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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 | ||
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"); |