// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
 *
 * CTU CAN FD IP Core
 *
 * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@gmail.com> FEE CTU
 * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@gmail.com> self-funded
 * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@gmail.com> FEE CTU
 * Copyright (C) 2018-2022 Pavel Pisa <pisa@cmp.felk.cvut.cz> FEE CTU/self-funded
 *
 * Project advisors:
 *     Jiri Novak <jnovak@fel.cvut.cz>
 *     Pavel Pisa <pisa@cmp.felk.cvut.cz>
 *
 * Department of Measurement         (http://meas.fel.cvut.cz/)
 * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
 * Czech Technical University        (http://www.cvut.cz/)
 ******************************************************************************/

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

#include "ctucanfd.h"

#define DRV_NAME        "ctucanfd"

static void ctucan_platform_set_drvdata(struct device *dev,
                                        struct net_device *ndev)
{
        struct platform_device *pdev = container_of(dev, struct platform_device,
                                                    dev);

        platform_set_drvdata(pdev, ndev);
}

/**
 * ctucan_platform_probe - Platform registration call
 * @pdev:       Handle to the platform device structure
 *
 * This function does all the memory allocation and registration for the CAN
 * device.
 *
 * Return: 0 on success and failure value on error
 */
static int ctucan_platform_probe(struct platform_device *pdev)
{
        struct device   *dev = &pdev->dev;
        void __iomem *addr;
        int ret;
        unsigned int ntxbufs;
        int irq;

        /* Get the virtual base address for the device */
        addr = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(addr)) {
                ret = PTR_ERR(addr);
                goto err;
        }
        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {
                ret = irq;
                goto err;
        }

        /* Number of tx bufs might be change in HW for future. If so,
         * it will be passed as property via device tree
         */
        ntxbufs = 4;
        ret = ctucan_probe_common(dev, addr, irq, ntxbufs, 0,
                                  1, ctucan_platform_set_drvdata);

        if (ret < 0)
                platform_set_drvdata(pdev, NULL);

err:
        return ret;
}

/**
 * ctucan_platform_remove - Unregister the device after releasing the resources
 * @pdev:       Handle to the platform device structure
 *
 * This function frees all the resources allocated to the device.
 * Return: 0 always
 */
static void ctucan_platform_remove(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct ctucan_priv *priv = netdev_priv(ndev);

        netdev_dbg(ndev, "ctucan_remove");

        unregister_candev(ndev);
        pm_runtime_disable(&pdev->dev);
        netif_napi_del(&priv->napi);
        free_candev(ndev);
}

static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume);

/* Match table for OF platform binding */
static const struct of_device_id ctucan_of_match[] = {
        { .compatible = "ctu,ctucanfd-2", },
        { .compatible = "ctu,ctucanfd", },
        { /* end of list */ },
};
MODULE_DEVICE_TABLE(of, ctucan_of_match);

static struct platform_driver ctucanfd_driver = {
        .probe  = ctucan_platform_probe,
        .remove = ctucan_platform_remove,
        .driver = {
                .name = DRV_NAME,
                .pm = &ctucan_platform_pm_ops,
                .of_match_table = ctucan_of_match,
        },
};

module_platform_driver(ctucanfd_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Jerabek");
MODULE_DESCRIPTION("CTU CAN FD for platform");