From patchwork Wed May 10 20:29:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Judith Mendez X-Patchwork-Id: 92290 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp3907694vqo; Wed, 10 May 2023 13:43:44 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5cjAf37ROCYwSbUXNvpf2RCbyzLO6lc1ReadqeSfBpVi7UWPka5SGKcNcdxZpFfHmMflO/ X-Received: by 2002:a05:6a00:140f:b0:63d:24d0:2c32 with SMTP id l15-20020a056a00140f00b0063d24d02c32mr22558140pfu.33.1683751424291; Wed, 10 May 2023 13:43:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1683751424; cv=none; d=google.com; s=arc-20160816; b=Fs5mdKeIYWRKNtgApGkGboigO1o+tLcQf8x4qUp7mdbaVicBxQmKVRyth+uMfqV+Uq SlcMK7zqtpmgIVbxzM6ZYux1K3NSEGiiQnDrQm8YJ//J39BVBj7gusJakGld3qLyoH4N 2IBZ35pVygVk56q2qO3jUwKhrm0o5DcJ+vJpbrF3GIph+9rS8Mkj78sssFIeG4sP7mdk xJE2txeNtVIoNyRLzeQU2GbgMFPETPeOKTj0nR33atcXjrFmHaM5hGDuctbeC94TcB3T UaPzu4cLPjJY5A3xv+W03glh8wzjOvCqlKuApURbx7cj9+i3JuvYlw8h7NwhKzWas5zX mj/Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=HXuyb7U+oLYksLgi1JFOJoLLBiNOWj3I44a1XEEB9nU=; b=wzexdOLcw2rti+ewjxkCqJdrMxOC6j7OYIezGe+q0udPGMUFpKkPNGnb53sO1lfOti lnhO9tVP5nVVtYa8LmPWIN0a0riw0/2q6keYajDJAf64WUVuCpdT5pRmNFaUFdNbJnlj /5Ic1hPdj0Gw53Hnvy0GzQKEOvU/fg/GOCONEvQPMTY3WGcHmbFvNmoHL0ikYg9mzF7J SG44+/z3emYtoO5lCMQHed+b9H64o+dyUD1JqNeoLRoHSkmgVI855N4iwj9AHq/9BuF7 hYHuybKZWiBBsZjrih7qqPhTkzAF6xqfsLZw3PpeWMLWkWX8qCaBOncfRwJaDSK0wJPC jt/Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=LKIN+UIf; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id h26-20020aa796da000000b0063b630df52asi5800557pfq.252.2023.05.10.13.43.31; Wed, 10 May 2023 13:43:44 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=LKIN+UIf; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236519AbjEJUad (ORCPT + 99 others); Wed, 10 May 2023 16:30:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236398AbjEJUaZ (ORCPT ); Wed, 10 May 2023 16:30:25 -0400 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B6DE558D; Wed, 10 May 2023 13:30:22 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 34AKTr2T028826; Wed, 10 May 2023 15:29:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1683750593; bh=HXuyb7U+oLYksLgi1JFOJoLLBiNOWj3I44a1XEEB9nU=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=LKIN+UIfggXDoxDp12Fk+6Ku6bYJwR+USE7Wt3/iJ9F789090F6tz/vnaG+HWKTbw Kkva08PbPK15IznP6JjLNrcMgChecMElniiXwNPIp0aYuzjrBgUkvwjMQt79xblkS9 VASzKrQOqlddGqGlsMJPsrrRvQ2s5Uird8tigVN0= Received: from DLEE100.ent.ti.com (dlee100.ent.ti.com [157.170.170.30]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 34AKTr8w026216 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 10 May 2023 15:29:53 -0500 Received: from DLEE113.ent.ti.com (157.170.170.24) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Wed, 10 May 2023 15:29:53 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE113.ent.ti.com (157.170.170.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Wed, 10 May 2023 15:29:53 -0500 Received: from a0498204.dal.design.ti.com (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 34AKTqDI003872; Wed, 10 May 2023 15:29:53 -0500 From: Judith Mendez To: , Chandrasekar Ramakrishnan CC: Wolfgang Grandegger , Marc Kleine-Budde , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , , , Schuyler Patton , , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Oliver Hartkopp , Subject: [PATCH v5 2/2] can: m_can: Add hrtimer to generate software interrupt Date: Wed, 10 May 2023 15:29:52 -0500 Message-ID: <20230510202952.27111-3-jm@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230510202952.27111-1-jm@ti.com> References: <20230510202952.27111-1-jm@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1765541333614620722?= X-GMAIL-MSGID: =?utf-8?q?1765541333614620722?