From patchwork Wed Oct 16 05:59:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiaxin Yu X-Patchwork-Id: 11192413 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8204A14ED for ; Wed, 16 Oct 2019 06:01:15 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 178052067D for ; Wed, 16 Oct 2019 06:01:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="LOHOH1HU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 178052067D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 3A7D91670; Wed, 16 Oct 2019 08:00:22 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 3A7D91670 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1571205672; bh=vKaugpInW+Epdizl+SYSqJJq47IciVzGxGCHtUc1/3I=; h=From:To:Date:In-Reply-To:References:Cc:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=LOHOH1HUunWMGH0B9Q1aOt8gP2wgcbAgnhkpbdqcLu07NgUNip1O4peHpGCD2Gn8y WMcO4LBH/g+xUEcFrj7rvmyvukdhfdU/cOOOZyq4yptxZZqgPrKtnhUIJuvecRH7LM GpKaWTBAe3iraFhGnNRsqC4vykYRpb2MnNejeQX8= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id F1694F80377; Wed, 16 Oct 2019 07:59:30 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id 06767F80369; Wed, 16 Oct 2019 07:59:26 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: * X-Spam-Status: No, score=1.0 required=5.0 tests=RDNS_NONE,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from mailgw01.mediatek.com (unknown [210.61.82.183]) by alsa1.perex.cz (Postfix) with ESMTP id 2797DF80322 for ; Wed, 16 Oct 2019 07:59:19 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 2797DF80322 X-UUID: dce1ce46f3a44923a4da5420cda6ea70-20191016 X-UUID: dce1ce46f3a44923a4da5420cda6ea70-20191016 Received: from mtkcas06.mediatek.inc [(172.21.101.30)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 1877522701; Wed, 16 Oct 2019 13:59:14 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 16 Oct 2019 13:59:11 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 16 Oct 2019 13:59:10 +0800 From: Jiaxin Yu To: , , , , Date: Wed, 16 Oct 2019 13:59:08 +0800 Message-ID: <1571205548-13704-3-git-send-email-jiaxin.yu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1571205548-13704-1-git-send-email-jiaxin.yu@mediatek.com> References: <1571205548-13704-1-git-send-email-jiaxin.yu@mediatek.com> MIME-Version: 1.0 X-MTK: N Cc: alsa-devel@alsa-project.org, yong.liang@mediatek.com, lgirdwood@gmail.com, jiaxin.yu@mediatek.com, tzungbi@google.com, linux-mediatek@lists.infradead.org, eason.yen@mediatek.com, linux-arm-kernel@lists.infradead.org Subject: [alsa-devel] [PATCH v4 2/2] watchdog: mtk_wdt: mt8183: Add reset controller X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: "yong.liang" Add reset controller API in watchdog driver. Besides watchdog, MTK toprgu module also provide sub-system (eg, audio, camera, codec and connectivity) software reset functionality. Signed-off-by: yong.liang Reviewed-by: Yingjoe Chen Reviewed-by: Yingjoe Chen --- drivers/watchdog/Kconfig | 1 + drivers/watchdog/mtk_wdt.c | 111 ++++++++++++++++++++++++++++++++++++- 2 files changed, 111 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 2e07caab9db2..629249fe5305 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -717,6 +717,7 @@ config MEDIATEK_WATCHDOG tristate "Mediatek SoCs watchdog support" depends on ARCH_MEDIATEK || COMPILE_TEST select WATCHDOG_CORE + select RESET_CONTROLLER help Say Y here to include support for the watchdog timer in Mediatek SoCs. diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 9c3d0033260d..d29484c7940a 100644 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -9,6 +9,9 @@ * Based on sunxi_wdt.c */ +#include +#include +#include #include #include #include @@ -16,10 +19,12 @@ #include #include #include +#include #include +#include +#include #include #include -#include #define WDT_MAX_TIMEOUT 31 #define WDT_MIN_TIMEOUT 1 @@ -44,6 +49,9 @@ #define WDT_SWRST 0x14 #define WDT_SWRST_KEY 0x1209 +#define WDT_SWSYSRST 0x18U +#define WDT_SWSYS_RST_KEY 0x88000000 + #define DRV_NAME "mtk-wdt" #define DRV_VERSION "1.0" @@ -53,8 +61,99 @@ static unsigned int timeout; struct mtk_wdt_dev { struct watchdog_device wdt_dev; void __iomem *wdt_base; + spinlock_t lock; /* protects WDT_SWSYSRST reg */ + struct reset_controller_dev rcdev; +}; + +struct mtk_wdt_data { + int sw_rst_num; }; +static const struct mtk_wdt_data mt2712_data = { + .sw_rst_num = MT2712_TOPRGU_SW_RST_NUM, +}; + +static const struct mtk_wdt_data mt8183_data = { + .sw_rst_num = MT8183_TOPRGU_SW_RST_NUM, +}; + +static int toprgu_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + unsigned int tmp; + unsigned long flags; + struct mtk_wdt_dev *data = + container_of(rcdev, struct mtk_wdt_dev, rcdev); + + spin_lock_irqsave(&data->lock, flags); + + tmp = __raw_readl(data->wdt_base + WDT_SWSYSRST); + tmp |= BIT(id); + tmp |= WDT_SWSYS_RST_KEY; + writel(tmp, data->wdt_base + WDT_SWSYSRST); + + spin_unlock_irqrestore(&data->lock, flags); + + return 0; +} + +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + unsigned int tmp; + unsigned long flags; + struct mtk_wdt_dev *data = + container_of(rcdev, struct mtk_wdt_dev, rcdev); + + spin_lock_irqsave(&data->lock, flags); + + tmp = __raw_readl(data->wdt_base + WDT_SWSYSRST); + tmp &= ~BIT(id); + tmp |= WDT_SWSYS_RST_KEY; + writel(tmp, data->wdt_base + WDT_SWSYSRST); + + spin_unlock_irqrestore(&data->lock, flags); + + return 0; +} + +static int toprgu_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = toprgu_reset_assert(rcdev, id); + if (ret) + return ret; + + return toprgu_reset_deassert(rcdev, id); +} + +static const struct reset_control_ops toprgu_reset_ops = { + .assert = toprgu_reset_assert, + .deassert = toprgu_reset_deassert, + .reset = toprgu_reset, +}; + +static int toprgu_register_reset_controller(struct platform_device *pdev, + int rst_num) +{ + int ret; + struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev); + + spin_lock_init(&mtk_wdt->lock); + + mtk_wdt->rcdev.owner = THIS_MODULE; + mtk_wdt->rcdev.nr_resets = rst_num; + mtk_wdt->rcdev.ops = &toprgu_reset_ops; + mtk_wdt->rcdev.of_node = pdev->dev.of_node; + ret = reset_controller_register(&mtk_wdt->rcdev); + if (ret != 0) + dev_err(&pdev->dev, + "couldn't register wdt reset controller: %d\n", ret); + return ret; +} + static int mtk_wdt_restart(struct watchdog_device *wdt_dev, unsigned long action, void *data) { @@ -155,6 +254,7 @@ static int mtk_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct mtk_wdt_dev *mtk_wdt; + struct mtk_wdt_data *wdt_data; int err; mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL); @@ -190,6 +290,13 @@ static int mtk_wdt_probe(struct platform_device *pdev) dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n", mtk_wdt->wdt_dev.timeout, nowayout); + wdt_data = (struct mtk_wdt_data *)of_device_get_match_data(dev); + if (wdt_data) { + err = toprgu_register_reset_controller(pdev, + wdt_data->sw_rst_num); + if (err) + return err; + } return 0; } @@ -218,7 +325,9 @@ static int mtk_wdt_resume(struct device *dev) #endif static const struct of_device_id mtk_wdt_dt_ids[] = { + { .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data }, { .compatible = "mediatek,mt6589-wdt" }, + { .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);