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https://github.com/brain-hackers/u-boot-brain
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caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <part.h>
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#include <virtio_types.h>
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#include <virtio.h>
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#include <virtio_ring.h>
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#include "virtio_blk.h"
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struct virtio_blk_priv {
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struct virtqueue *vq;
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};
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static ulong virtio_blk_do_req(struct udevice *dev, u64 sector,
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lbaint_t blkcnt, void *buffer, u32 type)
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{
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struct virtio_blk_priv *priv = dev_get_priv(dev);
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unsigned int num_out = 0, num_in = 0;
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struct virtio_sg *sgs[3];
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u8 status;
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int ret;
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struct virtio_blk_outhdr out_hdr = {
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.type = cpu_to_virtio32(dev, type),
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.sector = cpu_to_virtio64(dev, sector),
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};
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struct virtio_sg hdr_sg = { &out_hdr, sizeof(out_hdr) };
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struct virtio_sg data_sg = { buffer, blkcnt * 512 };
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struct virtio_sg status_sg = { &status, sizeof(status) };
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sgs[num_out++] = &hdr_sg;
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if (type & VIRTIO_BLK_T_OUT)
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sgs[num_out++] = &data_sg;
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else
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sgs[num_out + num_in++] = &data_sg;
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sgs[num_out + num_in++] = &status_sg;
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ret = virtqueue_add(priv->vq, sgs, num_out, num_in);
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if (ret)
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return ret;
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virtqueue_kick(priv->vq);
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while (!virtqueue_get_buf(priv->vq, NULL))
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;
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return status == VIRTIO_BLK_S_OK ? blkcnt : -EIO;
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}
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static ulong virtio_blk_read(struct udevice *dev, lbaint_t start,
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lbaint_t blkcnt, void *buffer)
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{
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return virtio_blk_do_req(dev, start, blkcnt, buffer,
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VIRTIO_BLK_T_IN);
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}
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static ulong virtio_blk_write(struct udevice *dev, lbaint_t start,
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lbaint_t blkcnt, const void *buffer)
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{
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return virtio_blk_do_req(dev, start, blkcnt, (void *)buffer,
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VIRTIO_BLK_T_OUT);
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}
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static int virtio_blk_bind(struct udevice *dev)
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{
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
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struct blk_desc *desc = dev_get_uclass_plat(dev);
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int devnum;
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desc->if_type = IF_TYPE_VIRTIO;
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/*
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* Initialize the devnum to -ENODEV. This is to make sure that
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* blk_next_free_devnum() works as expected, since the default
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* value 0 is a valid devnum.
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*/
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desc->devnum = -ENODEV;
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devnum = blk_next_free_devnum(IF_TYPE_VIRTIO);
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if (devnum < 0)
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return devnum;
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desc->devnum = devnum;
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desc->part_type = PART_TYPE_UNKNOWN;
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/*
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* virtio mmio transport supplies string identification for us,
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* while pci trnasport uses a 2-byte subvendor value.
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*/
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if (uc_priv->vendor >> 16)
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sprintf(desc->vendor, "%s", (char *)&uc_priv->vendor);
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else
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sprintf(desc->vendor, "%04x", uc_priv->vendor);
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desc->bdev = dev;
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/* Indicate what driver features we support */
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virtio_driver_features_init(uc_priv, NULL, 0, NULL, 0);
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return 0;
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}
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static int virtio_blk_probe(struct udevice *dev)
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{
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struct virtio_blk_priv *priv = dev_get_priv(dev);
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struct blk_desc *desc = dev_get_uclass_plat(dev);
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u64 cap;
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int ret;
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ret = virtio_find_vqs(dev, 1, &priv->vq);
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if (ret)
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return ret;
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desc->blksz = 512;
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desc->log2blksz = 9;
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virtio_cread(dev, struct virtio_blk_config, capacity, &cap);
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desc->lba = cap;
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return 0;
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}
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static const struct blk_ops virtio_blk_ops = {
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.read = virtio_blk_read,
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.write = virtio_blk_write,
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};
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U_BOOT_DRIVER(virtio_blk) = {
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.name = VIRTIO_BLK_DRV_NAME,
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.id = UCLASS_BLK,
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.ops = &virtio_blk_ops,
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.bind = virtio_blk_bind,
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.probe = virtio_blk_probe,
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.remove = virtio_reset,
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.priv_auto = sizeof(struct virtio_blk_priv),
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.flags = DM_FLAG_ACTIVE_DMA,
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};
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