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/platform_device.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 platform devices - User Level meta-driver"
25 
26 static bool reset_required = true;
27 module_param(reset_required, bool, 0444);
28 MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
29 
30 /* probing devices from the linux platform bus */
31 
32 static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
33 					      int num)
34 {
35 	struct platform_device *dev = (struct platform_device *) vdev->opaque;
36 	int i;
37 
38 	for (i = 0; i < dev->num_resources; i++) {
39 		struct resource *r = &dev->resource[i];
40 
41 		if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
42 			if (!num)
43 				return r;
44 
45 			num--;
46 		}
47 	}
48 	return NULL;
49 }
50 
51 static int get_platform_irq(struct vfio_platform_device *vdev, int i)
52 {
53 	struct platform_device *pdev = (struct platform_device *) vdev->opaque;
54 
55 	return platform_get_irq(pdev, i);
56 }
57 
58 static int vfio_platform_probe(struct platform_device *pdev)
59 {
60 	struct vfio_platform_device *vdev;
61 	int ret;
62 
63 	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
64 	if (!vdev)
65 		return -ENOMEM;
66 
67 	vdev->opaque = (void *) pdev;
68 	vdev->name = pdev->name;
69 	vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
70 	vdev->get_resource = get_platform_resource;
71 	vdev->get_irq = get_platform_irq;
72 	vdev->parent_module = THIS_MODULE;
73 	vdev->reset_required = reset_required;
74 
75 	ret = vfio_platform_probe_common(vdev, &pdev->dev);
76 	if (ret)
77 		kfree(vdev);
78 
79 	return ret;
80 }
81 
82 static int vfio_platform_remove(struct platform_device *pdev)
83 {
84 	struct vfio_platform_device *vdev;
85 
86 	vdev = vfio_platform_remove_common(&pdev->dev);
87 	if (vdev) {
88 		kfree(vdev);
89 		return 0;
90 	}
91 
92 	return -EINVAL;
93 }
94 
95 static struct platform_driver vfio_platform_driver = {
96 	.probe		= vfio_platform_probe,
97 	.remove		= vfio_platform_remove,
98 	.driver	= {
99 		.name	= "vfio-platform",
100 	},
101 };
102 
103 module_platform_driver(vfio_platform_driver);
104 
105 MODULE_VERSION(DRIVER_VERSION);
106 MODULE_LICENSE("GPL v2");
107 MODULE_AUTHOR(DRIVER_AUTHOR);
108 MODULE_DESCRIPTION(DRIVER_DESC);
109