From patchwork Fri Apr 14 10:23:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bharat Bhushan X-Patchwork-Id: 673590 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 5E8F8C77B6E for ; Fri, 14 Apr 2023 10:24:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230281AbjDNKYV (ORCPT ); Fri, 14 Apr 2023 06:24:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230257AbjDNKYU (ORCPT ); Fri, 14 Apr 2023 06:24:20 -0400 Received: from mx0b-0016f401.pphosted.com (mx0b-0016f401.pphosted.com [67.231.156.173]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A86B183D2; Fri, 14 Apr 2023 03:24:18 -0700 (PDT) Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 33E9Trub011351; Fri, 14 Apr 2023 03:23:55 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=pfpt0220; bh=o3NfsPA1eYPelyWewdGAoP/nTS/DBpUYKLDW2bpX6zI=; b=CwmJ21RAHXeURMBjV0BiM8c3i+7BuiyIw1CgLrEmndiiILlNHvkbiv4lL+1Rqm9vq+qr zc/E6GSSJ5D4hVOPrn+YAYBLmE/htdqFQwpENgRLqx4RXdwDu4k8Fz8EkLetRC4PvJbJ xIsUuC0JRIzjL+l3QHJAbL+HW23L8qwryytvqfSg+RSxt8Yan2r+JEh+cirtiFmOer0x hkuWWUwNu5wlu0hWRft63gyGQTfmyzxCDeIJN3Ei5zCEC48cbYpHxG29p5jmZVWIKvLV 5R4Vbxgzt0gCsxeSGPv5Gyd/STRQsXpdMROksvfZx/gdxY+WScd2D2H2PRTaFAATp1JF hQ== Received: from dc5-exch02.marvell.com ([199.233.59.182]) by mx0b-0016f401.pphosted.com (PPS) with ESMTPS id 3px3fwgcdy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Fri, 14 Apr 2023 03:23:54 -0700 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Fri, 14 Apr 2023 03:23:52 -0700 Received: from bbhushan2.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.48 via Frontend Transport; Fri, 14 Apr 2023 03:23:49 -0700 From: Bharat Bhushan To: , , , , , , CC: Bharat Bhushan Subject: [PATCH 2/2] Watchdog: Add octeontx2 GTI watchdog driver Date: Fri, 14 Apr 2023 15:53:42 +0530 Message-ID: <20230414102342.23696-2-bbhushan2@marvell.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230414102342.23696-1-bbhushan2@marvell.com> References: <20230414102342.23696-1-bbhushan2@marvell.com> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: UpBBPB4vNCSrPdx_2l9SUSl_Szauw7XP X-Proofpoint-GUID: UpBBPB4vNCSrPdx_2l9SUSl_Szauw7XP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-14_04,2023-04-14_01,2023-02-09_01 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org GTI watchdog timer are programmed in "interrupt + del3t + reset mode" and del3t traps are not enabled. GTI watchdog exception flow is: - 1st timer expiration generates watchdog interrupt. - 2nd timer expiration is ignored - On 3rd timer expiration will trigger a system-wide core reset. Signed-off-by: Bharat Bhushan --- drivers/watchdog/Kconfig | 9 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/octeontx2_wdt.c | 238 +++++++++++++++++++++++++++++++ 3 files changed, 248 insertions(+) create mode 100644 drivers/watchdog/octeontx2_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index f0872970daf9..31ff282c62ad 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -2212,4 +2212,13 @@ config KEEMBAY_WATCHDOG To compile this driver as a module, choose M here: the module will be called keembay_wdt. +config OCTEONTX2_WATCHDOG + tristate "OCTEONTX2 Watchdog driver" + depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT) + help + OCTEONTX2 GTI hardware supports watchdog timer. This watchdog timer are + programmed in "interrupt + del3t + reset" mode. On first expiry it will + generate interrupt. Second