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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*
* VirtIO Sandbox transport driver, for testing purpose only
*/
#include <dm.h>
#include <virtio_types.h>
#include <virtio.h>
#include <virtio_ring.h>
#include <linux/bug.h>
#include <linux/compat.h>
#include <linux/err.h>
#include <linux/io.h>
struct virtio_sandbox_priv {
u8 id;
u8 status;
u64 device_features;
u64 driver_features;
ulong queue_desc;
ulong queue_available;
ulong queue_used;
};
static int virtio_sandbox_get_config(struct udevice *udev, unsigned int offset,
void *buf, unsigned int len)
{
return 0;
}
static int virtio_sandbox_set_config(struct udevice *udev, unsigned int offset,
const void *buf, unsigned int len)
{
return 0;
}
static int virtio_sandbox_get_status(struct udevice *udev, u8 *status)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
*status = priv->status;
return 0;
}
static int virtio_sandbox_set_status(struct udevice *udev, u8 status)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
/* We should never be setting status to 0 */
WARN_ON(status == 0);
priv->status = status;
return 0;
}
static int virtio_sandbox_reset(struct udevice *udev)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
/* 0 status means a reset */
priv->status = 0;
return 0;
}
static int virtio_sandbox_get_features(struct udevice *udev, u64 *features)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
*features = priv->device_features;
return 0;
}
static int virtio_sandbox_set_features(struct udevice *udev)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
priv->driver_features = uc_priv->features;
return 0;
}
static struct virtqueue *virtio_sandbox_setup_vq(struct udevice *udev,
unsigned int index)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
struct virtqueue *vq;
ulong addr;
int err;
/* Create the vring */
vq = vring_create_virtqueue(index, 4, 4096, udev);
if (!vq) {
err = -ENOMEM;
goto error_new_virtqueue;
}
addr = virtqueue_get_desc_addr(vq);
priv->queue_desc = addr;
addr = virtqueue_get_avail_addr(vq);
priv->queue_available = addr;
addr = virtqueue_get_used_addr(vq);
priv->queue_used = addr;
return vq;
error_new_virtqueue:
return ERR_PTR(err);
}
static void virtio_sandbox_del_vq(struct virtqueue *vq)
{
vring_del_virtqueue(vq);
}
static int virtio_sandbox_del_vqs(struct udevice *udev)
{
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
struct virtqueue *vq, *n;
list_for_each_entry_safe(vq, n, &uc_priv->vqs, list)
virtio_sandbox_del_vq(vq);
return 0;
}
static int virtio_sandbox_find_vqs(struct udevice *udev, unsigned int nvqs,
struct virtqueue *vqs[])
{
int i;
for (i = 0; i < nvqs; ++i) {
vqs[i] = virtio_sandbox_setup_vq(udev, i);
if (IS_ERR(vqs[i])) {
virtio_sandbox_del_vqs(udev);
return PTR_ERR(vqs[i]);
}
}
return 0;
}
static int virtio_sandbox_notify(struct udevice *udev, struct virtqueue *vq)
{
return 0;
}
static int virtio_sandbox_probe(struct udevice *udev)
{
struct virtio_sandbox_priv *priv = dev_get_priv(udev);
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
/* fake some information for testing */
priv->device_features = BIT_ULL(VIRTIO_F_VERSION_1);
uc_priv->device = dev_read_u32_default(udev, "virtio-type",
VIRTIO_ID_RNG);
uc_priv->vendor = ('u' << 24) | ('b' << 16) | ('o' << 8) | 't';
return 0;
}
static const struct dm_virtio_ops virtio_sandbox1_ops = {
.get_config = virtio_sandbox_get_config,
.set_config = virtio_sandbox_set_config,
.get_status = virtio_sandbox_get_status,
.set_status = virtio_sandbox_set_status,
.reset = virtio_sandbox_reset,
.get_features = virtio_sandbox_get_features,
.set_features = virtio_sandbox_set_features,
.find_vqs = virtio_sandbox_find_vqs,
.del_vqs = virtio_sandbox_del_vqs,
.notify = virtio_sandbox_notify,
};
static const struct udevice_id virtio_sandbox1_ids[] = {
{ .compatible = "sandbox,virtio1" },
{ }
};
U_BOOT_DRIVER(virtio_sandbox1) = {
.name = "virtio-sandbox1",
.id = UCLASS_VIRTIO,
.of_match = virtio_sandbox1_ids,
.ops = &virtio_sandbox1_ops,
.probe = virtio_sandbox_probe,
.priv_auto = sizeof(struct virtio_sandbox_priv),
};
/* this one without notify op */
static const struct dm_virtio_ops virtio_sandbox2_ops = {
.get_config = virtio_sandbox_get_config,
.set_config = virtio_sandbox_set_config,
.get_status = virtio_sandbox_get_status,
.set_status = virtio_sandbox_set_status,
.reset = virtio_sandbox_reset,
.get_features = virtio_sandbox_get_features,
.set_features = virtio_sandbox_set_features,
.find_vqs = virtio_sandbox_find_vqs,
.del_vqs = virtio_sandbox_del_vqs,
};
static const struct udevice_id virtio_sandbox2_ids[] = {
{ .compatible = "sandbox,virtio2" },
{ }
};
U_BOOT_DRIVER(virtio_sandbox2) = {
.name = "virtio-sandbox2",
.id = UCLASS_VIRTIO,
.of_match = virtio_sandbox2_ids,
.ops = &virtio_sandbox2_ops,
.probe = virtio_sandbox_probe,
.priv_auto = sizeof(struct virtio_sandbox_priv),
};
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