From patchwork Mon Oct 7 06:34:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chin-Ting Kuo X-Patchwork-Id: 13824120 Received: from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BF2B15B13C; Mon, 7 Oct 2024 06:34:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.20.114.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282857; cv=none; b=Wn5Kmo7npKAVOa6YLF/1UBXWjcpXy2KriTAbFOb5zex3z6q2zDqCBxFJ47MLXKElDD4vvHP0b5PJHPdLk/p5aCcyGkS28X3z0BQ3LpxCs4AsL0YmxQyOUhOaIpUNAWkNqlOsCo8cTmTfQaJSKQoSOsP1n/F+vbcNNc8yquoqm9M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282857; c=relaxed/simple; bh=QKnsrnHH4rF8FOuJI0h9zOVDsyQQPZgRzSvWRKKjZhw=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GSu57UaMDTfaoQDbxF6ZRWekoiAs1wbIzcN9SmU+imYjR+FpYeEuTe9tj/qSrk1C44imzLQJG3GEtpHnEjkH2B35WTopToU0giJevhpZDTyEOI6bYN6ZQ5P9/wzTb0BuquVSdOQxEJNrKjC3kv5DuJWcmUPrw2NBMPu3mO69HG8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com; spf=pass smtp.mailfrom=aspeedtech.com; arc=none smtp.client-ip=211.20.114.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aspeedtech.com Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Mon, 7 Oct 2024 14:34:08 +0800 Received: from aspeedtech.com (192.168.10.152) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Mon, 7 Oct 2024 14:34:08 +0800 From: Chin-Ting Kuo To: , , , , , , , , , , , , CC: , , , , Subject: [PATCH 1/4] dt-bindings: watchdog: aspeed: Add property for WDT SW reset Date: Mon, 7 Oct 2024 14:34:05 +0800 Message-ID: <20241007063408.2360874-2-chin-ting_kuo@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> References: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add "aspeed,restart-sw" property to distinguish normal WDT reset from system restart triggered by SW consciously. Signed-off-by: Chin-Ting Kuo --- .../bindings/watchdog/aspeed,ast2400-wdt.yaml | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml b/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml index be78a9865584..6cc3604c295a 100644 --- a/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml +++ b/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml @@ -95,6 +95,17 @@ properties: array with the first word defined using the AST2600_WDT_RESET1_* macros, and the second word defined using the AST2600_WDT_RESET2_* macros. + aspeed,restart-sw: + $ref: /schemas/types.yaml#/definitions/flag + description: > + Normally, ASPEED WDT reset may occur when system hangs or reboot + triggered by SW consciously. However, system doesn't know whether the + restart is triggered by SW consciously since the reset event flag is + the same as normal WDT timeout reset. With this property, SW can + restart the system immediately and directly without wait for WDT + timeout occurs. The reset event flag is also different from the normal + WDT reset. This property is only supported since AST2600 platform. + required: - compatible - reg From patchwork Mon Oct 7 06:34:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chin-Ting Kuo X-Patchwork-Id: 13824119 Received: from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE575149C6A; Mon, 7 Oct 2024 06:34:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.20.114.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282855; cv=none; b=p4vxD3NeI9Jl36oS6BjmDF6/HqIHGfZZGCOCs/1VMHCVNqk6qd04vvbS1fw/VnVEX8xAf6IiVil9JgJsYi27lfiR7gWICTnbnRWMiM2q9oqVh35O+DNeoOz2SzD2J1t4wpoyks2+RUurqLYoBhcUAGJN8pD+06VlmP/JxdF3r2w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282855; c=relaxed/simple; bh=SfVok2QnDPH32Kmkcj3p1nt9RMkzDbWzinsZZpIrOOA=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=k3Vu8tlKmX46KdTqSSJNyXcIr49wlRGpc2aL6CSLhtcCrvMSLS12UR6X49HJYUJViy45040InJuPSP3Z9nN5pNa7KMQUXGHZerPy/PTa0CNWAx3odxblxbChVYBE7PjBQH1Tz2OJhUtVD5pDDAJGEDDI2oASh/4yzXeBvX3pCZQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com; spf=pass smtp.mailfrom=aspeedtech.com; arc=none smtp.client-ip=211.20.114.