expiry (del3t) is ignored and system will reset + on final timer expiry. + endif # WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 9cbf6580f16c..aa1b813ad1f9 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -230,3 +230,4 @@ obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o obj-$(CONFIG_SL28CPLD_WATCHDOG) += sl28cpld_wdt.o +obj-$(CONFIG_OCTEONTX2_WATCHDOG) += octeontx2_wdt.o diff --git a/drivers/watchdog/octeontx2_wdt.c b/drivers/watchdog/octeontx2_wdt.c new file mode 100644 index 000000000000..7b78a092e83f --- /dev/null +++ b/drivers/watchdog/octeontx2_wdt.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Marvell Octeontx2 Watchdog driver + * + * Copyright (C) 2023 Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +/* GTI CWD Watchdog Registers */ +#define GTI_CWD_GLOBAL_WDOG_IDX 63 +#define GTI_CWD_WDOG (0x8 * GTI_CWD_GLOBAL_WDOG_IDX) +#define GTI_CWD_WDOG_MODE_INT_DEL3T_RST 0x3 +#define GTI_CWD_WDOG_MODE_MASK 0x3 +#define GTI_CWD_WDOG_LEN_SHIFT 4 +#define GTI_CWD_WDOG_CNT_SHIFT 20 + +/* GTI Per-core Watchdog Interrupt Register */ +#define GTI_CWD_INT 0x200 +#define GTI_CWD_INT_PENDING_STATUS (1ULL << GTI_CWD_GLOBAL_WDOG_IDX) + +/* GTI Per-core Watchdog Interrupt Enable Clear Register */ +#define GTI_CWD_INT_ENA_CLR 0x210 +#define GTI_CWD_INT_ENA_CLR_VAL (1ULL << GTI_CWD_GLOBAL_WDOG_IDX) + +/* GTI Per-core Watchdog Interrupt Enable Set Register */ +#define GTI_CWD_INT_ENA_SET 0x218 +#define GTI_CWD_INT_ENA_SET_VAL (1ULL << GTI_CWD_GLOBAL_WDOG_IDX) + +/* GTI Per-core Watchdog Poke Registers */ +#define GTI_CWD_POKE (0x10000 + 0x8 * GTI_CWD_GLOBAL_WDOG_IDX) +#define GTI_CWD_POKE_VAL (1ULL << GTI_CWD_GLOBAL_WDOG_IDX) + +struct octeontx2_wdt_priv { + struct watchdog_device wdev; + void __iomem *base; + u64 clock_freq; + int irq; +}; + +static irqreturn_t octeontx2_wdt_interrupt(int irq, void *data) +{ + panic("Kernel Watchdog"); + return IRQ_HANDLED; +} + +static int octeontx2_wdt_ping(struct watchdog_device *wdev) +{ + struct octeontx2_wdt_priv *priv = watchdog_get_drvdata(wdev); + + writeq(GTI_CWD_POKE_VAL, priv->base + GTI_CWD_POKE); + return 0; +} + +static int octeontx2_wdt_start(struct watchdog_device *wdev) +{ + struct octeontx2_wdt_priv *priv = watchdog_get_drvdata(wdev); + u64 regval; + + set_bit(WDOG_HW_RUNNING, &wdev->status); + + /* Clear any pending interrupt */ + writeq(GTI_CWD_INT_PENDING_STATUS, priv->base + GTI_CWD_INT); + + /* Enable Interrupt */ + writeq(GTI_CWD_INT_ENA_SET_VAL, priv->base + GTI_CWD_INT_ENA_SET); + + /* Set (Interrupt + SCP interrupt (DEL3T) + core domain reset) Mode */ + regval = readq(priv->base + GTI_CWD_WDOG); + regval |= GTI_CWD_WDOG_MODE_INT_DEL3T_RST; + writeq(regval, priv->base + GTI_CWD_WDOG); + + return 0; +} + +static int octeontx2_wdt_stop(struct watchdog_device *wdev) +{ + struct octeontx2_wdt_priv *priv = watchdog_get_drvdata(wdev); + u64 regval; + + /* Disable Interrupt */ + writeq(GTI_CWD_INT_ENA_CLR_VAL, priv->base + GTI_CWD_INT_ENA_CLR); + + /* Set GTI_CWD_WDOG.Mode = 0 to stop the timer */ + regval = readq(priv->base + GTI_CWD_WDOG); + regval &= ~GTI_CWD_WDOG_MODE_MASK; + writeq(regval, priv->base + GTI_CWD_WDOG); + + return 0; +} + +static int octeontx2_wdt_settimeout(struct watchdog_device *wdev, + unsigned int timeout) +{ + struct octeontx2_wdt_priv *priv = watchdog_get_drvdata(wdev); + u64 timeout_wdog, regval; + + /* Update