTxtMH4YP603pjX/xHI=; 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: [DONOTMERGE PATCH v5 2/3] arm64: dts: ti: Add reserved memory for watchdog Date: Mon, 17 Jul 2023 14:41:23 +0800 Message-Id: <20230717064124.1315746-3-huaqian.li@siemens.com> In-Reply-To: <20230717064124.1315746-1-huaqian.li@siemens.com> References: <20230717064124.1315746-1-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 a reserved memory for the TI AM65X platform watchdog to reserve the specific info, triggering the watchdog reset in last boot, to know if the board reboot is due to a watchdog reset. Signed-off-by: Li Hua Qian --- arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi index e26bd988e522..4bb20d493651 100644 --- a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi @@ -63,6 +63,12 @@ rtos_ipc_memory_region: ipc-memories@a2000000 { alignment = <0x1000>; no-map; }; + + /* To reserve the power-on(PON) reason for watchdog reset */ + wdt_reset_memory_region: wdt-memory@a2200000 { + reg = <0x00 0xa2200000 0x00 0x1000>; + no-map; + }; }; leds { @@ -718,3 +724,7 @@ &mcu_r5fss0_core1 { <&mcu_r5fss0_core1_memory_region>; mboxes = <&mailbox0_cluster1>, <&mbox_mcu_r5fss0_core1>; }; + +&mcu_rti1 { + memory-region = <&wdt_reset_memory_region>; +}; From patchwork Mon Jul 17 06:41:24 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: 13315247 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 58053EB64DC for ; Mon, 17 Jul 2023 06:43:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229588AbjGQGn5 (ORCPT ); Mon, 17 Jul 2023 02:43:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229912AbjGQGn4 (ORCPT ); Mon, 17 Jul 2023 02:43:56 -0400 X-Greylist: delayed 72 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sun, 16 Jul 2023 23:43:54 PDT Received: from mta-65-226.siemens.flowmailer.net (mta-65-226.siemens.flowmailer.net [185.136.65.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C03BE7A for ; Sun, 16 Jul 2023 23:43:54 -0700 (PDT) Received: by mta-65-226.siemens.flowmailer.net with ESMTPSA id 20230717064239f533b29fe06bac8a1a for ; Mon, 17 Jul 2023 08:42:40 +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=ht4HJ4tEZG0lOx1xwjmDOQf4LuC7z+nRLerQvpuCs8s0BNIkqtfrZUlSn5GlV4BefiRbBu 9ovphg+aNUpv2qjQmiQT/U3VLcrI1WgWzxEc/lZTFCeYe4VEjhiFfTYmoo5f+Yo4xw8KV/na 3mmJpQ+FHnJDbROEhMsZ4J9UfKlbQ=; 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 v5 3/3] watchdog:rit_wdt: Add support for WDIOF_CARDRESET Date: Mon, 17 Jul 2023 14:41:24 +0800 Message-Id: <20230717064124.1315746-4-huaqian.li@siemens.com> In-Reply-To: <20230717064124.1315746-1-huaqian.li@siemens.com> References: <20230717064124.1315746-1-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..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);