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can: ctucanfd: CTU CAN FD open-source IP core - platform/SoC support.
Platform bus adaptation for CTU CAN FD open-source IP core. The core has been tested together with OpenCores SJA1000 modified to be CAN FD frames tolerant on MicroZed Zynq based MZ_APO education kits designed by Petr Porazil from PiKRON.com company. FPGA design https://gitlab.fel.cvut.cz/canbus/zynq/zynq-can-sja1000-top. The kit description at the Computer Architectures course pages https://cw.fel.cvut.cz/wiki/courses/b35apo/documentation/mz_apo/start . Kit carrier board and mechanics design source files https://gitlab.com/pikron/projects/mz_apo/microzed_apo The work is documented in Martin Jeřábek's diploma theses Open-source and Open-hardware CAN FD Protocol Support https://dspace.cvut.cz/handle/10467/80366 . Link: https://lore.kernel.org/all/4d5c53499bafe7717815f948801bd5aedaa05c12.1647904780.git.pisa@cmp.felk.cvut.cz Signed-off-by: Pavel Pisa <[email protected]> Signed-off-by: Martin Jerabek <[email protected]> Signed-off-by: Ondrej Ille <[email protected]> Signed-off-by: Marc Kleine-Budde <[email protected]>
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‎drivers/net/can/ctucanfd/Kconfig

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@@ -20,3 +20,15 @@ config CAN_CTUCANFD_PCI
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The project providing FPGA design for Intel EP4CGX15 based DB4CGX15
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PCIe board with PiKRON.com designed transceiver riser shield is available
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at https://gitlab.fel.cvut.cz/canbus/pcie-ctucanfd .
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config CAN_CTUCANFD_PLATFORM
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tristate "CTU CAN-FD IP core platform (FPGA, SoC) driver"
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depends on CAN_CTUCANFD
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depends on OF || COMPILE_TEST
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help
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The core has been tested together with OpenCores SJA1000
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modified to be CAN FD frames tolerant on MicroZed Zynq based
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MZ_APO education kits designed by Petr Porazil from PiKRON.com
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company. FPGA design https://gitlab.fel.cvut.cz/canbus/zynq/zynq-can-sja1000-top.
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The kit description at the Computer Architectures course pages
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https://cw.fel.cvut.cz/wiki/courses/b35apo/documentation/mz_apo/start .

‎drivers/net/can/ctucanfd/Makefile

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@@ -7,3 +7,4 @@ obj-$(CONFIG_CAN_CTUCANFD) := ctucanfd.o
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ctucanfd-y := ctucanfd_base.o
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obj-$(CONFIG_CAN_CTUCANFD_PCI) += ctucanfd_pci.o
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obj-$(CONFIG_CAN_CTUCANFD_PLATFORM) += ctucanfd_platform.o

‎drivers/net/can/ctucanfd/ctucanfd_platform.c

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// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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*
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* CTU CAN FD IP Core
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*
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* Copyright (C) 2015-2018 Ondrej Ille <[email protected]> FEE CTU
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* Copyright (C) 2018-2021 Ondrej Ille <[email protected]> self-funded
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* Copyright (C) 2018-2019 Martin Jerabek <[email protected]> FEE CTU
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* Copyright (C) 2018-2022 Pavel Pisa <[email protected]> FEE CTU/self-funded
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*
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* Project advisors:
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* Jiri Novak <[email protected]>
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* Pavel Pisa <[email protected]>
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*
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* Department of Measurement (http://meas.fel.cvut.cz/)
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* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
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* Czech Technical University (http://www.cvut.cz/)
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******************************************************************************/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "ctucanfd.h"
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#define DRV_NAME "ctucanfd"
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static void ctucan_platform_set_drvdata(struct device *dev,
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struct net_device *ndev)
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{
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struct platform_device *pdev = container_of(dev, struct platform_device,
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dev);
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platform_set_drvdata(pdev, ndev);
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}
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/**
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* ctucan_platform_probe - Platform registration call
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* @pdev: Handle to the platform device structure
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*
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* This function does all the memory allocation and registration for the CAN
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* device.
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*
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* Return: 0 on success and failure value on error
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*/
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static int ctucan_platform_probe(struct platform_device *pdev)
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{
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struct resource *res; /* IO mem resources */
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struct device *dev = &pdev->dev;
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void __iomem *addr;
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int ret;
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unsigned int ntxbufs;
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int irq;
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/* Get the virtual base address for the device */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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addr = devm_ioremap_resource(dev, res);
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if (IS_ERR(addr)) {
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dev_err(dev, "Cannot remap address.\n");
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ret = PTR_ERR(addr);
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goto err;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "Cannot find interrupt.\n");
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ret = irq;
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goto err;
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}
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/* Number of tx bufs might be change in HW for future. If so,
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* it will be passed as property via device tree
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*/
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ntxbufs = 4;
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ret = ctucan_probe_common(dev, addr, irq, ntxbufs, 0,
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1, ctucan_platform_set_drvdata);
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if (ret < 0)
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platform_set_drvdata(pdev, NULL);
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err:
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return ret;
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}
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/**
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* ctucan_platform_remove - Unregister the device after releasing the resources
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* @pdev: Handle to the platform device structure
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*
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* This function frees all the resources allocated to the device.
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* Return: 0 always
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*/
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static int ctucan_platform_remove(struct platform_device *pdev)
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{
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struct net_device *ndev = platform_get_drvdata(pdev);
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struct ctucan_priv *priv = netdev_priv(ndev);
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netdev_dbg(ndev, "ctucan_remove");
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unregister_candev(ndev);
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pm_runtime_disable(&pdev->dev);
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netif_napi_del(&priv->napi);
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free_candev(ndev);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume);
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/* Match table for OF platform binding */
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static const struct of_device_id ctucan_of_match[] = {
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{ .compatible = "ctu,ctucanfd-2", },
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{ .compatible = "ctu,ctucanfd", },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(of, ctucan_of_match);
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static struct platform_driver ctucanfd_driver = {
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.probe = ctucan_platform_probe,
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.remove = ctucan_platform_remove,
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.driver = {
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.name = DRV_NAME,
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.pm = &ctucan_platform_pm_ops,
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.of_match_table = ctucan_of_match,
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},
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};
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module_platform_driver(ctucanfd_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Martin Jerabek");
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MODULE_DESCRIPTION("CTU CAN FD for platform");

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