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
30static 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 */
48static 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
78err:
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 */
89static 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
102static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume);
103
104/* Match table for OF platform binding */
105static const struct of_device_id ctucan_of_match[] = {
106	{ .compatible = "ctu,ctucanfd-2", },
107	{ .compatible = "ctu,ctucanfd", },
108	{ /* end of list */ },
109};
110MODULE_DEVICE_TABLE(of, ctucan_of_match);
111
112static 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
122module_platform_driver(ctucanfd_driver);
123
124MODULE_LICENSE("GPL");
125MODULE_AUTHOR("Martin Jerabek");
126MODULE_DESCRIPTION("CTU CAN FD for platform");
127