= Add an hrtimer to MCAN class device. Each MCAN will have its own hrtimer instantiated if there is no hardware interrupt found and poll-interval property is defined in device tree M_CAN node. The hrtimer will generate a software interrupt every 1 ms. In hrtimer callback, we check if there is a transaction pending by reading a register, then process by calling the isr if there is. Signed-off-by: Judith Mendez --- drivers/net/can/m_can/m_can.c | 28 ++++++++++++++++++++- drivers/net/can/m_can/m_can.h | 4 +++ drivers/net/can/m_can/m_can_platform.c | 35 +++++++++++++++++++++++--- 3 files changed, 63 insertions(+), 4 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index a5003435802b..85009b803c70 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -308,6 +309,9 @@ enum m_can_reg { #define TX_EVENT_MM_MASK GENMASK(31, 24) #define TX_EVENT_TXTS_MASK GENMASK(15, 0) +/* Hrtimer polling interval */ +#define HRTIMER_POLL_INTERVAL 1 + /* The ID and DLC registers are adjacent in M_CAN FIFO memory, * and we can save a (potentially slow) bus round trip by combining * reads and writes to them. @@ -1587,6 +1591,11 @@ static int m_can_close(struct net_device *dev) if (!cdev->is_peripheral) napi_disable(&cdev->napi); + if (cdev->polling) { + dev_dbg(cdev->dev, "Disabling the hrtimer\n"); + hrtimer_cancel(&cdev->hrtimer); + } + m_can_stop(dev); m_can_clk_stop(cdev); free_irq(dev->irq, dev); @@ -1793,6 +1802,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, return NETDEV_TX_OK; } +static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) +{ + struct m_can_classdev *cdev = container_of(timer, struct + m_can_classdev, hrtimer); + + m_can_isr(0, cdev->net); + + hrtimer_forward_now(timer, ms_to_ktime(HRTIMER_POLL_INTERVAL)); + + return HRTIMER_RESTART; +} + static int m_can_open(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); @@ -1831,9 +1852,14 @@ static int m_can_open(struct net_device *dev) err = request_threaded_irq(dev->irq, NULL, m_can_isr, IRQF_ONESHOT, dev->name, dev); - } else { + } else if (!cdev->polling) { err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, dev); + } else { + dev_dbg(cdev->dev, "Start hrtimer\n"); + cdev->hrtimer.function = &hrtimer_callback; + hrtimer_start(&cdev->hrtimer, ms_to_ktime(HRTIMER_POLL_INTERVAL), + HRTIMER_MODE_REL_PINNED); } if (err < 0) { diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index a839dc71dc9b..e9db5cce4e68 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -93,6 +94,9 @@ struct m_can_classdev { int is_peripheral; struct mram_cfg mcfg[MRAM_CFG_NUM]; + + struct hrtimer hrtimer; + bool polling; }; struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv); diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c index 9c1dcf838006..79ad1a3c0060 100644 --- a/drivers/net/can/m_can/m_can_platform.c +++ b/drivers/net/can/m_can/m_can_platform.c @@ -5,6 +5,7 @@ // // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/ +#include #include #include @@ -96,12 +97,40 @@ static int m_can_plat_probe(struct platform_device *pdev) goto probe_fail; addr = devm_platform_ioremap_resource_byname(pdev, "m_can"); - irq = platform_get_irq_byname(pdev, "int0"); - if (IS_ERR(addr) || irq < 0) { - ret = -EINVAL; + if (IS_ERR(addr)) { + ret = PTR_ERR(addr); goto probe_fail; } + irq = platform_get_irq_byname_optional(pdev, "int0"); + if (irq == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto probe_fail; + } + + if (device_property_present(mcan_class->dev, "interrupts") || + device_property_present(mcan_class->dev, "interrupt-names")) + mcan_class->polling = false; + else + mcan_class->polling = true; + + if (!mcan_class->polling && irq < 0) { + ret = -ENXIO; + dev_err_probe(mcan_class->dev, ret, "IRQ int0 not found, polling not activated\n"); + goto probe_fail; + } + + if (mcan_class->polling) { + if (irq > 0) { + mcan_class->polling = false; + dev_info(mcan_class->dev, "Polling enabled, using hardware IRQ\n"); + } else { + dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer"); + hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL_PINNED); + } + } + /* message ram could be shared */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); if (!res) {