1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * 4 * CTU CAN FD IP Core 5 * 6 * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@gmail.com> FEE CTU 7 * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@gmail.com> self-funded 8 * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@gmail.com> FEE CTU 9 * Copyright (C) 2018-2022 Pavel Pisa <pisa@cmp.felk.cvut.cz> FEE CTU/self-funded 10 * 11 * Project advisors: 12 * Jiri Novak <jnovak@fel.cvut.cz> 13 * Pavel Pisa <pisa@cmp.felk.cvut.cz> 14 * 15 * Department of Measurement (http://meas.fel.cvut.cz/) 16 * Faculty of Electrical Engineering (http://www.fel.cvut.cz) 17 * Czech Technical University (http://www.cvut.cz/) 18 ******************************************************************************/ 19 20 #include <linux/module.h> 21 #include <linux/netdevice.h> 22 #include <linux/of.h> 23 #include <linux/platform_device.h> 24 #include <linux/pm_runtime.h> 25 26 #include "ctucanfd.h" 27 28 #define DRV_NAME "ctucanfd" 29 30 static void ctucan_platform_set_drvdata(struct device *dev, 31 struct net_device *ndev) 32 { 33 struct platform_device *pdev = container_of(dev, struct platform_device, 34 dev); 35 36 platform_set_drvdata(pdev, ndev); 37 } 38 39 /** 40 * ctucan_platform_probe - Platform registration call 41 * @pdev: Handle to the platform device structure 42 * 43 * This function does all the memory allocation and registration for the CAN 44 * device. 45 * 46 * Return: 0 on success and failure value on error 47 */ 48 static int ctucan_platform_probe(struct platform_device *pdev) 49 { 50 struct resource *res; /* IO mem resources */ 51 struct device *dev = &pdev->dev; 52 void __iomem *addr; 53 int ret; 54 unsigned int ntxbufs; 55 int irq; 56 57 /* Get the virtual base address for the device */ 58 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 59 addr = devm_ioremap_resource(dev, res); 60 if (IS_ERR(addr)) { 61 ret = PTR_ERR(addr); 62 goto err; 63 } 64 irq = platform_get_irq(pdev, 0); 65 if (irq < 0) { 66 ret = irq; 67 goto err; 68 } 69 70 /* Number of tx bufs might be change in HW for future. If so, 71 * it will be passed as property via device tree 72 */ 73 ntxbufs = 4; 74 ret = ctucan_probe_common(dev, addr, irq, ntxbufs, 0, 75 1, ctucan_platform_set_drvdata); 76 77 if (ret < 0) 78 platform_set_drvdata(pdev, NULL); 79 80 err: 81 return ret; 82 } 83 84 /** 85 * ctucan_platform_remove - Unregister the device after releasing the resources 86 * @pdev: Handle to the platform device structure 87 * 88 * This function frees all the resources allocated to the device. 89 * Return: 0 always 90 */ 91 static int ctucan_platform_remove(struct platform_device *pdev) 92 { 93 struct net_device *ndev = platform_get_drvdata(pdev); 94 struct ctucan_priv *priv = netdev_priv(ndev); 95 96 netdev_dbg(ndev, "ctucan_remove"); 97 98 unregister_candev(ndev); 99 pm_runtime_disable(&pdev->dev); 100 netif_napi_del(&priv->napi); 101 free_candev(ndev); 102 103 return 0; 104 } 105 106 static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume); 107 108 /* Match table for OF platform binding */ 109 static const struct of_device_id ctucan_of_match[] = { 110 { .compatible = "ctu,ctucanfd-2", }, 111 { .compatible = "ctu,ctucanfd", }, 112 { /* end of list */ }, 113 }; 114 MODULE_DEVICE_TABLE(of, ctucan_of_match); 115 116 static struct platform_driver ctucanfd_driver = { 117 .probe = ctucan_platform_probe, 118 .remove = ctucan_platform_remove, 119 .driver = { 120 .name = DRV_NAME, 121 .pm = &ctucan_platform_pm_ops, 122 .of_match_table = ctucan_of_match, 123 }, 124 }; 125 126 module_platform_driver(ctucanfd_driver); 127 128 MODULE_LICENSE("GPL"); 129 MODULE_AUTHOR("Martin Jerabek"); 130 MODULE_DESCRIPTION("CTU CAN FD for platform"); 131