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 device *dev = &pdev->dev; 51 void __iomem *addr; 52 int ret; 53 unsigned int ntxbufs; 54 int irq; 55 56 /* Get the virtual base address for the device */ 57 addr = devm_platform_ioremap_resource(pdev, 0); 58 if (IS_ERR(addr)) { 59 ret = PTR_ERR(addr); 60 goto err; 61 } 62 irq = platform_get_irq(pdev, 0); 63 if (irq < 0) { 64 ret = irq; 65 goto err; 66 } 67 68 /* Number of tx bufs might be change in HW for future. If so, 69 * it will be passed as property via device tree 70 */ 71 ntxbufs = 4; 72 ret = ctucan_probe_common(dev, addr, irq, ntxbufs, 0, 73 1, ctucan_platform_set_drvdata); 74 75 if (ret < 0) 76 platform_set_drvdata(pdev, NULL); 77 78 err: 79 return ret; 80 } 81 82 /** 83 * ctucan_platform_remove - Unregister the device after releasing the resources 84 * @pdev: Handle to the platform device structure 85 * 86 * This function frees all the resources allocated to the device. 87 * Return: 0 always 88 */ 89 static void ctucan_platform_remove(struct platform_device *pdev) 90 { 91 struct net_device *ndev = platform_get_drvdata(pdev); 92 struct ctucan_priv *priv = netdev_priv(ndev); 93 94 netdev_dbg(ndev, "ctucan_remove"); 95 96 unregister_candev(ndev); 97 pm_runtime_disable(&pdev->dev); 98 netif_napi_del(&priv->napi); 99 free_candev(ndev); 100 } 101 102 static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume); 103 104 /* Match table for OF platform binding */ 105 static const struct of_device_id ctucan_of_match[] = { 106 { .compatible = "ctu,ctucanfd-2", }, 107 { .compatible = "ctu,ctucanfd", }, 108 { /* end of list */ }, 109 }; 110 MODULE_DEVICE_TABLE(of, ctucan_of_match); 111 112 static struct platform_driver ctucanfd_driver = { 113 .probe = ctucan_platform_probe, 114 .remove_new = ctucan_platform_remove, 115 .driver = { 116 .name = DRV_NAME, 117 .pm = &ctucan_platform_pm_ops, 118 .of_match_table = ctucan_of_match, 119 }, 120 }; 121 122 module_platform_driver(ctucanfd_driver); 123 124 MODULE_LICENSE("GPL"); 125 MODULE_AUTHOR("Martin Jerabek"); 126 MODULE_DESCRIPTION("CTU CAN FD for platform"); 127