From patchwork Fri Jan 10 07:04:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SmlheGluIFl1ICjkv57lrrbpkasp?= X-Patchwork-Id: 215179 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, MIME_BASE64_TEXT, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C516AC33CA2 for ; Fri, 10 Jan 2020 07:04:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8449A20848 for ; Fri, 10 Jan 2020 07:04:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="ofMOTP7U" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727253AbgAJHEj (ORCPT ); Fri, 10 Jan 2020 02:04:39 -0500 Received: from mailgw01.mediatek.com ([210.61.82.183]:9968 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726692AbgAJHEj (ORCPT ); Fri, 10 Jan 2020 02:04:39 -0500 X-UUID: ebf83bd77a214b06b02407080af0feb5-20200110 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=UBU/JotGyaVC80F/EKU+cYPfez0p2KHHBLk51Y3ha+c=; b=ofMOTP7UQLwQXfSpLDUtl6xTgUGDVUqgVJlJJDTCSxup5tMl5k3lRqmmqPtKArlU9ycecI1+Fxd+G/mjFLUjdh8HYW3X3qTwVAKFIHV+4RMPSgMpm3SLIy41fLr51vzClyUDukp1s7t7QzC8Qm+z3bN9SUY/cgak8OL5lyz2wrc=; X-UUID: ebf83bd77a214b06b02407080af0feb5-20200110 Received: from mtkcas09.mediatek.inc [(172.21.101.178)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 602646178; Fri, 10 Jan 2020 15:04:31 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 10 Jan 2020 15:04:01 +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; Fri, 10 Jan 2020 15:03:57 +0800 From: Jiaxin Yu To: , , , , , , , , , , , CC: , , Jiaxin Yu Subject: [PATCH v11 2/3] watchdog: mtk_wdt: mt8183: Add reset controller Date: Fri, 10 Jan 2020 15:04:21 +0800 Message-ID: <1578639862-14480-3-git-send-email-jiaxin.yu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1578639862-14480-1-git-send-email-jiaxin.yu@mediatek.com> References: <1578639862-14480-1-git-send-email-jiaxin.yu@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Add reset controller API in watchdog driver. Besides watchdog, MTK toprgu module alsa provide sub-system (eg, audio, camera, codec and connectivity) software reset functionality. Signed-off-by: yong.liang Signed-off-by: Jiaxin Yu Reviewed-by: Yingjoe Chen Reviewed-by: Philipp Zabel Reviewed-by: Rob Herring Reviewed-by: Guenter Roeck --- drivers/watchdog/mtk_wdt.c | 99 +++++++++++++++++++++++++++++++++++++- 1 file changed, 98 insertions(+), 1 deletion(-) -- 2.18.0 diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 9c3d0033260d..e88aacb0404d 100644 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -9,6 +9,8 @@ * Based on sunxi_wdt.c */ +#include +#include #include #include #include @@ -16,10 +18,11 @@ #include #include #include +#include #include +#include #include #include -#include #define WDT_MAX_TIMEOUT 31 #define WDT_MIN_TIMEOUT 1 @@ -44,6 +47,9 @@ #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 +59,90 @@ 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 toprgu_sw_rst_num; }; +static const struct mtk_wdt_data mt8183_data = { + .toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM, +}; + +static int toprgu_reset_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + 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 = readl(data->wdt_base + WDT_SWSYSRST); + if (assert) + tmp |= BIT(id); + else + 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_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return toprgu_reset_update(rcdev, id, true); +} + +static int toprgu_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return toprgu_reset_update(rcdev, id, false); +} + +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 = devm_reset_controller_register(&pdev->dev, &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 +243,7 @@ static int mtk_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct mtk_wdt_dev *mtk_wdt; + const struct mtk_wdt_data *wdt_data; int err; mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL); @@ -190,6 +279,13 @@ 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 = of_device_get_match_data(dev); + if (wdt_data) { + err = toprgu_register_reset_controller(pdev, + wdt_data->toprgu_sw_rst_num); + if (err) + return err; + } return 0; } @@ -219,6 +315,7 @@ static int mtk_wdt_resume(struct device *dev) static const struct of_device_id mtk_wdt_dt_ids[] = { { .compatible = "mediatek,mt6589-wdt" }, + { .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);