tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2013 - Virtual Open Systems
3 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/vfio.h>
18#include <linux/amba/bus.h>
19
20#include "vfio_platform_private.h"
21
22#define DRIVER_VERSION "0.10"
23#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
24#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
25
26/* probing devices from the AMBA bus */
27
28static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
29 int i)
30{
31 struct amba_device *adev = (struct amba_device *) vdev->opaque;
32
33 if (i == 0)
34 return &adev->res;
35
36 return NULL;
37}
38
39static int get_amba_irq(struct vfio_platform_device *vdev, int i)
40{
41 struct amba_device *adev = (struct amba_device *) vdev->opaque;
42 int ret = 0;
43
44 if (i < AMBA_NR_IRQS)
45 ret = adev->irq[i];
46
47 /* zero is an unset IRQ for AMBA devices */
48 return ret ? ret : -ENXIO;
49}
50
51static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
52{
53 struct vfio_platform_device *vdev;
54 int ret;
55
56 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
57 if (!vdev)
58 return -ENOMEM;
59
60 vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
61 if (!vdev->name) {
62 kfree(vdev);
63 return -ENOMEM;
64 }
65
66 vdev->opaque = (void *) adev;
67 vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
68 vdev->get_resource = get_amba_resource;
69 vdev->get_irq = get_amba_irq;
70 vdev->parent_module = THIS_MODULE;
71
72 ret = vfio_platform_probe_common(vdev, &adev->dev);
73 if (ret) {
74 kfree(vdev->name);
75 kfree(vdev);
76 }
77
78 return ret;
79}
80
81static int vfio_amba_remove(struct amba_device *adev)
82{
83 struct vfio_platform_device *vdev;
84
85 vdev = vfio_platform_remove_common(&adev->dev);
86 if (vdev) {
87 kfree(vdev->name);
88 kfree(vdev);
89 return 0;
90 }
91
92 return -EINVAL;
93}
94
95static struct amba_id pl330_ids[] = {
96 { 0, 0 },
97};
98
99MODULE_DEVICE_TABLE(amba, pl330_ids);
100
101static struct amba_driver vfio_amba_driver = {
102 .probe = vfio_amba_probe,
103 .remove = vfio_amba_remove,
104 .id_table = pl330_ids,
105 .drv = {
106 .name = "vfio-amba",
107 .owner = THIS_MODULE,
108 },
109};
110
111module_amba_driver(vfio_amba_driver);
112
113MODULE_VERSION(DRIVER_VERSION);
114MODULE_LICENSE("GPL v2");
115MODULE_AUTHOR(DRIVER_AUTHOR);
116MODULE_DESCRIPTION(DRIVER_DESC);