// SPDX-License-Identifier: GPL-2.0
/*
 * Generic DFL driver for Userspace I/O devicess
 *
 * Copyright (C) 2021 Intel Corporation, Inc.
 */
#include <linux/dfl.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/uio_driver.h>

#define DRIVER_NAME "uio_dfl"

static int uio_dfl_probe(struct dfl_device *ddev)
{
        struct resource *r = &ddev->mmio_res;
        struct device *dev = &ddev->dev;
        struct uio_info *uioinfo;
        struct uio_mem *uiomem;
        int ret;

        uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
        if (!uioinfo)
                return -ENOMEM;

        uioinfo->name = DRIVER_NAME;
        uioinfo->version = "0";

        uiomem = &uioinfo->mem[0];
        uiomem->memtype = UIO_MEM_PHYS;
        uiomem->addr = r->start & PAGE_MASK;
        uiomem->offs = r->start & ~PAGE_MASK;
        uiomem->size = (uiomem->offs + resource_size(r)
                        + PAGE_SIZE - 1) & PAGE_MASK;
        uiomem->name = r->name;

        /* Irq is yet to be supported */
        uioinfo->irq = UIO_IRQ_NONE;

        ret = devm_uio_register_device(dev, uioinfo);
        if (ret)
                dev_err(dev, "unable to register uio device\n");

        return ret;
}

#define FME_FEATURE_ID_ETH_GROUP        0x10
#define FME_FEATURE_ID_HSSI_SUBSYS      0x15
#define FME_FEATURE_ID_VENDOR_SPECIFIC  0x23
#define PORT_FEATURE_ID_IOPLL_USRCLK    0x14

static const struct dfl_device_id uio_dfl_ids[] = {
        { FME_ID, FME_FEATURE_ID_ETH_GROUP },
        { FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
        { FME_ID, FME_FEATURE_ID_VENDOR_SPECIFIC },
        { PORT_ID, PORT_FEATURE_ID_IOPLL_USRCLK },
        { }
};
MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);

static struct dfl_driver uio_dfl_driver = {
        .drv = {
                .name = DRIVER_NAME,
        },
        .id_table       = uio_dfl_ids,
        .probe          = uio_dfl_probe,
};
module_dfl_driver(uio_dfl_driver);

MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");