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aspeedtech.com Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Mon, 7 Oct 2024 14:34:08 +0800 Received: from aspeedtech.com (192.168.10.152) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Mon, 7 Oct 2024 14:34:08 +0800 From: Chin-Ting Kuo To: , , , , , , , , , , , , CC: , , , , Subject: [PATCH 2/4] ARM: dts: aspeed: Add WDT controller into alias field Date: Mon, 7 Oct 2024 14:34:06 +0800 Message-ID: <20241007063408.2360874-3-chin-ting_kuo@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> References: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add WDT controller into alias field. After that, WDT index, used to distinguish different WDT controllers in the driver, can be gotten by using of_alias_get_id dts API. Signed-off-by: Chin-Ting Kuo --- arch/arm/boot/dts/aspeed/aspeed-g4.dtsi | 2 ++ arch/arm/boot/dts/aspeed/aspeed-g5.dtsi | 3 +++ arch/arm/boot/dts/aspeed/aspeed-g6.dtsi | 4 ++++ 3 files changed, 9 insertions(+) diff --git a/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi index 78c967812492..d8b4136d0ca0 100644 --- a/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi +++ b/arch/arm/boot/dts/aspeed/aspeed-g4.dtsi @@ -29,6 +29,8 @@ aliases { serial3 = &uart4; serial4 = &uart5; serial5 = &vuart; + watchdog0 = &wdt1; + watchdog1 = &wdt2; }; cpus { diff --git a/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi index 57a699a7c149..4dd220bca617 100644 --- a/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi +++ b/arch/arm/boot/dts/aspeed/aspeed-g5.dtsi @@ -30,6 +30,9 @@ aliases { serial3 = &uart4; serial4 = &uart5; serial5 = &vuart; + watchdog0 = &wdt1; + watchdog1 = &wdt2; + watchdog2 = &wdt3; }; cpus { diff --git a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi index 8ed715bd53aa..c0a47c795fff 100644 --- a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi +++ b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi @@ -40,6 +40,10 @@ aliases { mdio1 = &mdio1; mdio2 = &mdio2; mdio3 = &mdio3; + watchdog0 = &wdt1; + watchdog1 = &wdt2; + watchdog2 = &wdt3; + watchdog3 = &wdt4; }; From patchwork Mon Oct 7 06:34:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chin-Ting Kuo X-Patchwork-Id: 13824121 Received: from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23C18166F29; Mon, 7 Oct 2024 06:34:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.20.114.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282859; cv=none; b=soF+z0Z7LAKgd3CprHwjXkE11Bh2nAz8dGF6M0f6YrmuVm83dsAzpRWF6QT/LQUedhi7r01lJeit1iRYBTqanldcP6OpfCoSrqjoOTQNd4Q1usfB+y5qv7EThfwmo7xixoyCPLQOHyQreDb+EYc2RaD5uSHrYW3gENT9i22LI9I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728282859; c=relaxed/simple; bh=qYp2NSNH26YXqLb0alu3zTeRveBbzU2MY4MMcJQ6DBk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=al+XnDl+Xj0QieFEVNbO3dXJkII/S/V3GJBXxyKCNAkkqOLNs3uFN4IuCjLWK9jY+VZp1+ukSv2gyBl76R9TbshI8trlDWnFWDQcGhhbRZf/3EO76x3aMCF+NvacoedPqr+rg2GJJ7P+4xsLWG9GRUv35ArImQKFccBXvWfXG6E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com; spf=pass smtp.mailfrom=aspeedtech.com; arc=none smtp.client-ip=211.20.114.