From patchwork Thu Sep 19 12:26:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Marangi X-Patchwork-Id: 830207 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 486E61957F8; Thu, 19 Sep 2024 12:28:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726748926; cv=none; b=CoRh2hOEix6cDKODRzDKIpRnM2Dmunrg9i+XF+KnU7ya7p7eMG/Y/PY+SBgmBfVGeBAcCFHH6Ub7sWB4GYpLYz+rSsMlb5ZOZ4NnIYIi6Bl2VGX34TkHh3n38iSzvs7gYSXZ0z4jIBcmMDuRo1dPYkSzCirnz6u195ACkuJViN4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726748926; c=relaxed/simple; bh=yYlI6tTus0ZiU3Ar9IfNHE31m1w2Fawm/zJ9bxgzhQg=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=b4j703gFapTO/uU8tPDC9zmkqwRgKd1Eed8qYWQVQT7z2xFQwQcnIn1F0CbOGavEnHHnKrDstPfRIlISfiz9T/oRh20zxmaOrGrZh6ocPaOS3PcvY2zjNrjrfvvnMnr0detJF1QrwjNtURj/v39wZeXvxCHZ2oXQbjFgon116Lw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=du1W/Xmw; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="du1W/Xmw" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-42cbaf9bfdbso6936595e9.0; Thu, 19 Sep 2024 05:28:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726748924; x=1727353724; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=jJ9vLOIwefl3iNMuVxcYqoEs8VcLhp7ZSQofYSHIYJU=; b=du1W/XmwmMeA596nJHe0MPYjPAbpDMmaYNa0L+qos6IqfIH6jzneeSddECUqZ+M/yN qNKRjMUCdoJgFe10bi8aToblceXEEgTc9Hj+EiRxFRek1ptc9qYhjTlOv4CaQyyTu+Dk 9uz0zGgcbvJQOeI/2pdYoL170Rc9Xza/P/M4XqpPKMTYnL2X7BGEY/TF6eI9Gj1qDeA4 KPlDPAKnASFW4qTb91ljgvaT9ez8BYDFnHJkVvorz6jZCOCrCabuiJfE+pTGn2/Ya1LJ kOGb/d6La8/FnBXRS8f+bfkGDI76SLiLg8k9m2/gwUnNlF0qPjrzaIzfauNEZPkC/ULX vO5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726748924; x=1727353724; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=jJ9vLOIwefl3iNMuVxcYqoEs8VcLhp7ZSQofYSHIYJU=; b=KPwTDAPqzcaGMTX20mh7OkpSjFDF67zXn9uu6zU5EL4gCA7V+O5HxzOg3jH/XBtzvw ZKAT9c0S+48Mv7FGLXE2SzbfLVMy7akwQRJe++VjCL4mOr0EmDxyrkuJWA2/Ws7Q5RrI HOgqe6TnB5S5WiAdom0wFByQipBbmex7iLtSLO9MfjW0SVj2/MDqg9KoViz4b/hOVuE+ G/IsZJT+NwHeNs+WmgEodzOoTqoEwWnaW/bneILPucOuLRZx04hFAELNTQW84CoGOLdP pH+K2qeedHgcc1y72f+n0i7p2Bt9MhtaFenEO3jaV+t6M5D3l6zQTquDiCnCPkPHPcvq s2yA== X-Forwarded-Encrypted: i=1; AJvYcCUpmE6NIBCqwnP+WXoLHyCeijeyfWUO5Kk40eKW+zuB66VmEywCX2o295uirOafID3hhC0U8Dg+h3/Rd5nl@vger.kernel.org, AJvYcCVPqixIggjebsi3Cm1nfT0LB0xnYZGYfhJ+OTATj2tbrzZ7F5dgQKmkaltXbyCiAdk1qL63OsooE9X+@vger.kernel.org, AJvYcCXJfYSWdYnPXPtYBU4kEUNND+Ts91Ag/uFe0w+kFFJEofxwIN8+/LBvg2wlywoiBUtQD3pZ0TqEn9w1by9W8sA=@vger.kernel.org X-Gm-Message-State: AOJu0YzhZ3GEnwUMhH74nHf0N4o4FpFy5QGYE04dTf6DjRH3E4SKn9Bb zwHxQfqqB5EjNv1IRSrQVeRQB890u8CU9od7sCSiw2tjlXnrGtTq X-Google-Smtp-Source: AGHT+IE/Io2i6GSdXSw+/wIr/wc5aJW3eYk5lzU37goMz09UdJc4IALbDWG79muCgWJFt7Z4DxwA3A== X-Received: by 2002:a05:600c:34c2:b0:42c:bad0:6c16 with SMTP id 5b1f17b1804b1-42d9070baa1mr144760475e9.2.1726748923270; Thu, 19 Sep 2024 05:28:43 -0700 (PDT) Received: from localhost.localdomain (93-34-90-105.ip49.fastwebnet.it. [93.34.90.105]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-42e754ce37bsm20509115e9.48.2024.09.19.05.28.