107 строки
2.3 KiB
C
107 строки
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2013 - Virtual Open Systems
|
|
* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vfio.h>
|
|
#include <linux/amba/bus.h>
|
|
|
|
#include "vfio_platform_private.h"
|
|
|
|
#define DRIVER_VERSION "0.10"
|
|
#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
|
|
#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
|
|
|
|
/* probing devices from the AMBA bus */
|
|
|
|
static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
|
|
int i)
|
|
{
|
|
struct amba_device *adev = (struct amba_device *) vdev->opaque;
|
|
|
|
if (i == 0)
|
|
return &adev->res;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int get_amba_irq(struct vfio_platform_device *vdev, int i)
|
|
{
|
|
struct amba_device *adev = (struct amba_device *) vdev->opaque;
|
|
int ret = 0;
|
|
|
|
if (i < AMBA_NR_IRQS)
|
|
ret = adev->irq[i];
|
|
|
|
/* zero is an unset IRQ for AMBA devices */
|
|
return ret ? ret : -ENXIO;
|
|
}
|
|
|
|
static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
|
|
{
|
|
struct vfio_platform_device *vdev;
|
|
int ret;
|
|
|
|
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
|
|
if (!vdev)
|
|
return -ENOMEM;
|
|
|
|
vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
|
|
if (!vdev->name) {
|
|
kfree(vdev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vdev->opaque = (void *) adev;
|
|
vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
|
|
vdev->get_resource = get_amba_resource;
|
|
vdev->get_irq = get_amba_irq;
|
|
vdev->parent_module = THIS_MODULE;
|
|
vdev->reset_required = false;
|
|
|
|
ret = vfio_platform_probe_common(vdev, &adev->dev);
|
|
if (ret) {
|
|
kfree(vdev->name);
|
|
kfree(vdev);
|
|
return ret;
|
|
}
|
|
|
|
dev_set_drvdata(&adev->dev, vdev);
|
|
return 0;
|
|
}
|
|
|
|
static void vfio_amba_remove(struct amba_device *adev)
|
|
{
|
|
struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
|
|
|
|
vfio_platform_remove_common(vdev);
|
|
kfree(vdev->name);
|
|
kfree(vdev);
|
|
}
|
|
|
|
static const struct amba_id pl330_ids[] = {
|
|
{ 0, 0 },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(amba, pl330_ids);
|
|
|
|
static struct amba_driver vfio_amba_driver = {
|
|
.probe = vfio_amba_probe,
|
|
.remove = vfio_amba_remove,
|
|
.id_table = pl330_ids,
|
|
.drv = {
|
|
.name = "vfio-amba",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_amba_driver(vfio_amba_driver);
|
|
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|