new timeout */ + wdev->timeout = timeout; + + /* Get clock cycles from timeout in second */ + timeout_wdog = (u64)timeout * priv->clock_freq; + + /* Watchdog counts in 1024 cycle steps */ + timeout_wdog = timeout_wdog >> 10; + + /* + * Hardware allows programming of upper 16-bits of 24-bits cycles + * Round up and use upper 16-bits only. + * Set max if timeout more than h/w supported + */ + timeout_wdog = (timeout_wdog + 0xff) >> 8; + if (timeout_wdog >= 0x10000) + timeout_wdog = 0xffff; + + /* + * GTI_CWD_WDOG.LEN have only upper 16-bits of 24-bits + * GTI_CWD_WDOG.CNT, need addition shift of 8. + */ + regval = readq(priv->base + GTI_CWD_WDOG); + regval &= GTI_CWD_WDOG_MODE_MASK; + regval |= ((timeout_wdog) << (GTI_CWD_WDOG_CNT_SHIFT + 8)) | + (timeout_wdog << GTI_CWD_WDOG_LEN_SHIFT); + writeq(regval, priv->base + GTI_CWD_WDOG); + return 0; +} + +static const struct watchdog_info octeontx2_wdt_ident = { + .identity = "OcteonTX2 watchdog", + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | + WDIOF_CARDRESET, +}; + +static const struct watchdog_ops octeontx2_wdt_ops = { + .owner = THIS_MODULE, + .start = octeontx2_wdt_start, + .stop = octeontx2_wdt_stop, + .ping = octeontx2_wdt_ping, + .set_timeout = octeontx2_wdt_settimeout, +}; + +static int octeontx2_wdt_probe(struct platform_device *pdev) +{ + struct octeontx2_wdt_priv *priv; + struct device *dev = &pdev->dev; + struct watchdog_device *wdog_dev; + int irq; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return dev_err_probe(&pdev->dev, PTR_ERR(priv->base), + "reg property not valid/found\n"); + + priv->clock_freq = arch_timer_get_cntfrq(); + + wdog_dev = &priv->wdev; + wdog_dev->info = &octeontx2_wdt_ident, + wdog_dev->ops = &octeontx2_wdt_ops, + wdog_dev->parent = dev; + wdog_dev->min_timeout = 1; + wdog_dev->max_timeout = 16; + wdog_dev->max_hw_heartbeat_ms = 16000; + wdog_dev->timeout = 8; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "IRQ resource not found\n"); + return -ENODEV; + } + + err = request_irq(irq, octeontx2_wdt_interrupt, 0, pdev->name, priv); + if (err) { + dev_err(dev, "cannot register interrupt handler %d\n", err); + return err; + } + + priv->irq = irq; + watchdog_set_drvdata(wdog_dev, priv); + platform_set_drvdata(pdev, priv); + watchdog_init_timeout(wdog_dev, wdog_dev->timeout, dev); + octeontx2_wdt_settimeout(wdog_dev, wdog_dev->timeout); + watchdog_stop_on_reboot(wdog_dev); + watchdog_stop_on_unregister(wdog_dev); + + err = devm_watchdog_register_device(dev, wdog_dev); + if (err) { + free_irq(irq, priv); + return err; + } + + dev_info(dev, "Watchdog enabled (timeout=%d sec)\n", wdog_dev->timeout); + return 0; +} + +static int octeontx2_wdt_remove(struct platform_device *pdev) +{ + struct octeontx2_wdt_priv *priv = platform_get_drvdata(pdev); + + if (priv->irq) + free_irq(priv->irq, priv); + + return 0; +} + +static const struct of_device_id octeontx2_wdt_of_match[] = { + { .compatible = "marvell-octeontx2-wdt", }, + { }, +}; +MODULE_DEVICE_TABLE(of, octeontx2_wdt_of_match); + +static struct platform_driver octeontx2_wdt_driver = { + .driver = { + .name = "octeontx2-wdt", + .of_match_table = octeontx2_wdt_of_match, + }, + .probe = octeontx2_wdt_probe, + .remove = octeontx2_wdt_remove, +}; +module_platform_driver(octeontx2_wdt_driver); + +MODULE_AUTHOR("Bharat Bhushan "); +MODULE_DESCRIPTION("OcteonTX2 watchdog driver");