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Sep 2024 05:28:42 -0700 (PDT) From: Christian Marangi To: Wim Van Sebroeck , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Christian Marangi , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Lorenzo Bianconi , upstream@airoha.com Subject: [PATCH 1/2] dt-bindings: watchdog: airoha: document watchdog for Airoha EN7581 Date: Thu, 19 Sep 2024 14:26:17 +0200 Message-ID: <20240919122759.10456-1-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Document watchdog for Airoha EN7581. This SoC implement a simple watchdog that supports a max timeout of 28 seconds. The watchdog ticks on half the BUS clock and require the BUS frequency to be provided. Signed-off-by: Christian Marangi --- .../bindings/watchdog/airoha,en7581-wdt.yaml | 39 +++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/airoha,en7581-wdt.yaml diff --git a/Documentation/devicetree/bindings/watchdog/airoha,en7581-wdt.yaml b/Documentation/devicetree/bindings/watchdog/airoha,en7581-wdt.yaml new file mode 100644 index 000000000000..47210a5990ee --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/airoha,en7581-wdt.yaml @@ -0,0 +1,39 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/watchdog/airoha,en7581-wdt.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Airoha EN7581 Watchdog Timer + +maintainers: + - Christian Marangi + +allOf: + - $ref: watchdog.yaml# + +properties: + compatible: + const: airoha,en7581-wdt + + reg: + maxItems: 1 + + clock-frequency: + description: BUS frequency in Hz (timer ticks at half the BUS freq) + const: 300000000 + +required: + - compatible + - reg + - clock-frequency + +unevaluatedProperties: false + +examples: + - | + watchdog@1fbf0100 { + compatible = "airoha,en7581-wdt"; + reg = <0x1fbf0100 0x3c>; + clock-frequency = <300000000>; + }; From patchwork Thu Sep 19 12:26:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Marangi X-Patchwork-Id: 829823 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 964DB19B3C5; Thu, 19 Sep 2024 12:28:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726748928; cv=none; b=nVVZmTEJMJVa08Nk6U75hflIjMGc2irCMHwQbKL28TVQylKQQg3yMkCphWjHbuH4kozmIx9vcqwoF9tAst8X/0QlKeZ9fWDjuvKmts7XbIyvxLwIQyv1mLmcE+vmhIX5tVCQz4ilLIYQP1GsHYEeSozNyg1qLWyXw2T8qttf0Z8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726748928; c=relaxed/simple; bh=mwljqCgcRmSy3M6FsoDSXPczCloXkYijL+Rk8OlQFZo=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eOGBFBLngs8V/AYt//zrUfqQdGWV4KbIZ46qoi/jn02nSYtis2YC5S8YkAjEaD2ey8dBE4JIIID6K4liIyOcmVZ3N8/PZBPcpNUz4tBhewn1+c6ZIDMTfUDgK7l/qudXwTB+voM2pr0+8mIsi8r+HkvG/v2LxAoUjcwhSUPhKXU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=KPXfzG2p; arc=none smtp.client-ip=209.85.128.