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
uio_dfl_probe(struct dfl_device * ddev)14 static 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
49 static const struct dfl_device_id uio_dfl_ids[] = {
50 { FME_ID, FME_FEATURE_ID_ETH_GROUP },
51 { }
52 };
53 MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
54
55 static struct dfl_driver uio_dfl_driver = {
56 .drv = {
57 .name = DRIVER_NAME,
58 },
59 .id_table = uio_dfl_ids,
60 .probe = uio_dfl_probe,
61 };
62 module_dfl_driver(uio_dfl_driver);
63
64 MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
65 MODULE_AUTHOR("Intel Corporation");
66 MODULE_LICENSE("GPL v2");
67
