LXR linux/drivers/vfio/platform/vfio

   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        vdev->reset_required = false;
  72
  73        ret = vfio_platform_probe_common(vdev, &adev->dev);
  74        if (ret) {
  75                kfree(vdev->name);
  76                kfree(vdev);
  77        }
  78
  79        return ret;
  80}
  81
  82static int vfio_amba_remove(struct amba_device *adev)
  83{
  84        struct vfio_platform_device *vdev;
  85
  86        vdev = vfio_platform_remove_common(&adev->dev);
  87        if (vdev) {
  88                kfree(vdev->name);
  89                kfree(vdev);
  90                return 0;
  91        }
  92
  93        return -EINVAL;
  94}
  95
  96static const struct amba_id pl330_ids[] = {
  97        { 0, 0 },
  98};
  99
 100MODULE_DEVICE_TABLE(amba, pl330_ids);
 101
 102static struct amba_driver vfio_amba_driver = {
 103        .probe = vfio_amba_probe,
 104        .remove = vfio_amba_remove,
 105        .id_table = pl330_ids,
 106        .drv = {
 107                .name = "vfio-amba",
 108                .owner = THIS_MODULE,
 109        },
 110};
 111
 112module_amba_driver(vfio_amba_driver);
 113
 114MODULE_VERSION(DRIVER_VERSION);
 115MODULE_LICENSE("GPL v2");
 116MODULE_AUTHOR(DRIVER_AUTHOR);
 117MODULE_DESCRIPTION(DRIVER_DESC);
 118