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KPXfzG2p" Received: by mail-wm1-f41.google.com with SMTP id 5b1f17b1804b1-42cd74c0d16so7045055e9.1; Thu, 19 Sep 2024 05:28:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726748925; x=1727353725; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=4ZqHWHKD8G90msmHfdERi2k3H3OBi9Wvldi9rwajcD0=; b=KPXfzG2pySCVYcK89+dD+xa4BTkpCR33v+9nEqBYGuJzYRbGKhI4++Tt886Ac82uKK 7jcV6qbV9CfCinoH5pFusQOSfG693khAXMQkQQwzKU2r0aa7vGuliX/eJDkLCHw4Tm2d 5ILmPydJpblRL+QkO4C4AfEW/mfR3+BJnlmEPSwAcz0R61TnEbvTtAjV75em1pkBuS1l 69N7p+fBzNhjV/AcLiTTOjoc836dH1cWs7mNMJoVCTYowBje8INC3GXjA0b1XoZvBYfw i4fz/WnwzMzK30/jFR3zIBWd/8F+vjuzQ8YfWc4rf+0EoTG65yoXqT5H5HXwCx4/r1m5 lCkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726748925; x=1727353725; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4ZqHWHKD8G90msmHfdERi2k3H3OBi9Wvldi9rwajcD0=; b=WbiFa1bgmySdsHn3jfm53aeRyH26lr9ud0dRi6czlpRUJQkYsEDGbgnJ08kY3LVJpR 4JEk8B539Iz5cIFC1zMn8yuvHVdQeyh5gwMIGrA5IgvRvEb6oyU2vexvm4uA3Xu9TaTV Af9AxhacjAZglc/JD2+1PKBE+SRQkasysaDWsdrUi/jhFvLo9L54khC648omKTntzCWz Dh8ZW3E/1K7xuQsKTwO8MmpqVWSmBAA0vciNd6JkAcupHHSacj+z6/cZb1/BJ04BUPAF ovp8wCzWckLpuzJuvfPjn1zn/C9pgrWrWiiQZMJ4of26Bva+l+dPmnEwHDumtnGcvibR rStQ== X-Forwarded-Encrypted: i=1; AJvYcCVtBfm1W7fladQ9guTW3hwu4ywvEQlLmd1x8g78X+TGjaJERAX+1XJjPn/Pz1DAo50Ky06K7qXvcqDO@vger.kernel.org, AJvYcCX3b7R+s1lYsV6l6C7o8L+x2PBsgs5aNZ5iASF0ga2vT2l81RiMCm2daYYn3W+baxs0lnbswDO2SkzClm2x@vger.kernel.org, AJvYcCXQOj3CC1/FA4X9rHxoUAIqf9Zr45hz9BNYtfZsq0JypjkI2ama6b369wKwn2SIKxlSkqvWJ9R1b7nanovbZwQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwdnFxZFeI40bVIRtEBi3bN4Iuvvgj8Q5tQBN68k4f3qgP62kp+ viZ/VRit8+fOEwNpWIJj9qv9sCdE9LUC36STtVMpTyeV5e4J6dvz X-Google-Smtp-Source: AGHT+IFJwIc4Nxom3IhTXGEmqaxOGv5kDtNBRunlLTJlfp3TwDEqrB+MzbNB8Rt+ewiWPkz/yftdoQ== X-Received: by 2002:a05:600c:19c8:b0:42c:b187:bde9 with SMTP id 5b1f17b1804b1-42cdb579f3cmr200240945e9.30.1726748924586; Thu, 19 Sep 2024 05:28:44 -0700 (PDT) Received: from localhost.localdomain (93-34-90-105.ip49.fastwebnet.it. [93.34.90.105]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-42e754ce37bsm20509115e9.48.2024.09.19.05.28.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Sep 2024 05:28:43 -0700 (PDT) From: Christian Marangi To: Wim Van Sebroeck , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Christian Marangi , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Lorenzo Bianconi , upstream@airoha.com Subject: [PATCH 2/2] watchdog: Add support for Airoha EN7851 watchdog Date: Thu, 19 Sep 2024 14:26:18 +0200 Message-ID: <20240919122759.10456-2-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240919122759.10456-1-ansuelsmth@gmail.com> References: <20240919122759.10456-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add support for Airoha EN7851 watchdog. This is a very basic watchdog with no pretimeout support, max timeout is 28 seconds and it ticks based on half the SoC bus clock. Signed-off-by: Christian Marangi --- drivers/watchdog/Kconfig | 8 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/airoha_wdt.c | 214 ++++++++++++++++++++++++++++++++++ 3 files changed, 223 insertions(+) create mode 100644 drivers/watchdog/airoha_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 85eea38dbdf4..be4616d18b29 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -394,6 +394,14 @@ config SL28CPLD_WATCHDOG # ARM Architecture +config AIROHA_WATCHDOG + tristate "Airoha EN7581 Watchdog" + depends on ARCH_AIROHA || COMPILE_TEST + select WATCHDOG_CORE + help + Watchdog timer embedded into Airoha SoC. This will reboot your + system when the timeout is reached. + config ARM_SP805_WATCHDOG tristate "ARM SP805 Watchdog" depends on (ARM || ARM64 || COMPILE_TEST) && ARM_AMBA diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 2d1117564f5b..32a0f689a9be 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o obj-$(CONFIG_ARMADA_37XX_WATCHDOG) += armada_37xx_wdt.o +obj-$(CONFIG_AIROHA_WATCHDOG) += airoha_wdt.o obj-$(CONFIG_ASM9260_WATCHDOG) += asm9260_wdt.o obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o diff --git a/drivers/watchdog/airoha_wdt.c b/drivers/watchdog/airoha_wdt.c new file mode 100644 index 000000000000..3bbcd7c1f2c4 --- /dev/null +++ b/drivers/watchdog/airoha_wdt.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Airoha Watchdog Driver + * + * Copyright (c) 2024, AIROHA All rights reserved. + * + * Mayur Kumar + * Christian Marangi + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Base address of timer and watchdog registers */ +#define TIMER_CTRL 0x0 +#define WDT_ENABLE BIT(25) +#define WDT_TIMER_INTERRUPT BIT(21) +/* Timer3 is used as Watchdog Timer */ +#define WDT_TIMER_ENABLE BIT(5) +#define WDT_TIMER_LOAD_VALUE 0x2c +#define WDT_TIMER_CUR_VALUE 0x30 +#define WDT_TIMER_VAL GENMASK(31, 0) +#define WDT_RELOAD 0x38 +#define WDT_RLD BIT(0) + +/* Airoha watchdog structure description */ +struct airoha_wdt_desc { + struct watchdog_device wdog_dev; + unsigned int wdt_freq; + void __iomem *base; +}; + +#define WDT_HEARTBEAT 24 +static int heartbeat = WDT_HEARTBEAT; +module_param(heartbeat, int, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. (default=" + __MODULE_STRING(WDT_HEARTBEAT) ")"); + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static int airoha_wdt_start(struct watchdog_device *wdog_dev) +{ + struct airoha_wdt_desc *airoha_wdt = watchdog_get_drvdata(wdog_dev); + u32 val; + + val = readl(airoha_wdt->base + TIMER_CTRL); + val |= (WDT_TIMER_ENABLE | WDT_ENABLE | WDT_TIMER_INTERRUPT); + writel(val, airoha_wdt->base + TIMER_CTRL); + val = wdog_dev->timeout * airoha_wdt->wdt_freq; + writel(val, airoha_wdt->base + WDT_TIMER_LOAD_VALUE); + + return 0; +} + +static int airoha_wdt_stop(struct watchdog_device *wdog_dev) +{ + struct airoha_wdt_desc *airoha_wdt = watchdog_get_drvdata(wdog_dev); + u32 val; + + val = readl(airoha_wdt->base + TIMER_CTRL); + val &= (~WDT_ENABLE & ~WDT_TIMER_ENABLE); + writel(val, airoha_wdt->base + TIMER_CTRL); + + return 0; +} + +static int airoha_wdt_ping(struct watchdog_device *wdog_dev) +{ + struct airoha_wdt_desc *airoha_wdt = watchdog_get_drvdata(wdog_dev); + u32 val; + + val = readl(airoha_wdt->base + WDT_RELOAD); + val |= WDT_RLD; + writel(val, airoha_wdt->base + WDT_RELOAD); + + return 0; +} + +static int airoha_wdt_set_timeout(struct watchdog_device *wdog_dev, unsigned int timeout) +{ + wdog_dev->timeout = timeout; + + if (watchdog_active(wdog_dev)) { + airoha_wdt_stop(wdog_dev); + return