mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 13:14:27 +00:00
f4802209e5
This adds virtio block device driver support. Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
|
|
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <blk.h>
|
|
#include <dm.h>
|
|
#include <virtio_types.h>
|
|
#include <virtio.h>
|
|
#include <virtio_ring.h>
|
|
#include "virtio_blk.h"
|
|
|
|
struct virtio_blk_priv {
|
|
struct virtqueue *vq;
|
|
};
|
|
|
|
static ulong virtio_blk_do_req(struct udevice *dev, u64 sector,
|
|
lbaint_t blkcnt, void *buffer, u32 type)
|
|
{
|
|
struct virtio_blk_priv *priv = dev_get_priv(dev);
|
|
unsigned int num_out = 0, num_in = 0;
|
|
struct virtio_sg *sgs[3];
|
|
u8 status;
|
|
int ret;
|
|
|
|
struct virtio_blk_outhdr out_hdr = {
|
|
.type = cpu_to_virtio32(dev, type),
|
|
.sector = cpu_to_virtio64(dev, sector),
|
|
};
|
|
struct virtio_sg hdr_sg = { &out_hdr, sizeof(out_hdr) };
|
|
struct virtio_sg data_sg = { buffer, blkcnt * 512 };
|
|
struct virtio_sg status_sg = { &status, sizeof(status) };
|
|
|
|
sgs[num_out++] = &hdr_sg;
|
|
|
|
if (type & VIRTIO_BLK_T_OUT)
|
|
sgs[num_out++] = &data_sg;
|
|
else
|
|
sgs[num_out + num_in++] = &data_sg;
|
|
|
|
sgs[num_out + num_in++] = &status_sg;
|
|
|
|
ret = virtqueue_add(priv->vq, sgs, num_out, num_in);
|
|
if (ret)
|
|
return ret;
|
|
|
|
virtqueue_kick(priv->vq);
|
|
|
|
while (!virtqueue_get_buf(priv->vq, NULL))
|
|
;
|
|
|
|
return status == VIRTIO_BLK_S_OK ? blkcnt : -EIO;
|
|
}
|
|
|
|
static ulong virtio_blk_read(struct udevice *dev, lbaint_t start,
|
|
lbaint_t blkcnt, void *buffer)
|
|
{
|
|
return virtio_blk_do_req(dev, start, blkcnt, buffer,
|
|
VIRTIO_BLK_T_IN);
|
|
}
|
|
|
|
static ulong virtio_blk_write(struct udevice *dev, lbaint_t start,
|
|
lbaint_t blkcnt, const void *buffer)
|
|
{
|
|
return virtio_blk_do_req(dev, start, blkcnt, (void *)buffer,
|
|
VIRTIO_BLK_T_OUT);
|
|
}
|
|
|
|
static int virtio_blk_bind(struct udevice *dev)
|
|
{
|
|
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
|
|
struct blk_desc *desc = dev_get_uclass_platdata(dev);
|
|
int devnum;
|
|
|
|
desc->if_type = IF_TYPE_VIRTIO;
|
|
/*
|
|
* Initialize the devnum to -ENODEV. This is to make sure that
|
|
* blk_next_free_devnum() works as expected, since the default
|
|
* value 0 is a valid devnum.
|
|
*/
|
|
desc->devnum = -ENODEV;
|
|
devnum = blk_next_free_devnum(IF_TYPE_VIRTIO);
|
|
if (devnum < 0)
|
|
return devnum;
|
|
desc->devnum = devnum;
|
|
desc->part_type = PART_TYPE_UNKNOWN;
|
|
/*
|
|
* virtio mmio transport supplies string identification for us,
|
|
* while pci trnasport uses a 2-byte subvendor value.
|
|
*/
|
|
if (uc_priv->vendor >> 16)
|
|
sprintf(desc->vendor, "%s", (char *)&uc_priv->vendor);
|
|
else
|
|
sprintf(desc->vendor, "%04x", uc_priv->vendor);
|
|
desc->bdev = dev;
|
|
|
|
/* Indicate what driver features we support */
|
|
virtio_driver_features_init(uc_priv, NULL, 0, NULL, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_blk_probe(struct udevice *dev)
|
|
{
|
|
struct virtio_blk_priv *priv = dev_get_priv(dev);
|
|
struct blk_desc *desc = dev_get_uclass_platdata(dev);
|
|
u64 cap;
|
|
int ret;
|
|
|
|
ret = virtio_find_vqs(dev, 1, &priv->vq);
|
|
if (ret)
|
|
return ret;
|
|
|
|
desc->blksz = 512;
|
|
virtio_cread(dev, struct virtio_blk_config, capacity, &cap);
|
|
desc->lba = cap;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct blk_ops virtio_blk_ops = {
|
|
.read = virtio_blk_read,
|
|
.write = virtio_blk_write,
|
|
};
|
|
|
|
U_BOOT_DRIVER(virtio_blk) = {
|
|
.name = VIRTIO_BLK_DRV_NAME,
|
|
.id = UCLASS_BLK,
|
|
.ops = &virtio_blk_ops,
|
|
.bind = virtio_blk_bind,
|
|
.probe = virtio_blk_probe,
|
|
.remove = virtio_reset,
|
|
.priv_auto_alloc_size = sizeof(struct virtio_blk_priv),
|
|
.flags = DM_FLAG_ACTIVE_DMA,
|
|
};
|