From patchwork Mon May 1 22:31:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Judith Mendez X-Patchwork-Id: 678191 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 8CFE2C7EE21 for ; Mon, 1 May 2023 22:32:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232773AbjEAWcL (ORCPT ); Mon, 1 May 2023 18:32:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230391AbjEAWcK (ORCPT ); Mon, 1 May 2023 18:32:10 -0400 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F05D26BC; Mon, 1 May 2023 15:32:07 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 341MVM4B048701; Mon, 1 May 2023 17:31:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1682980282; bh=QbE1TH3sVfoluwJIROm95neyUgLF++CTx3j/cYwtMZ4=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=lmfhPw6Yzy5TAc3C2F345PzgukaiKwljSj7vA/WABaE9RuGunQv3qMNCT5Gi117Nt 2nHrBWteZRndJriIeLtSplQLrgnW0U9PHNORkCJU8AjYExO7unUs3X0K2vzydOUFfi Pmf2mA+aZizr16eDQMz/Pt0HdrjMjxi/+Te64NYU= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 341MVM3s027917 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 1 May 2023 17:31:22 -0500 Received: from DFLE105.ent.ti.com (10.64.6.26) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Mon, 1 May 2023 17:31:22 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE105.ent.ti.com (10.64.6.26) 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; Mon, 1 May 2023 17:31:21 -0500 Received: from a0498204.dal.design.ti.com (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 341MVLEI023009; Mon, 1 May 2023 17:31:21 -0500 From: Judith Mendez To: Chandrasekar Ramakrishnan , Wolfgang Grandegger , Marc Kleine-Budde , Krzysztof Kozlowski CC: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , , , , Schuyler Patton , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Rob Herring , , , Oliver Hartkopp , Simon Horman Subject: [PATCH v3 2/4] can: m_can: Add hrtimer to generate software interrupt Date: Mon, 1 May 2023 17:31:19 -0500 Message-ID: <20230501223121.21663-3-jm@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230501223121.21663-1-jm@ti.com> References: <20230501223121.21663-1-jm@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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 --- Changelog: v1: 1. Sort list of includes 2. Create a define for HR_TIMER_POLL_INTERVAL 3. Fix indentations and style issues/warnings 4. Change polling variable to type bool 5. Change platform_get_irq to optional so not to print error msg 6. Move error check for addr directly after assignment 7. Print appropriate error msg with dev_err_probe insead of dev_dbg v2: 1. Add poll-interval to MCAN class device to check if poll-interval propery is present in MCAN node, this enables timer polling method. 2. Add 'polling' flag to MCAN class device to check if a device is using timer polling method 3. Check if both timer polling and hardware interrupt are enabled for a MCAN device, default to hardware interrupt mode if both are enabled. 4. Change ms_to_ktime() to ns_to_ktime() 5. Remove newlines, tabs, and restructure if/else section. drivers/net/can/m_can/m_can.c | 29 ++++++++++++++++++++-- drivers/net/can/m_can/m_can.h | 4 ++++ drivers/net/can/m_can/m_can_platform.c | 33 +++++++++++++++++++++++--- 3 files changed, 61 insertions(+), 5 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index a5003435802b..e1ac0c1d85a3 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); @@ -1827,13 +1848,17 @@ static int m_can_open(struct net_device *dev) } INIT_WORK(&cdev->tx_work, m_can_tx_work_queue); - 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..ec2277d89c73 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 +97,38 @@ 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, "poll-interval")) + mcan_class->polling = 1; + + if (!mcan_class->polling && irq < 0) { + ret = -ENXIO; + dev_err_probe(mcan_class->dev, ret, "IRQ int0 not found and polling not + activated\n"); + goto probe_fail; + } + + if (mcan_class->polling) { + if (irq > 0) { + mcan_class->polling = 0; + dev_dbg(mcan_class->dev, "Polling enabled and hardware IRQ found, use 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) {