1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Generic DFL driver for Userspace I/O devicess
 4 *
 5 * Copyright (C) 2021 Intel Corporation, Inc.
 6 */
 7#include <linux/dfl.h>
 8#include <linux/errno.h>
 9#include <linux/module.h>
10#include <linux/uio_driver.h>
11
12#define DRIVER_NAME "uio_dfl"
13
14static int uio_dfl_probe(struct dfl_device *ddev)
15{
16	struct resource *r = &ddev->mmio_res;
17	struct device *dev = &ddev->dev;
18	struct uio_info *uioinfo;
19	struct uio_mem *uiomem;
20	int ret;
21
22	uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
23	if (!uioinfo)
24		return -ENOMEM;
25
26	uioinfo->name = DRIVER_NAME;
27	uioinfo->version = "0";
28
29	uiomem = &uioinfo->mem[0];
30	uiomem->memtype = UIO_MEM_PHYS;
31	uiomem->addr = r->start & PAGE_MASK;
32	uiomem->offs = r->start & ~PAGE_MASK;
33	uiomem->size = (uiomem->offs + resource_size(r)
34			+ PAGE_SIZE - 1) & PAGE_MASK;
35	uiomem->name = r->name;
36
37	/* Irq is yet to be supported */
38	uioinfo->irq = UIO_IRQ_NONE;
39
40	ret = devm_uio_register_device(dev, uioinfo);
41	if (ret)
42		dev_err(dev, "unable to register uio device\n");
43
44	return ret;
45}
46
47#define FME_FEATURE_ID_ETH_GROUP	0x10
48#define FME_FEATURE_ID_HSSI_SUBSYS	0x15
49#define PORT_FEATURE_ID_IOPLL_USRCLK	0x14
50
51static const struct dfl_device_id uio_dfl_ids[] = {
52	{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
53	{ FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
54	{ PORT_ID, PORT_FEATURE_ID_IOPLL_USRCLK },
55	{ }
56};
57MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
58
59static struct dfl_driver uio_dfl_driver = {
60	.drv = {
61		.name = DRIVER_NAME,
62	},
63	.id_table	= uio_dfl_ids,
64	.probe		= uio_dfl_probe,
65};
66module_dfl_driver(uio_dfl_driver);
67
68MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
69MODULE_AUTHOR("Intel Corporation");
70MODULE_LICENSE("GPL v2");