[U-Boot] [PATCH v3 06/31] virtio: Add virtio over mmio transport driver

[sjg at google.com]

VirtIO can use various different buses and virtio devices are
commonly implemented as PCI devices. But virtual environments
without PCI support (a common situation in embedded devices
models) might use simple memory mapped device (“virtio-mmio”)
instead of the PCI device.

This adds a transport driver that implements UCLASS_VIRTIO for
virtio over mmio.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi>
Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---

Changes in v3: None
Changes in v2: None

 drivers/virtio/Kconfig       |   7 +
 drivers/virtio/Makefile      |   1 +
 drivers/virtio/virtio_mmio.c | 413 +++++++++++++++++++++++++++++++++++++++++++
 drivers/virtio/virtio_mmio.h | 129 ++++++++++++++
 4 files changed, 550 insertions(+)
 create mode 100644 drivers/virtio/virtio_mmio.c
 create mode 100644 drivers/virtio/virtio_mmio.h

Applied to u-boot-dm/next, thanks!