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aspeedtech.com Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Mon, 7 Oct 2024 14:34:08 +0800 Received: from aspeedtech.com (192.168.10.152) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Mon, 7 Oct 2024 14:34:08 +0800 From: Chin-Ting Kuo To: , , , , , , , , , , , , CC: , , , , Subject: [PATCH 3/4] watchdog: aspeed: Update bootstatus handling Date: Mon, 7 Oct 2024 14:34:07 +0800 Message-ID: <20241007063408.2360874-4-chin-ting_kuo@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> References: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Update the bootstatus according to the latest design guide from the OpenBMC shown as below. https://github.com/openbmc/docs/blob/master/designs/bmc-reboot-cause-update.md#proposed-design In short, - WDIOF_EXTERN1 => system is reset by Software - WDIOF_CARDRESET => system is reset by WDT - Others => other reset events, e.g., power on reset. On AST2400 platform, only a bit, SCU3C[1], represents that the system is reset by WDT1 or WDT2. On AST2500 platform, SCU3C[4:2] are WDT reset flags. SCU3C[4]: system is reset by WDT3. SCU3C[3]: system is reset by WDT2. SCU3C[2]: system is reset by WDT1. On AST2600 platform, SCU074[31:16] are WDT reset flags. SCU074[31:28]: system is reset by WDT4 SCU074[31]: system is reset by WDT4 software reset. SCU074[27:24]: system is reset by WDT3 SCU074[27]: system is reset by WDT3 software reset. SCU074[23:20]: system is reset by WDT2 SCU074[23]: system is reset by WDT2 software reset. SCU074[19:16]: system is reset by WDT1 SCU074[19]: system is reset by WDT1 software reset. Signed-off-by: Chin-Ting Kuo --- drivers/watchdog/aspeed_wdt.c | 109 +++++++++++++++++++++++++++++++--- 1 file changed, 101 insertions(+), 8 deletions(-) diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c index b4773a6aaf8c..68eaada8a564 100644 --- a/drivers/watchdog/aspeed_wdt.c +++ b/drivers/watchdog/aspeed_wdt.c @@ -11,10 +11,12 @@ #include #include #include +#include #include #include #include #include +#include #include static bool nowayout = WATCHDOG_NOWAYOUT; @@ -22,15 +24,41 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +/* AST SCU Register for System Reset Event Log Register Set + * ast2600 is scu074 ast2400/2500 is scu03c + */ +#define AST2400_SCU_SYS_RESET_STATUS 0x3c +#define AST2400_SCU_SYS_RESET_WDT_MASK 0x1 +#define AST2400_SCU_SYS_RESET_WDT_MASK_SHIFT 1 + +#define AST2500_SCU_SYS_RESET_WDT_MASK 0x1 +#define AST2500_SCU_SYS_RESET_WDT_MASK_SHIFT 2 + +#define AST2600_SCU_SYS_RESET_STATUS 0x74 +#define AST2600_SCU_SYS_RESET_WDT_MASK 0xf +#define AST2600_SCU_SYS_RESET_WDT_SW_MASK 0x8 +#define AST2600_SCU_SYS_RESET_WDT_MASK_SHIFT 16 + +struct aspeed_wdt_scu { + const char *compatible; + u32 reset_status_reg; + u32 wdt_reset_mask; + u32 wdt_sw_reset_mask; + u32 wdt_reset_mask_shift; +}; + struct aspeed_wdt_config { u32 ext_pulse_width_mask; u32 irq_shift; u32 irq_mask; + struct aspeed_wdt_scu scu; }; struct aspeed_wdt { struct watchdog_device wdd; void __iomem *base; + int idx; u32 ctrl; const struct aspeed_wdt_config *cfg; }; @@ -39,18 +67,39 @@ static const struct aspeed_wdt_config ast2400_config = { .ext_pulse_width_mask = 0xff, .irq_shift = 0, .irq_mask = 0, + .scu = { + .compatible = "aspeed,ast2400-scu", + .reset_status_reg = AST2400_SCU_SYS_RESET_STATUS, + .wdt_reset_mask = AST2400_SCU_SYS_RESET_WDT_MASK, + .wdt_sw_reset_mask = 0, + .wdt_reset_mask_shift = AST2400_SCU_SYS_RESET_WDT_MASK_SHIFT, + }, }; static const struct aspeed_wdt_config ast2500_config = { .ext_pulse_width_mask = 0xfffff, .irq_shift = 12, .irq_mask = GENMASK(31, 12), + .scu = { + .compatible = "aspeed,ast2500-scu", + .reset_status_reg = AST2400_SCU_SYS_RESET_STATUS, + .wdt_reset_mask = AST2500_SCU_SYS_RESET_WDT_MASK, + .wdt_sw_reset_mask = 0, + .wdt_reset_mask_shift = AST2500_SCU_SYS_RESET_WDT_MASK_SHIFT, + }, }; static const struct aspeed_wdt_config ast2600_config = { .ext_pulse_width_mask = 0xfffff, .irq_shift = 0, .irq_mask = GENMASK(31, 10), + .scu = { + .compatible = "aspeed,ast2600-scu", + .reset_status_reg = AST2600_SCU_SYS_RESET_STATUS, + .wdt_reset_mask = AST2600_SCU_SYS_RESET_WDT_MASK, + .wdt_sw_reset_mask = AST2600_SCU_SYS_RESET_WDT_SW_MASK, + .wdt_reset_mask_shift = AST2600_SCU_SYS_RESET_WDT_MASK_SHIFT, + }, }; static const struct of_device_id aspeed_wdt_of_table[] = { @@ -213,6 +262,52 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd, return 0; } +static int aspeed_wdt_get_bootstatus(struct device *dev, + struct aspeed_wdt *wdt) +{ + struct device_node *np = dev->of_node; + struct aspeed_wdt_scu scu = wdt->cfg->scu; + struct regmap *scu_base; + u32 reset_mask_width; + u32 reset_mask_shift; + u32 status; + int ret; + + wdt->idx = of_alias_get_id(np, "watchdog"); + if (wdt->idx < 0) + wdt->idx = 0; + + scu_base = syscon_regmap_lookup_by_compatible(scu.compatible); + if (IS_ERR(scu_base)) + return PTR_ERR(scu_base); + + ret = regmap_read(scu_base, scu.reset_status_reg, &status); + if (ret) + return ret; + + /* On AST2400, only a bit used to represent WDT reset */ + if (of_device_is_compatible(np, "aspeed,ast2400-wdt")) + wdt->idx = 0; + + reset_mask_width = hweight32(scu.wdt_reset_mask); + reset_mask_shift = scu.wdt_reset_mask_shift + + reset_mask_width * wdt->idx; + + if (status & (scu.wdt_sw_reset_mask << reset_mask_shift)) + wdt->wdd.bootstatus = WDIOF_EXTERN1; + else if (status & (scu.wdt_reset_mask << reset_mask_shift)) + wdt->wdd.bootstatus = WDIOF_CARDRESET; + else + wdt->wdd.bootstatus = WDIOF_UNKNOWN; + + ret = regmap_write(scu_base, scu.reset_status_reg, + scu.wdt_reset_mask << reset_mask_shift); + if (ret) + return ret; + + return 0; +} + /* access_cs0 shows if cs0 is accessible, hence the reverted bit */ static ssize_t access_cs0_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -312,7 +407,6 @@ static int aspeed_wdt_probe(struct platform_device *pdev) struct device_node *np; const char *reset_type; u32 duration; - u32 status; int ret; wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); @@ -458,14 +552,13 @@ static int aspeed_wdt_probe(struct platform_device *pdev) writel(duration - 1, wdt->base + WDT_RESET_WIDTH); } - status = readl(wdt->base + WDT_TIMEOUT_STATUS); - if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY) { - wdt->wdd.bootstatus = WDIOF_CARDRESET; + ret = aspeed_wdt_get_bootstatus(dev, wdt); + if (ret) + return ret; - if (of_device_is_compatible(np, "aspeed,ast2400-wdt") || - of_device_is_compatible(np, "aspeed,ast2500-wdt")) - wdt->wdd.groups = bswitch_groups; - } + if (of_device_is_compatible(np, "aspeed,ast2400-wdt") || + of_device_is_compatible(np, "aspeed,ast2500-wdt")) + wdt->wdd.groups = bswitch_groups; dev_set_drvdata(dev, wdt); From patchwork Mon Oct 7 06:34:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chin-Ting Kuo X-Patchwork-Id: 13824122 Received: from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E381171E43; 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dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aspeedtech.com Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Mon, 7 Oct 2024 14:34:09 +0800 Received: from aspeedtech.com (192.168.10.152) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Mon, 7 Oct 2024 14:34:09 +0800 From: Chin-Ting Kuo To: , , , , , , , , , , , , CC: , , , , Subject: [PATCH 4/4] watchdog: aspeed: Add support for SW restart Date: Mon, 7 Oct 2024 14:34:08 +0800 Message-ID: <20241007063408.2360874-5-chin-ting_kuo@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> References: <20241007063408.2360874-1-chin-ting_kuo@aspeedtech.