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// 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;
}
static int vfio_amba_remove(struct amba_device *adev)
{
struct vfio_platform_device *vdev;
vdev = vfio_platform_remove_common(&adev->dev);
if (vdev) {
kfree(vdev->name);
kfree(vdev);
return 0;
}
return -EINVAL;
}
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);
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