airoha_wdt_start(wdog_dev); + } + + return 0; +} + +static unsigned int airoha_wdt_get_timeleft(struct watchdog_device *wdog_dev) +{ + struct airoha_wdt_desc *airoha_wdt = watchdog_get_drvdata(wdog_dev); + u32 val; + + val = readl(airoha_wdt->base + WDT_TIMER_CUR_VALUE); + return DIV_ROUND_UP(val, airoha_wdt->wdt_freq); +} + +static const struct watchdog_info airoha_wdt_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, + .identity = "Airoha Watchdog", +}; + +static const struct watchdog_ops airoha_wdt_ops = { + .owner = THIS_MODULE, + .start = airoha_wdt_start, + .stop = airoha_wdt_stop, + .ping = airoha_wdt_ping, + .set_timeout = airoha_wdt_set_timeout, + .get_timeleft = airoha_wdt_get_timeleft, +}; + +static int airoha_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct watchdog_device *wdog_dev; + struct airoha_wdt_desc *airoha_wdt; + int ret; + + airoha_wdt = devm_kzalloc(dev, sizeof(*airoha_wdt), GFP_KERNEL); + if (!airoha_wdt) + return -ENOMEM; + + airoha_wdt->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(airoha_wdt->base)) + return PTR_ERR(airoha_wdt->base); + + ret = device_property_read_u32(dev, "clock-frequency", + &airoha_wdt->wdt_freq); + if (ret) + return -EINVAL; + + /* Watchdog ticks at half the bus rate */ + airoha_wdt->wdt_freq /= 2; + + /* Initialize struct watchdog device */ + wdog_dev = &airoha_wdt->wdog_dev; + wdog_dev->timeout = heartbeat; + wdog_dev->info = &airoha_wdt_info; + wdog_dev->ops = &airoha_wdt_ops; + /* Bus 300MHz, watchdog 150MHz, 28 seconds */ + wdog_dev->max_timeout = FIELD_MAX(WDT_TIMER_VAL) / airoha_wdt->wdt_freq; + wdog_dev->parent = dev; + + watchdog_set_drvdata(wdog_dev, airoha_wdt); + watchdog_set_nowayout(wdog_dev, nowayout); + watchdog_stop_on_unregister(wdog_dev); + + ret = devm_watchdog_register_device(dev, wdog_dev); + if (ret) + return ret; + + platform_set_drvdata(pdev, airoha_wdt); + return 0; +} + +static int airoha_wdt_suspend(struct device *dev) +{ + struct airoha_wdt_desc *airoha_wdt = dev_get_drvdata(dev); + + if (watchdog_active(&airoha_wdt->wdog_dev)) + airoha_wdt_stop(&airoha_wdt->wdog_dev); + + return 0; +} + +static int airoha_wdt_resume(struct device *dev) +{ + struct airoha_wdt_desc *airoha_wdt = dev_get_drvdata(dev); + + if (watchdog_active(&airoha_wdt->wdog_dev)) { + airoha_wdt_start(&airoha_wdt->wdog_dev); + airoha_wdt_ping(&airoha_wdt->wdog_dev); + } + return 0; +} + +static const struct of_device_id airoha_wdt_of_match[] = { + { .compatible = "airoha,en7581-wdt", }, + { }, +}; + +MODULE_DEVICE_TABLE(of, airoha_wdt_of_match); + +static DEFINE_SIMPLE_DEV_PM_OPS(airoha_wdt_pm_ops, airoha_wdt_suspend, airoha_wdt_resume); + +static struct platform_driver airoha_wdt_driver = { + .probe = airoha_wdt_probe, + .driver = { + .name = "airoha-wdt", + .pm = pm_sleep_ptr(&airoha_wdt_pm_ops), + .of_match_table = airoha_wdt_of_match, + }, +}; + +module_platform_driver(airoha_wdt_driver); + +MODULE_AUTHOR("Mayur Kumar "); +MODULE_AUTHOR("Christian Marangi "); +MODULE_DESCRIPTION("Airoha Watchdog Driver"); +MODULE_LICENSE("GPL");