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 WDT reset can be triggered when system hangs or a deliberate SW restart scenario. Originally, system can only know it is reset by WDT through a reset flag. However, since AST2600, a SW reset mechanism is created, SW can trigger the reset event consciously and directly without wait for WDT timeout. This function can be achieved by adding "aspeed,restart-sw" property in dts. After that, an independent reset event flag will be set after system reset by SW. Signed-off-by: Chin-Ting Kuo --- drivers/watchdog/aspeed_wdt.c | 40 ++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c index 68eaada8a564..eefca972dfa4 100644 --- a/drivers/watchdog/aspeed_wdt.c +++ b/drivers/watchdog/aspeed_wdt.c @@ -61,6 +61,7 @@ struct aspeed_wdt { int idx; u32 ctrl; const struct aspeed_wdt_config *cfg; + u32 flags; }; static const struct aspeed_wdt_config ast2400_config = { @@ -130,6 +131,11 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table); #define WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION BIT(0) #define WDT_RESET_MASK1 0x1c #define WDT_RESET_MASK2 0x20 +#define WDT_SW_RESET_CTRL 0x24 +#define WDT_SW_RESET_COUNT_CLEAR 0xDEADDEAD +#define WDT_SW_RESET_ENABLE 0xAEEDF123 +#define WDT_SW_RESET_MASK1 0x28 +#define WDT_SW_RESET_MASK2 0x2c /* * WDT_RESET_WIDTH controls the characteristics of the external pulse (if @@ -170,6 +176,9 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table); #define WDT_DEFAULT_TIMEOUT 30 #define WDT_RATE_1MHZ 1000000 +/* WDT behavior control flag */ +#define WDT_RESTART_SYSTEM_SW 0x00000001 + static struct aspeed_wdt *to_aspeed_wdt(struct watchdog_device *wdd) { return container_of(wdd, struct aspeed_wdt, wdd); @@ -249,11 +258,31 @@ static int aspeed_wdt_set_pretimeout(struct watchdog_device *wdd, return 0; } +static void aspeed_wdt_sw_reset(struct watchdog_device *wdd) +{ + struct aspeed_wdt *wdt = to_aspeed_wdt(wdd); + u32 ctrl = WDT_CTRL_RESET_MODE_SOC | + WDT_CTRL_RESET_SYSTEM; + + writel(ctrl, wdt->base + WDT_CTRL); + writel(WDT_SW_RESET_COUNT_CLEAR, + wdt->base + WDT_SW_RESET_CTRL); + writel(WDT_SW_RESET_ENABLE, wdt->base + WDT_SW_RESET_CTRL); + + /* system must be reset immediately */ + mdelay(1000); +} + static int aspeed_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) { struct aspeed_wdt *wdt = to_aspeed_wdt(wdd); + if (wdt->flags & WDT_RESTART_SYSTEM_SW) { + aspeed_wdt_sw_reset(wdd); + return 0; + } + wdt->ctrl &= ~WDT_CTRL_BOOT_SECONDARY; aspeed_wdt_enable(wdt, 128 * WDT_RATE_1MHZ / 1000); @@ -521,8 +550,11 @@ static int aspeed_wdt_probe(struct platform_device *pdev) ret = of_property_read_u32_array(np, "aspeed,reset-mask", reset_mask, nrstmask); if (!ret) { writel(reset_mask[0], wdt->base + WDT_RESET_MASK1); - if (nrstmask > 1) + writel(reset_mask[0], wdt->base + WDT_SW_RESET_MASK1); + if (nrstmask > 1) { writel(reset_mask[1], wdt->base + WDT_RESET_MASK2); + writel(reset_mask[1], wdt->base + WDT_SW_RESET_MASK2); + } } } @@ -552,6 +584,12 @@ static int aspeed_wdt_probe(struct platform_device *pdev) writel(duration - 1, wdt->base + WDT_RESET_WIDTH); } + wdt->flags = 0; + if (!of_device_is_compatible(np, "aspeed,ast2400-wdt") && + !of_device_is_compatible(np, "aspeed,ast2500-wdt") && + of_property_read_bool(np, "aspeed,restart-sw")) + wdt->flags |= WDT_RESTART_SYSTEM_SW; + ret = aspeed_wdt_get_bootstatus(dev, wdt); if (ret) return ret;