From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EB169C2C6 for ; Mon, 17 Jul 2023 18:22:50 +0000 (UTC) Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8634D199 for ; Mon, 17 Jul 2023 11:22:36 -0700 (PDT) Received: from moin.white.stw.pengutronix.de ([2a0a:edc0:0:b01:1d::7b] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qLSri-0001a3-R3 for netdev@vger.kernel.org; Mon, 17 Jul 2023 20:22:34 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 70DF71F39ED for ; Mon, 17 Jul 2023 18:22:33 +0000 (UTC) Received: from hardanger.blackshift.org (unknown [172.20.34.65]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by bjornoya.blackshift.org (Postfix) with ESMTPS id 39D371F39B9; Mon, 17 Jul 2023 18:22:31 +0000 (UTC) Received: from blackshift.org (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id 08bbeeb2; Mon, 17 Jul 2023 18:22:30 +0000 (UTC) From: Marc Kleine-Budde To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org, kernel@pengutronix.de, Judith Mendez , Hiago De Franco , Tony Lindgren , Marc Kleine-Budde Subject: [PATCH net-next 2/8] can: m_can: Add hrtimer to generate software interrupt Date: Mon, 17 Jul 2023 20:22:23 +0200 Message-Id: <20230717182229.250565-3-mkl@pengutronix.de> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230717182229.250565-1-mkl@pengutronix.de> References: <20230717182229.250565-1-mkl@pengutronix.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 2a0a:edc0:0:b01:1d::7b X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net From: Judith Mendez Introduce timer polling method to MCAN since some SoCs may not have M_CAN interrupt routed to A53 Linux and do not have interrupt property in device tree M_CAN node. On AM62x SoC, MCANs on MCU domain do not have hardware interrupt routed to A53 Linux, instead they will use timer polling method. Add an hrtimer to MCAN class device. Each MCAN will have its own hrtimer instantiated if there is no hardware interrupt found in device tree M_CAN node. The timer 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. Tested-by: Hiago De Franco # Toradex Verdin AM62 Reviewed-by: Tony Lindgren Signed-off-by: Judith Mendez Link: https://lore.kernel.org/all/20230707204714.62964-3-jm@ti.com Signed-off-by: Marc Kleine-Budde --- drivers/net/can/m_can/m_can.c | 32 +++++++++++++++++++++++++- drivers/net/can/m_can/m_can.h | 3 +++ drivers/net/can/m_can/m_can_platform.c | 21 +++++++++++++---- 3 files changed, 51 insertions(+), 5 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index c5af92bcc9c9..13fd84b2e2dd 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_MS 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. @@ -1414,6 +1418,12 @@ static int m_can_start(struct net_device *dev) m_can_enable_all_interrupts(cdev); + if (!dev->irq) { + dev_dbg(cdev->dev, "Start hrtimer\n"); + hrtimer_start(&cdev->hrtimer, ms_to_ktime(HRTIMER_POLL_INTERVAL_MS), + HRTIMER_MODE_REL_PINNED); + } + return 0; } @@ -1568,6 +1578,11 @@ static void m_can_stop(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); + if (!dev->irq) { + dev_dbg(cdev->dev, "Stop hrtimer\n"); + hrtimer_cancel(&cdev->hrtimer); + } + /* disable all interrupts */ m_can_disable_all_interrupts(cdev); @@ -1793,6 +1808,18 @@ 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_MS)); + + return HRTIMER_RESTART; +} + static int m_can_open(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); @@ -1831,7 +1858,7 @@ 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 (dev->irq) { err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, dev); } @@ -2027,6 +2054,9 @@ int m_can_class_register(struct m_can_classdev *cdev) goto clk_disable; } + if (!cdev->net->irq) + cdev->hrtimer.function = &hrtimer_callback; + ret = m_can_dev_setup(cdev); if (ret) goto rx_offload_del; diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index a839dc71dc9b..2ac18ac867a4 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 +94,8 @@ struct m_can_classdev { int is_peripheral; struct mram_cfg mcfg[MRAM_CFG_NUM]; + + struct hrtimer hrtimer; }; 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 94dc82644113..cdb28d6a092c 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 @@ -82,7 +83,7 @@ static int m_can_plat_probe(struct platform_device *pdev) void __iomem *addr; void __iomem *mram_addr; struct phy *transceiver; - int irq, ret = 0; + int irq = 0, ret = 0; mcan_class = m_can_class_allocate_dev(&pdev->dev, sizeof(struct m_can_plat_priv)); @@ -96,12 +97,24 @@ 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; } + if (device_property_present(mcan_class->dev, "interrupts") || + device_property_present(mcan_class->dev, "interrupt-names")) { + irq = platform_get_irq_byname(pdev, "int0"); + if (irq < 0) { + ret = irq; + goto probe_fail; + } + } 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) { -- 2.40.1